Showing papers on "Illumination angle published in 2010"

Multi-angle lensless digital holography for depth resolved imaging on a chip

Abstract: A multi-angle lensfree holographic imaging platform that can accurately characterize both the axial and lateral positions of cells located within multi-layered micro-channels is introduced. In this platform, lensfree digital holograms of the micro-objects on the chip are recorded at different illumination angles using partially coherent illumination. These digital holograms start to shift laterally on the sensor plane as the illumination angle of the source is tilted. Since the exact amount of this lateral shift of each object hologram can be calculated with an accuracy that beats the diffraction limit of light, the height of each cell from the substrate can be determined over a large field of view without the use of any lenses. We demonstrate the proof of concept of this multi-angle lensless imaging platform by using light emitting diodes to characterize various sized microparticles located on a chip with sub-micron axial and lateral localization over ~60 mm2 field of view. Furthermore, we successfully apply this lensless imaging approach to simultaneously characterize blood samples located at multi-layered micro-channels in terms of the counts, individual thicknesses and the volumes of the cells at each layer. Because this platform does not require any lenses, lasers or other bulky optical/mechanical components, it provides a compact and high-throughput alternative to conventional approaches for cytometry and diagnostics applications involving lab on a chip systems.

Plasmonic cloaking for irregular objects with anisotropic scattering properties.

Abstract: Here we extend the plasmonic cloaking technique to irregularly shaped objects with anisotropic scattering response. The scattering-cancellation approach to cloaking [A. Alu and N. Engheta, Phys. Rev. E 72, 016623 (2005)] has been extensively applied in the past to symmetrical geometries and canonical shapes. However, recent papers have raised some doubts concerning the fact that its use may not be as effective when dealing with strongly anisotropic and noncanonical geometries. Our goal here is to extend the plasmonic cloaking technique to irregular obstacles and to show that proper cloak design may provide a significant and uniform scattering reduction, independent of angle of incidence, position, and polarization of the illumination. We investigate how the volumetric effect of scattering cancellation provided by plasmonic media may drastically suppress the scattering for these irregular geometries independent of the illumination angle, and we shed some light on the physical mechanisms and the design rules at the basis of this cloaking technique when applied to objects whose scattering properties are dependent upon polarization and angle of incidence.

Anisotropic reflectance from turbid media. II. Measurements.

Abstract: The anisotropic reflectance from turbid media predicted using the radiative transfer based DORT2002 model is experimentally verified through goniophotometric measurements. A set of paper samples with varying amounts of dye and thickness is prepared, and their angle resolved reflectance is measured. An alleged perfect diffusor is also included. The corresponding simulations are performed. A complete agreement between the measurements and model predictions is seen regarding the characteristics of the anisotropy. They show that relatively more light is reflected at large polar angles when the absorption or illumination angle is increased or when the medium thickness is decreased. This is due to the relative amount of near-surface bulk scattering increasing in these cases. This affects the application of the Kubelka–Munk model as well as standards for reflectance measurements and calibration routines.

Multiplexed biometric imaging

Abstract: Some embodiments of the present invention disclose systems and methods for a multiplexed multispectral imaging, object discrimination, background discrimination, and/or object identification. In some embodiments, a multispectral sensor is provided that includes at least two illumination sources and an imager with a color filter array. The two illumination sources can illuminate a platen with light having distinct illumination angles as well as distinct characteristics, such as distinct wavelengths or wavelength bands and/or distinct polarization conditions. The color filter array, which may be integral with the imager or separate therefrom, can filter light based on the specific distinctions between the two illumination sources. A single image of an object at the platen can be acquired. Individual pixels of the image will then be highly associated with one or the other illumination source. Because of the filtering by the color filter array, this image will include information about the illumination angle.

Micropatterned single lens for wide-angle light-emitting diodes.

Abstract: This work presents a simple and effective method for a wide-angle light-emitting diode module by using a single lens corrugated with micropattern arrays. Impinged onto the micropattern arrays of a curved surface, light undergoes an enhancement of the illumination angle due to omnidirectional diffraction. A hemispherical dome lens with micropattern arrays is microfabricated by a reconfigurable microtemplating and a replica molding method. Depending on the micropattern size, the experimental and simulation results show the micropatterned single lens has the wide illumination angle as well as the high extraction efficiency of an incoming LED light source, compared with a conventional dome lens.

Illumination optics for euv microlithography and related system and apparatus

Abstract: An illumination optics for EUV microlithography guides an illumination light bundle from a radiation source to an object field with an extension ratio between a longer field dimension and a shorter field dimension, where the ratio is considerably greater than 1. A field facet mirror has a plurality of field facets that set defined illumination conditions in the object field. A following optics downstream of the field facet mirror transmits the illumination light into the object field. The following optics includes a pupil facet mirror with a plurality of pupil facets. The field facets are in each case individually allocated to the pupil facets so that portions of the illumination light bundle impinging upon in each case one of the field facets are guided on to the object field via the associated pupil facet. The field facet mirror not only includes a plurality of basic illumination field facets which provide a basic illumination of the object field via associated basic illumination pupil facets, but also includes a plurality of correction illumination field facets which provide for a correction of the illumination of the object field via associated correction illumination pupil facets. The result is an illumination optics which allows unwanted variations of illumination parameters, for instance an illumination intensity distribution or an illumination angle distribution, to be corrected across the object field.

Intelligent high speed ball with built-in and variable angle infrared illumination system

Abstract: The invention provides an intelligent high-speed ball with a built-in variable-angle infrared illumination system, which belongs to the field of optical, mechanical and electronic integration and relates to an infrared intelligent high-speed ball used in the field of security monitoring. The built-in variable-angle infrared illumination system is a light source component synchronized with the continuous adjustable focus of a high-speed ball, and by changing the distance between an infrared light source and a condenser group, the change of an infrared illumination angle is realized, and the real-time tracking effect and the optimal imaging effect of the infrared illumination and the continuous adjustable focus of the high-speed ball are realized. The invention reduces the number of used intelligent high-speed ball infrared lamps capable of being used at night and in daylight, reduces power consumption value, cost and volume, saves energy, and protects environment.

Method of imaging a target area of the subsoil from walkaway type data

Abstract: A method of imaging a target area of the subsoil from “walkaway” data having application to development of oil reservoirs or monitoring of geologic storage sites is disclosed. After acquisition of seismic data of walkaway type and estimation of the rate of propagation of the seismic waves in the subsoil, p illumination angles are selected. The seismic measurements are then converted to data D p by illumination angle. The distribution of acoustic impedances best explaining data D p is determined within the target by using a non-linear inversion which minimizes a difference between the data D p obtained from measurements and data by illumination angle resulting from an estimation. This estimation is performed by solving a wave propagation equation from the velocity field, an acoustic impedance distribution and a pressure distribution at the level of the top of the target for each illumination angle.

Endoscope system, endoscope, and method for measuring distance and illumination angle

Abstract: An endoscope (10) has a first light guide (22c) for transmitting measurement light from a light source (12) and a second light guide (22b) for transmitting IR light from an IR light source (12), and a CCD (24a, 24b) for capturing a projected shape of the measurement light. An image processing circuit (34a, 34b) extracts the projected shape from an image from the CCD, and calculates the size of the extracted projected shape to calculate a distance between an end surface (25) of the endoscope and an object of interest and an illumination angle of the IR light on a surface of the object of interest. A CPU (30) controls the operation of the IR light source in accordance with the calculated distance and the illumination angle.

Wide-Angle Wavefront Reconstruction Near Display Plane in Three-Dimensional Display System

Abstract: An enlargement method of reconstruction angle by time-sharing tilted illumination in a three-dimensional (3D) display system based on wavefront modulation is presented. In a recording system, an array of phase-shifting interferometer is used for recording the wavefront data from 3D object in wide angle. In a reconstruction system, single display device such as spatial light modulator is illuminated with tilted plane waves for wide angle reconstruction. Tilted illumination causes the spatial shift of reconstructed 3D object according to the illumination angle. We propose a method to reduce the spatial shift by changing the reconstruction position around display plane. Experimental and numerical results are presented.

Multi-side type LED light source

Abstract: The utility model relates to a multi-side type LED light source, comprising a hollow pipe body, a plurality of LED chips and a colloid unit, wherein the hollow pipe body is made of conducting material, the peripheral surface of the hollow pipe body at least forms three pairs of symmetrical mounting surfaces, and each mounting surface is provided with a positive wire and a negative wire; the plurality of LED chips are arranged on the mounting surface and are electrically connected with the positive wire and the negative wire; and the colloid unit is coated on the LED chip so as to form a multi-side type light-emitting LED light pole. The multi-side type LED light source has an omni-bearing illumination angle so as to improve the problem that the LED illumination light has directivity, reduce illumination dead angle and improve the effect of uniformity of the LED light source; in addition, the LED chips are directly arranged on a heat-conducting hollow pipe body, thus not only simplifying the process, but also having radiating effect simultaneously, and further prolonging the service life of the LED; and all the LED lamp poles can be connected in series according to the requirements, so as to be extended to preset length and achieve the effects of modularized assembly and expansion of use field.

Indoor intelligent lighting illumination system

Abstract: The invention relates to an indoor intelligent lighting illumination system, which comprises an electric shutter, an illumination light, a light angle sensor, a light illumination intensity sensor and a controller, wherein the light angle sensor is used for sensing the light illumination angle; the light illumination intensity sensor is used for sensing the light illumination intensity; and the controller is used for controlling an opening-and-closing angle of the electric shutter and the operation of the illumination light according to the light illumination angle sensed by the light angle sensor and the light illumination intensity sensed by the light illumination intensity sensor. The indoor intelligent lighting illumination system can control the opening-and-closing angle of the electric shutter and the operation of the illumination light, so as to provide the most suitable lighting and illuminating effect for indoor condition based on environment and be beneficial for protecting the indoor room of people; in addition, the system can also reasonably utilize power supply to the maximum extent, so as to avoid the waste of the power supply.

Optical illumination module

Abstract: An optical illumination module is disclosed, including a fixed light source and a planar convex lens; the fixed light source is LED; the planar convex lens is a rotation-symmetric non-spherical surface and is disposed in a light axial direction of the fixed light source at a certain distance between 13.5mm to 16mm from the fixed light source, the planar end thereof is the incident surface and the convex end thereof is a light exiting surface. When the fixed light source is located at the coordinate origin, the curve line of convex surface of the planar convex lens is composed by serially connecting the points having the following coordinates with respect to the origin : (12,8.00), (11,8.05), (10,8.20), (9,8.44), (8,8.79),,(7,9.25), (6,9.82), (5,10.51), (4,11.33), (3,12.29), (2,13.42), (1,14.75), (0,16.30), (-1,14.75), (-2,13.42), (-3,12.29), (-4,11.33), (-5,10.51), (-6,9.82), (-7,9.25), (-8,8.79), (-9,8.44), (-10,8.20), (-11,8.05), (-12,8.00); so that when the planar convex lens is moved within the certain distance, the fixed light source can project light at an illumination angle as small as possible so as to enhance the illumination intensity and distance.

Multiplexed biometric imaging and dual-imager biometric sensor

Abstract: Some embodiments disclose systems and methods for a multiplexed multispectral imaging, object discrimination, background discrimination, and/or object identification. In some embodiments, a multispectral sensor is provided that includes at least two illumination sources and an imager with a color filter array. The two illumination sources can illuminate a platen with light having distinct illumination angles and distinct characteristics. The color filter array, which may be integral with the imager or separate therefrom, can filter light based on specific distinctions between the two illumination sources. A single image of an object at the platen can be acquired. Individual pixels of the image will then be highly associated with one or the other illumination source. Because of the filtering by the color filter array, this image will include information about the illumination angle. Some embodiments disclose a dual-imager biometric sensor. The two imagers may include a direct imager and a TIR imager.

Large-angle LED illuminating device

Abstract: The invention provides a large-angle LED illuminating device, which consists of a lampshade, a printed circuit board, LED lamps and a heat dissipation column, wherein the lampshade comprises an outer cover and a diffuser; the printed circuit board is welded with the LED lamps into a whole; the LED lamps are distributed in an annular array by taking the centre of a circle of the printed circuit board as a center; the LED lamps are welded on the upper surface and the lower surface of the printed circuit board or welded on the upper surface or the lower surface of the printed circuit board; the heat dissipation column is fixedly or movably connected with the printed circuit board; and angles of the LED lamps and the printed circuit board are between 20 and 170 DEG. Maximum irradiation angle of light is expanded to 290 DEG by different angles and arrangement scheme of the LED lamps on a light source board so as to achieve the effects of increasing the whole LED light source angle and uniformly illuminating. The device solves the technical problems of small illumination angle and complicated structure of the prior light source, and is simple in production technology and convenient to assemble.

Optical section imaging of the tilted planes by illumination-angle-scanning digital interference holography.

Abstract: A new method of optical imaging that can generate the section images of arbitrarily tilted planes has been developed from illumination-angle-scanning digital interference holography. A set of complex object fields are reconstructed from the holograms captured as the illumination angle is varied with uniform intervals. After the complex fields are modified with phase ramps that match the tilt (relative to the hologram plane) of a desired observation plane, the image of the object sliced along the tilted plane is obtained from their superposition. The axial resolution of a system employing this method is measured with a step height standard, and it is applied to the tomographic inspection of a microelectromechanical system.

Tilt scanning interferometry: a 3D k-space representation for depth-resolved structure and displacement measurement in scattering materials

Abstract: Tilt Scanning Interferometry (TSI) has been recently developed as an experimental method to measure multi-component displacement fields inside the volume of semitransparent scattering materials. It can be considered as an extension of speckle interferometry in 3D, in which the illumination angle is tilted to provide depth information, or as an optical diffraction tomography technique with phase detection. It relies on phase measurements to extract the displacement information, as in the usual 2D counterparts. A numerical model to simulate the speckle fields recorded in TSI has been recently developed to enable the study on how the phase and amplitude are affected by factors such as refraction, absorption, scattering, dispersion, stress-optic coupling and spatial variations of the refractive index, all of which may lead to spurious displacements. In order to extract depth-resolved structure and phase information from TSI data, the approach had been to use Fourier Transformation of the intensity modulation signal along the illumination angle axis. However, it turns out that a more complete description of the imaging properties of the system for tomographic optical diffraction can be achieved using a 3D representation of the transfer function in k-space. According to this formalism, TSI is presented as a linear filtering operation. In this paper we describe the transfer function of TSI in 3D k-space, evaluate the 3D point spread function and present simulated results.

Angle adjusting mechanism for streetlamp

Abstract: An angle adjusting mechanism for a streetlamp includes a housing connected with a lamp, and an angle positioning board and a lamppost sleeve installed in the housing. The angle positioning board has a first positioning hole and a plurality of second positioning holes. The lamppost sleeve has a first positioning tube and a second positioning tube. Through pre-arranging corresponding angles of the angle positioning board and the lamppost sleeve, the illumination angle of the lamp is capable of being adjusted. Moreover, the lamppost sleeve and the angle positioning board are fastened by screws, so the illumination angle of the lamp and the housing can be rapidly adjusted through loosening or fastening the screws.

Street lamp with four-direction adjustable illumination angle

Abstract: The utility model relates to a street lamp with a four-direction adjustable illumination angle, comprising a lamp holder directly fixed on a street lamp post; the lamp holder is provided with a lamp disc which is internally provided with a light source; and the lamp disc and the lamp holder are connected by an adjusting mechanism capable of adjusting the illumination angle of the light source. The street lamp leads the illumination angle of the lamp disc to be capable of realizing adjustment towards four directions, is convenient to adjust the illuminating range when the street lamp is installed, is convenient and practical and has wide range.

High-power LED illumination module for road illumination

Abstract: The invention discloses a high-power LED illumination module for road illumination, which comprises a radiator and is characterized in that radiating teeth at uniform intervals are distributed on the radiator; the radiating teeth are in a columnar elliptical arc tooth structure with strong functions of convection, ventilation and heat dissipation; and lateral teeth are also arranged at two sides of the radiator, wherein air gaps are formed among the racks of the lateral teeth. The high-power LED illumination module of the invention can be flexibly combined into the needed lamps of various styles according to the needs in practical application, stable air convection can be kept among modules, heat dissipation is accelerated, the characteristic of long service life of a semiconductor illumination lamp is ensured, and simultaneously, each module can independently adjust the illumination angle according to the needs.

Angle adjustable lamp

Abstract: An angle adjustable lamp includes a base, at least one lamp holder, a support rod installed between the base and the lamp holder, and an angle adjusting mechanism disposed between the support rod and the lamp holder. The angle adjusting mechanism includes a plurality of cavities circularly arranged at one end of the support rod, at least one protrusion formed on the lamp holder and a bolt. The shape and location of the protrusion is corresponding to the cavities. The bolt pivots the support rod and the lamp holder, so the protrusion can be engaged with various cavities. When the lamp holder is turned, the location of the protrusion is changed so as to be engaged with another cavity, such that the illumination angle of the lamp is adjusted. The adjusted angle is fixed through tightening the bolt.

Large-angle zooming illumination camera lens of optical fiber coupling semi-conductor laser

Abstract: Disclosed is a large-angle zooming illumination camera lens of an optical fiber coupling semi-conductor laser. The technical scheme includes that the large-angle zooming illumination camera lens comprises lenses and an optical fiber joint for mounting an optical fiber head, the lenses have three groups, the three groups of lenses and the optical fiber head are located on the same axial line, a lens I with focal length of f1, a lens II with focal length of f2 and a lens III with focal length of f3 are sequentially arrayed from the optical fiber head, the lens I and the lens II are fixedly arranged on a lens frame, a distance between the lens I and the optical fiber head meets the relation: L1=f1, a distance L2 between the lens II and the lens III meets the relation: f2 f2, the lens III is connected with a power driving mechanism, and F of the lens III meets the relation: F<2. The camera lens is simple in structure, enlarges the largest illumination angle, simultaneously can realize continuous change of the illumination angle, and meets the requirement of large-range and far-distance illumination.

Infrared auto-induction LED light

Abstract: The utility model relates to technical field of light fixture, especially relates to an infrared auto-induction LED light, comprising an LED light, a reflector, a light holder, a lighting post and an infrared auto-inductor, wherein the LED light is arranged on the reflector which is arranged on the light holder, the infrared auto-inductor is arranged on the lighting post; also comprising a turnplate which is arranged on the top of the lighting post and is rotatable, wherein the lighting post is provided with a fastener, the turnplate is provided with a long slot on which the fastener can slide and be clamped, the fastener of the light holder clamps the long slot of the turnplate The illumination angle of the utility model is adjustable and is more flexible for application

Large caliber air-core photon crystal optical fiber light pipe illumination device

Abstract: The present invention discloses a heavy caliber air core photon crystal optical fiber light guide tube illumination device, which belongs to the illumination device technical field. Light sources are symmetrically arranged on the left end and the right end of a light guide tube via a reflection bowl. The light guide tube adopts heavy caliber air core photon crystal optical fiber, the diameter of the optical fiber is 8mm to 150 mm, the diameter of the center air core is 7 mm to 149 mm, and the number of the air hole covering layers at the periphery of the air core is 25 to 35 layers, and the diameter of the air hole is 25 to 30 [mu]m. The sector region of the illumination angle of the bottom of the light guide tube preserves 2 to 4 air hole covering layers from the inside to the outside. The outer layer has a solid structure. The illumination device uses the light leakage of the heavy caliber air core photon crystal optical fiber to carry out light guiding and illumination so as to generate uniform illuminating white light. Large area uniform illumination can be realized, so that the illuminated region is bright and has no shadows. The illumination device with characteristics of energy saving, convenient maintenance, simple structure, stable running is capable of meeting the illumination requirements of factories, mines, large exhibition halls, subway stations, multi-floor shops, etc.

Full-angle illumination LED bulb

Abstract: The utility model discloses a full-angle illumination LED bulb, which comprises a lamp base (1). A driving circuit is disposed in the lamp base (1), one end of the lamp base (1) is provided with a lamp cap (2) while the other end is provided with a radiator (3), five LED substrates (5) are vertically arranged on the radiator (3), the end of the lamp base (1) is provided with a transparent lampshade (4) capable of covering the five LED substrates (5), the five LED substrates (5) encircle to form a regular pentagon, the outer side surface of each LED substrate (5) is provided with a plurality of LED chips (6), and the driving circuit is electrically connected with the lamp cap (2) and the LED chips (6). The five LED substrates encircle to form regularly pentagonal luminous surfaces, the included angle between each two luminous surface is 72 degrees and is smaller than the luminous angle of 120 degrees of a surface-mounted LED chip, and the illumination angle of a luminous body formed by four luminous surfaces can be larger than 360 degrees, thereby covering all illumination range and avoiding illumination 'blind area' of the full-angle illumination LED bulb. Besides, the full-angle illumination LED bulb is fine in radiation due to the radiator.

LED safety lamp reflector

Abstract: The utility model provides an LED safety lamp reflector. The internal surface of the LED safety lamp reflector consists of a first reflecting surface and a second reflecting surface, wherein the first reflecting surface consists of m*n isosceles trapezoid reflecting surface which is formed by crossed n+1 longitudinal broken lines with m-1 inflexion points and m+1 transverse broken lines with n-1 inflexion points; the longitudinal broken lines are one group of longitudinal broken lines that is formed by taking one of the longitudinal broken lines as a starting line and rotating the broken line around the axis line OO' with the interval of (180/n) degrees; the n+1 longitudinal broken lines and the first longitudinal broken line are arranged in the same installation plane; and the second reflecting surface is connected with the external edge of the first reflecting surface and consists of at least one layer of semi-cylindrical surfaces that are continuously arranged. In the utility model, the LED safety lamp reflector improves the illumination efficiency, promotes the utilization ratio of the light source, eliminates the defects that the traditional safety lamp forms non-uniform facula in the illumination area, and ensures the illumination angle of the LED safety lamp complying with the national illumination standards on safety lamp.

Desk lamp with adjustable illumination angle

Abstract: The utility model provides a desk lamp with adjustable illumination angle. The desk lamp is provided with a lamp cap which is adjustable in height and at various angles, a junction of the lamp cap and a supporting rod is provided with a universal joint, the supporting rod below the lamp cap is equipped with a bendable rod, the lower end of the bendable rod below the lamp cap is provided with a height-adjustable telescopic socket; the desk lamp adopting the above structure can meet the illumination requirements for various angles and height when being used, and is particularly suitable for being put on office desk during working and learning.

Electronic anti-dazzle system for vehicle

Abstract: The utility model discloses an electronic anti-dazzle system for a vehicle The front wind shield of a vehicle consists of two ordinary glass layers, and a liquid crystal layer is arranged between the two ordinary glass layers; a sunlight illumination angle sensor and a driver eye view angle sensor are arranged on the front wind shield, and the output ends of the sunlight illumination angle sensor and the driver eye view angle sensor are connected with an electrical control unit (ECU); an output end of the ECU is connected with the liquid crystal layer; and a black matrix area is formed on the liquid crystal layer by the ECU according to signals input by the sunlight illumination angle sensor and the driver eye view angle sensor The system effectively avoids the interference of the sunlight on the driver so that a user only needs to turn on the system without any operation Relative to the traditional sunshade system, the system can prevent sunshade failures caused by turning or swinging of the vehicle, thereby greatly improving the driving safety and comfortableness and meeting the requirement on hommization

Intelligent solar power blind

Abstract: An intelligent solar power blind comprises a main mechanism, a sensing mechanism, a positioning mechanism and a power-storing mechanism; with the combination of the mentioned mechanisms, the present invention is provided with the function of sensing the sunlight illumination angle and automatically adjusting light shielding positions of blades of the blind; solar panels installed on the blades are utilized to convert the shielded sunlight into electric power for being stored and used; and the sensing mechanism can be finely tuned according to season changes.

Safety helmet with illumination device

Abstract: The utility model belongs to the field of illumination tools used for mines, in particular to a safety helmet with an illumination device, which comprises the safety helmet and an illumination lamp, and is characterized in that two safety helmet connecting pieces are symmetrically arranged above the front brim of the safety helmet, and are hinged with a right angle type connecting piece between the two safety helmet connecting pieces; the right angle type connecting piece is hinged with a flat plate connecting piece fixedly connected with a U-type clamp through a bolt; the illumination lamp is clamped on the U-type clamp; the internal outline of the U-type clamp is matched with the shape of the illumination lamp; the U-type clamp adopts an elastic metal material; and the safety helmet connecting piece is a right angle type connecting piece. The utility model solves the problem that the illumination angle can not be adjusted randomly, can be converted between the head-mounted illumination and the hand-hell illumination very conveniently, and is very suitable for individually overhauling opencast excavating equipment under the circumstance of no power at night.