비만아 부모의 돌봄 경험: q 방법론

We present SLIM, a new optical method measuring optical pathlength changes of 0.3 nm spatially and 0.03nm temporally. SLIM combines two classic ideas in light imaging: Zernike’s phase contrast microscopyand Gabor’s holography.

Spatial light interference microscopy (SLIM)

Transport of intensity equation: a tutorial

A six-piece optical lens for capturing image and a six-piece optical module for capturing image are provided. In order from an object side to an image side, the optical lens along the optical axis includes a first lens with refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with refractive power and a sixth lens with refractive power. At least one of the image-side surface and object-side surface of each of the six lens elements is aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.

Optical image capturing system

In this work, we present a multifield direct design method for ultrashort throw ratio projection optics. The multifield design method allows us to directly calculate two freeform mirror profiles, which are fitted by odd polynomials and imported into an optical design program as an excellent starting point. Afterward, these two mirrors are represented by XY polynomial freeform surfaces for further optimization. The final configuration consists of an off-the-shelf projection lens and two XY polynomial freeform mirrors to greatly shorten the regular projection distance from 2 m to 48 cm for a 78.3 inch diagonal screen. The values of the modulation transfer function for the optimized freeform mirror system are improved to over 0.6 at 0.5 lp/mm, in comparison with its rotationally symmetric counterpart’s 0.43, and the final distortion is less than 1.5%, showing a very good and well-tailored imaging performance over the entire field of view.

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Multifield direct design method for ultrashort throw ratio projection optics with two tailored mirrors

This paper presents a distortion correction method for designing a wide field of view (FOV) lens for an imaging system. The lens is composed of two aspheric surfaces and several spheres. In the preliminary design, profiles of the aspheric surfaces can be obtained according to aplanatism, refraction law, and polynomial fitting methods, where the numeric computation, the differential geometry computation, and the polynomial fitting algorithm are stated in detail. Then the lens is optimized by the damped least squares method. Theoretically, this method cannot eliminate aberrations absolutely but can balance some kinds of aberrations to the image well. Furthermore, a projector lens with a wide FOV, low distortion, and low throw ratio [TR = (projection distance)/(image diagonal size)] is designed successfully by this method.

Method to design two aspheric surfaces for a wide field of view imaging system with low distortion.

Portable multi-spectral lens-less microscope with wavelength-self-calibrating imaging sensor

The invention discloses a spherical immersion three-dimension displaying system based on light field splicing. The system comprises an image generating and controlling module, a projector array and a spherical curtain scattering screen. The image generating and controlling module analyzes a three-dimension displaying scene needing to be displayed into a series of image elements which are needed in projection towards the spherical center along the radius and coding compression is carried out on the three-dimension displaying scene. An image split screen control module is used for transmitting and distributing all sub-images which received coding compression to each projector. The projectors project the images onto a spherical curtain two-direction scattering screen and light rays are scattered in two directions so that an observer in a spherical curtain can observe an exquisite solid three-dimension scene with binocular parallax. The invention further provides a spherical immersion three-dimension displaying method based on light field splicing. According to the spherical immersion system structure based on light field splicing, the effect of surrounding the observer with the three-dimension scene can be achieved and the sense of reality of the three-dimension scene is boosted.

Spherical immersion three-dimension displaying method and system based on light field splicing

Experimental analysis and designing strategies of lens-less microscopy with partially coherent illumination

The invention provides a portable intelligent multi-spectral imaging detection device and method. The device includes a light filter unit, a camera shooting unit, and a data transmitting-receiving module for receiving the camera shooting unit image data. The light filter unit comprises a plurality of coaxial and independently rotatable light filter wheels, each light filter wheel is provided with several light filter equipped mounting holes and at least one avoidance hole, and the distances between the central axis of the mounting holes, avoidance holes and the camera shooting unit's lens and the central axis of the light filter wheels are equal. The portable intelligent multi-spectral imaging detection device provided by the invention realizes portability and miniaturization of the device through the highly integrated light filter wheels and an integrated varifocal camera shooting way. White light LED is adopted as the active lighting source, thus realizing low power consumption of the spectrometer. The detection device and method are independent of traditional laptops, and acquire hyperspectral images through the communication mode of a mobile terminal, and utilize a remote cloud share server to analyze and process hyperspectral data.

Yinxu Bian

Papers

Method to design two aspheric surfaces for a wide field of view imaging system with low distortion.

Portable multi-spectral lens-less microscope with wavelength-self-calibrating imaging sensor

Spherical immersion three-dimension displaying method and system based on light field splicing

Experimental analysis and designing strategies of lens-less microscopy with partially coherent illumination

Portable intelligent multi-spectral imaging detection device and method