The invention discloses an optical-system focal-length measuring system and a method. The system includes a laser point illumination positioning module, a light splitter, a point detection and positioning module, a standard plane mirror and goniometer equipment. The laser point illumination positioning module emits a laser at a focus of a measured optical system; the laser passes through the beamsplitter to enter the measured optical system, and then forms parallel light to exit; the parallel light is reflected to the measured optical system through the standard plane mirror to form collimation light by convergence; the collimation light is reflected through the beam splitter to form a reflection self-collimation focus; the goniometer equipment measures an included angle of the standard plane mirror and an optical axis of the measured optical system; the detection and positioning module positions the reflection self-collimation focus; a position change [delta]y which is of the reflection self-collimation focus and corresponds to an included-angle change [delta]theta of the standard plane mirror and the optical axis of the measured optical system is measured; and focal length of the measured optical system is calculated and obtained according to image height and focal-length relationships. The measuring system is accurate in focus positioning, and is suitable for use in installation, adjustment and detection of large-caliber long-focal-length optical-lenses of spatial optical remote sensors.

Optical-system focal-length measuring system and method

The invention discloses an ultra-light stray light eliminating assembly suitable for a coaxial micro-nano remote sensing camera, which relates to the field of space optical remote sensing. The ultra-light stray light eliminating assembly has the characteristics of light weight, simple structure, high stray light eliminating effect and the like, is excellent in mechanical property, and can meet thedual requirements of the micro-nano camera on quality and stray light elimination at the same time. The stray light eliminating assembly comprises a primary mirror light shield, a secondary mirror light shield and a primary force bearing structure. The primary mirror light shield and the secondary mirror light shield are fixedly installed through the primary bearing structure. According to the ultra-light stray light eliminating assembly disclosed in the invention, the coaxial structural form is adopted, the structure is simple, the primary mirror light shield and the secondary mirror light shield are both made of carbon fiber/epoxy composite materials, the advantages of being small in density, high in specific rigidity, high in specific strength, good in machining process, good in size stability, good in fatigue resistance, good in vibration resistance and the like are achieved, and therefore the quality and mechanical property requirements of micro-nano satellites are met.

Ultra-light stray light eliminating assembly suitable for coaxial micro-nano remote sensing camera

The invention provides a movable assembling and adjusting system for a meter-scale aperture optical lens supporting device. The movable assembling and adjusting system comprises a movable rotating device and an adjusting device. The adjusting device is arranged on the upper end face of the movable rotating device, and the movable rotating device is used for driving the adjusting device to rotate.The adjusting device comprises an outer-layer adjusting device and an inner-layer adjusting device. The outer layer adjusting device comprises three lifting adjusting assemblies, and the lifting adjusting assemblies are evenly distributed along the edge of the upper end face of the movable rotating device and used for adjusting the position and posture of the lens supporting device. The inner-layer adjusting device comprises a multi-dimensional adjusting table and a supporting assembly. The supporting assembly is arranged on the table top of the multi-dimensional adjusting table, the multi-dimensional adjusting table is used for adjusting the position and posture of the lens, and the supporting assembly is used for supporting the optical lens. By the adoption of assembling and the adjusting system, independent adjustment of the positions and postures of the lens and the lens supporting device can be achieved, and the risk that the lens surface is scratched can be avoided.

Movable assembling and adjusting system for meter-scale aperture optical lens supporting device

The invention relates to an on-orbit regulation method for a secondary mirror of a space optical remote senor. The on-orbit regulation method comprises the following steps of: after the space opticalremote senor is transmitted to an orbit, detecting an imaging result of the space optical remote senor; analyzing the imaging result to obtain a wave aberration of the space optical remote senor; judging whether the wave aberration of the space optical remote senor meets requirements; if no, after carrying out optical resolving on the wave aberration of the space optical remote senor, according toan optical resolving result, carrying out on-orbit regulation on a position and an attitude of the secondary mirror, until the wave aberration of the space optical remote senor meets the requirements; and if yes, ending regulation on the position and the attitude of the secondary mirror. According to the on-orbit regulation method for the secondary mirror of the space optical remote senor, afterthe imaging result of the space optical remote sensor is analyzed, on-orbit regulation on the position and the attitude of the secondary mirror is regulated, so that a position and attitude error of each optical element in an optical system can be effectively compensated, and on-orbit imaging performance of the large-caliber long-focus off-axis three-mirror optical system can be effectively improved. Moreover, the invention further provides the space optical remote sensor.

On-orbit regulation method for secondary mirror of space optical remote senor and space optical remote senor

The invention discloses an off-axis reflector mirror assembly and method for electron beam excitation fluorescence collection coupling. According to the invention, an off-axis reflecting mirror with an off-axis angle less than 90 degrees is adopted; the reflected and converged or reflected and collimated electron beam excitation fluorescence deviates from the positioning motion plane of an observed sample and is positioned between an objective lens of an electron microscope and the positioning motion plane of the observed sample such that a detection and coupling output area of electron beam excitation fluorescence is also positioned in the area, and the off-axis reflector mirror assembly does not hinder the normal positioning motion of the observed sample of the electron microscope; the optimization design of electron beam excitation fluorescence collection efficiency is carried out, and it is guaranteed that the fluorescence collection efficiency is superior to 80%; as a fluorescencecollection coupling component of an electron beam excitation fluorescence detection system, the off-axis reflector mirror assembly ensures that a sample of the electron microscope can be normally positioned and moved while efficiently collecting and coupling electron beam excitation fluorescence, and other detection components of the electron microscope can normally collect signals.

Off-axis reflector mirror assembly and method for electron beam excitation fluorescence collection coupling

The invention discloses a high-precision installation and adjustment method and device for a large-caliber toothed reflector component applied to a space camera. The method comprises the steps that first, a translation tilting table is fixedly connected with a rotary table, and a supporting tool is installed on the translation tilting table; second, a supporting frame is placed on the supporting tool in the first step; third, a reflector is placed on a six-dimensional adjustment table, and meanwhile teeth of the reflector are embedded into tooth slots of the supporting frame; and fourth, glueis injected into each tooth slot of the supporting frame to make the reflector and the supporting frame connected. Through the high-precision installation and adjustment method and device, high-precision micro-stress assembling of the large-caliber toothed reflector component applied to the space camera is realized; and after assembling, the surface shape loss of the reflector is small, the form and location tolerance between the reflector and the supporting structure is small, and the assembled reflector component can meet the requirement that high stability of the surface shape and the formand location is maintained after a vibration test.

High-precision installation and adjustment method and device for large-caliber toothed reflector component applied to space camera

Disclosed are a device and method for measuring the focal length of a large-aperture telephoto optical lens. The device includes an interferometer, a standard spherical reflector, a photoelectric auto-collimator, a laser tracker, and a data processing unit. A test light path is adjusted so that the optical axis of an optical lens is parallel to the parallel light emitted by the interferometer. Thesmall-aperture standard spherical reflector is placed at the theoretical position of an image focal point, the standard spherical reflector is adjusted to the actual position of the image focal point, and the laser tracker measures the spatial position of the standard spherical reflector. The interferometer is deflected, the deflection angle is measured, the standard spherical reflector is adjusted to the actual position of the image focal point, and the spatial position of the standard spherical reflector is measured with the laser tracker. The data processing unit calculates the focal length of the optical lens based on the deflection angle of the interferometer and the amount of change in the spatial position of the standard spherical reflector. The device and method in the invention can be used for focal length measurement of large-aperture telephoto optical lenses with different wavelengths, and have very important applications in the installation and testing of space optical remote sensors.

Device and method for measuring focal length of optical lens

The invention discloses a secondary mirror light shield used for a space large aperture camera. The light shield comprises a louver cover, a cone cover and a bracket. The bracket is a hollow column-shaped frame body, and the louver cover is glued to the outer side of the bracket and used for shielding interference beams between the main mirror and the secondary mirror of the space large aperture camera. The cone cover is glued to the inner side of the bracket and used for shielding and absorbing the diffuse reflection stray light generated by the internal structure of the space large aperturecamera. According to the invention, by gluing the louver cover and the cone cover on both sides of the bracket, the overall structure of the secondary mirror light shield is optimized and the defect that rigidity of the traditional secondary mirror light shield is weak is overcome; and by designing the configuration of the louver cover and the bracket, the shielding ratio of the secondary mirror light shield is reduced, and the problems that the conventional secondary mirror light shield is easily damaged and the processing precision is low are solved.

Secondary mirror light shield used for space large aperture camera

The invention discloses a high-precision secondary off-axis ellipsoidal reflector optical axis optical leading-out method and an optical system thereof. An off-axis ellipsoidal reflector is arranged in front of an optical interferometer emitting spherical waves, a standard spherical mirror with a very small aperture is arranged at the position away from the vertex short focus of the off-axis ellipsoidal reflector, and the off-axis ellipsoidal reflector, the standard spherical mirror and the optical interferometer are coaxial according to the Seidel coefficient to reflect light reflected by theoff-axis ellipsoidal reflector back to the interferometer. Two optical focuses of the off-axis ellipsoidal reflector are found out through the small hole targets, and then parallel light of the interferometer passes through the two small hole targets at the same time to obtain the optical axis of the off-axis ellipsoidal reflector. And a theodolite is used for aiming at the parallel light beams of the interferometer, and the directions of the parallel light beams are guided to other devices capable of representing the directions. The leading out method is simple, feasible and high in precision, is suitable for off-axis ellipsoidal reflectors with axisymmetric and non-axisymmetric shapes, and has very important application in installation and test of space optical remote sensors.

High-precision secondary off-axis ellipsoidal reflector optical axis leading-out method and optical system thereof

The invention discloses a discrete space camera secondary lens precision adjusting and fixing method which includes the following steps: connecting a general 5D adjusting mechanism with a secondary lens structure; getting the 3D translation and 2D tilt needed for the adjustment of the secondary lens; using the general 5D adjusting mechanism to adjust the secondary lens; using a filler gauge to getthe gap thickness d1; making a gasket with the gap thickness d1 as a center value; inserting the thin end of the gasket into the gap, and taking the contact position of the gasket and the secondary lens structure as a marking position; with the marking position of the gasket as the center, cutting off a plurality of secondary lens gaskets at a certain interval from the thin end and the thick endrespectively; and selecting a qualified gasket from the secondary lens gaskets, and installing the gasket in the gap between the secondary lens structure and the end face of a lens cone. The problem on 5D precision adjustment of the secondary lens of a space camera and fixation of the secondary lens after adjustment is solved, and the position of the fixed secondary lens can be kept highly stablebefore and after vibration test of the space camera.

Zong Xiaoying

Papers

High-precision installation and adjustment method and device for large-caliber toothed reflector component applied to space camera

Device and method for measuring focal length of optical lens

Secondary mirror light shield used for space large aperture camera

High-precision secondary off-axis ellipsoidal reflector optical axis leading-out method and optical system thereof

Discrete space camera secondary lens precision adjusting and fixing method