Multi-angle test system for surface feature spectrum
阅读说明：本技术 地物光谱多角度测试系统 (Multi-angle test system for surface feature spectrum ) 是由 张航 张睿鹏 兰强 金琪程 陈懿 于 2019-11-21 设计创作，主要内容包括：本发明公开了一种地物光谱多角度测试系统,光学检测设备技术领域,本发明的地物光谱多角度测试系统,由测试平台、光源系统和光源支架组成,在结构上采用铝合金型材和圆弧形铝合金型材轨道,光源系统沿圆弧形铝合金型材轨道0-90度范围内偏转,可极大简化系统结构降低系统重量；通过天顶角旋转机构可带动光纤探测器在光纤距上样品台一定距离内做半球空间旋转,以及通过方位角旋转机构在一定直径内做水平旋转,可对不同大小和体积的漫反射物体反射特性进行测量,特别是用于遥感技术领域中对地物三维空间光分布进行测量,本测试系统可以在航天遥感、地理信息、海洋开发、气候研究、军工信息等领域得到广泛应用。(The invention discloses a multi-angle test system for a ground object spectrum, which belongs to the technical field of optical detection equipment and comprises a test platform, a light source system and a light source bracket, wherein an aluminum alloy profile and an arc-shaped aluminum alloy profile track are adopted in the structure, and the light source system deflects within the range of 0-90 degrees along the arc-shaped aluminum alloy profile track, so that the system structure can be greatly simplified and the system weight can be reduced; the zenith angle rotating mechanism can drive the optical fiber detector to rotate in a hemispherical space within a certain distance from the optical fiber to the upper sample platform, and the azimuth angle rotating mechanism can horizontally rotate within a certain diameter, so that the reflection characteristics of diffuse reflection objects with different sizes and volumes can be measured, and the test system is particularly used for measuring three-dimensional space light distribution of ground objects in the technical field of remote sensing.)
1. The multi-angle test system for the surface feature spectrum is characterized by consisting of a test platform, a light source system and a light source bracket;
the test platform comprises:
a platform support;
the azimuth rotating mechanism is positioned above the platform support and comprises an upper layer disk and a lower layer disk, wherein the upper layer disk is provided with a central hole, the upper layer disk can horizontally rotate in the 360-degree forward and reverse directions relative to the lower layer disk through the driving of a power mechanism, and the lower layer disk is fixed on the platform support;
the upper sample platform is positioned at the circle center of the upper layer disc and used for placing a measured object;
the zenith angle rotating mechanism is fixed on the circumference of the upper layer disc, the zenith angle rotating mechanism is driven by a stepping motor to rotate within +/-90 degrees in a vertical plane, an optical fiber detector is mounted at the top of the zenith angle rotating mechanism, and the optical fiber detector realizes three-dimensional space reflected light distribution measurement of a measured object within a hemispherical range through an azimuth angle rotating mechanism and the zenith angle rotating mechanism;
the light source support comprises an arc-shaped track and is fixedly connected with the lower-layer disc;
the light source system slides on the circular arc-shaped track, the light source system is a standard A light source or an off-axis aspheric reflection light source, and the incident angle range of the light source system is 0-90 degrees.
2. The multi-angle test system for spectrum of ground features according to claim 1, wherein the zenith angle rotating mechanism comprises a frame consisting of a vertical frame and a horizontal frame, the bottom end of the vertical frame is connected with the stepping motor and the speed reducer through a rotating shaft, the horizontal frame realizes height adjustment within 1 meter through a slide way and a fixed knob on the vertical frame, and the optical fiber detector is installed at one end of the horizontal frame, so that the detector head is aligned to the center of the azimuth angle rotating mechanism.
3. The multi-angle test system for spectrum of ground features of claim 1, wherein the upper disc of the azimuth rotation mechanism is connected to the stepping motor and the reducer through a rotation shaft fixed at the center, and the lower disc is used as a rotation base of the upper disc and is fixedly connected to the platform support.
4. The surface feature spectrum multi-angle test system of claim 1, wherein the test platform further comprises a lower sample table located below the platform support and used for placing a tested object, and the lower sample table realizes height adjustment within 0.5 meter in the vertical direction through a slide rod and a fixing knob arranged in the vertical direction.
5. The multi-angle test system for the spectrum of the surface feature of claim 1, wherein the power mechanism of the azimuth rotation mechanism comprises a stepping motor and a speed reducer, a synchronous belt and a synchronous belt pulley are driven by the stepping motor and the speed reducer to further realize that the upper disc rotates within 360 degrees of a horizontal plane, and one end of the synchronous belt pulley is connected with a manual azimuth rotation handle.
6. The surface feature spectrum multi-angle test system according to claim 1, wherein the light source support is composed of an aluminum alloy profile frame and an arc-shaped aluminum alloy profile rail, the aluminum alloy profile frame is fixed on the ground, and the arc-shaped aluminum alloy profile rail is fixed on the aluminum alloy profile frame, so that light beams emitted by the light source system moving along the arc-shaped aluminum alloy profile rail always pass through the center of the arc-shaped aluminum alloy profile rail.
7. The multi-angle test system for spectrum of ground features according to claim 1, wherein the light source system is driven by the power driving system to automatically deflect 0-90 degrees along the circular arc track relative to the center thereof.
8. The feature spectrum multi-angle test system of claim 7, wherein the power driving system is composed of a motor, a worm gear reducer, a chain wheel, a transmission chain, a pulley, a braking device and a power driving system base, the motor and the worm gear reducer are connected and fixed on the power driving system base, the worm gear reducer can stop the light source system at any position on the circular arc-shaped track, the chain wheel is connected with an output shaft of the worm gear reducer and meshed with the transmission chain, the transmission chain is fixed on the circular arc-shaped track, the pulley is installed on the power driving system base, the braking device is installed on the power driving system base, and the power driving system base is installed on the circular arc-shaped track and moves on the circular arc-shaped track.
9. The multi-angle test system for spectrum of ground features of claim 8, wherein the light source system is fixedly installed on the base of the power driving system.
10. The multi-angle test system for the spectrum of the surface feature of claim 1, wherein the light source system adopts an off-axis aspheric reflection light source, and comprises a large-size off-axis aspheric reflector, a light source and a profile bracket, and the light source system can reflect light beams generated by the light source to a tested object through the large-size off-axis aspheric reflector.
Technical Field
The invention relates to the technical field of optical detection equipment, in particular to a ground object spectrum multi-angle test system.
Background
A Bidirectional Reflectance Distribution Function (BRDF) is a basic physical quantity reflecting the spatial reflectance characteristics of a material surface, and describes the distribution of reflected light from an incident light ray from a given direction reflected through the material surface into various directions in space. For the surface of a ground object, the BRDF determines the surface morphology of the observed material at different viewing angles. Since the BRDF is a complex multidimensional function, simplified models of diffuse and specular reflection are often used to describe the complete reflection characteristics.
At present, the common centralized BRDF measuring scheme at home and abroad mainly realizes the change of the incident and reflection directions in space by changing the relative positions of a detector, a sample and a light source. In a measurement experiment, the design scheme is simpler when the accuracy of the rotation angle is not required, and a plurality of rotary tables and translation tables are required to be used simultaneously under the condition of special requirements; in addition, in some devices, the goniometer stage is placed in a vacuum environment, and some devices also use multiple detectors or optical fibers to improve sensitivity and achieve rapid sampling, which is complicated and costly.
In addition, the light source scheme commonly used at home and abroad has the disadvantages of complex structure, heavy weight, high processing and manufacturing cost, limited illumination area, certain difficulty in large test sample experiments and poor illumination uniformity.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a ground object spectrum multi-angle test system, which only adopts a test platform and a detector to realize rapid sampling, meets the requirements of laboratory visible spectrum, infrared spectrum BRDF test and outdoor remote sensing test, simplifies the structure of the existing light source system, reduces the cost, can increase the illumination area, and has high and more uniform illumination energy.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the multi-angle test system for the surface feature spectrum comprises a test platform, a light source system and a light source bracket;
the test platform comprises:
a platform support;
the azimuth rotating mechanism is positioned above the platform support and comprises an upper layer disk and a lower layer disk, wherein the upper layer disk is provided with a central hole, the upper layer disk can horizontally rotate in the 360-degree forward and reverse directions relative to the lower layer disk through the driving of a power mechanism, and the lower layer disk is fixed on the platform support;
the upper sample platform is positioned at the circle center of the upper layer disc and used for placing a measured object;
the zenith angle rotating mechanism is fixed on the circumference of the upper layer disc, the zenith angle rotating mechanism is driven by a stepping motor to rotate within +/-90 degrees in a vertical plane, an optical fiber detector is mounted at the top of the zenith angle rotating mechanism, and the optical fiber detector realizes three-dimensional space reflected light distribution measurement of a measured object within a hemispherical range through an azimuth angle rotating mechanism and the zenith angle rotating mechanism;
the light source support comprises an arc-shaped track and is fixedly connected with the lower-layer disc;
the light source system slides on the circular arc-shaped track, the light source system is a standard A light source or an off-axis aspheric reflection light source, and the incident angle range of the light source system is 0-90 degrees.
Preferably, the zenith angle rotating mechanism comprises a frame consisting of a vertical frame and a horizontal frame, the bottom end of the vertical frame is connected with the stepping motor and the speed reducer through a rotating shaft, the horizontal frame realizes height adjustment within a range of 1 meter through a slide way and a fixing knob on the vertical frame, and the optical fiber detector is installed at one end of the horizontal frame, so that the detector head is aligned to the center of the azimuth angle rotating mechanism.
Preferably, the upper layer disk of the azimuth rotating mechanism is connected with the stepping motor and the speed reducer through a rotating shaft fixed at the center, and the lower layer disk is used as a rotating base of the upper layer disk and is fixedly connected with the platform support.
Preferably, the optical fiber detector realizes the height adjustment of plus or minus 70-80 mm in the vertical direction and the fine adjustment of plus or minus 1-2 mm in the horizontal direction through an X-Y bidirectional micro-displacement table.
Preferably, a level gauge is embedded on the upper surface of the upper-layer disk.
Preferably, the upper layer disc is provided with azimuth angle scales.
Preferably, the output end of the stepping motor of the zenith angle rotating mechanism is connected with an encoder.
Preferably, still include the lower sample platform that is located platform support below for place the testee, sample platform realizes the altitude mixture control within 0.5 meters of vertical direction through the slide bar and the fixed knob that vertical direction set up down.
Preferably, the power mechanism of the azimuth rotating mechanism comprises a stepping motor and a speed reducer, a synchronous belt and a synchronous belt pulley are driven by the stepping motor and the speed reducer, so that the upper-layer disc can rotate within 360 degrees of a horizontal plane, and one end of the synchronous belt pulley is connected with a manual azimuth rotating handle.
Preferably, a plurality of universal casters are mounted to the bottom of the platform support.
Preferably, the light source support is composed of an aluminum alloy profile frame and an arc-shaped aluminum alloy profile track, the aluminum alloy profile frame is fixed on the ground, and the arc-shaped aluminum alloy profile track is fixed on the aluminum alloy profile frame, so that a light beam emitted by the light source system moving along the arc-shaped aluminum alloy profile track always passes through the center of the arc-shaped aluminum alloy profile track, and the light source system can deflect 0-90 degrees relative to the central axis of the arc-shaped aluminum alloy profile track.
Preferably, the light source system is driven by a power driving system to automatically deflect 0-90 degrees relative to the center of the light source system along the circular arc track.
Preferably, the power driving system is composed of a motor, a worm and gear reducer, a chain wheel, a transmission chain, a pulley, a braking device and a power driving system base, wherein the motor is connected with the worm and gear reducer and fixed on the power driving system base, the worm and gear reducer can stop the light source system at any position on the circular arc-shaped track, the chain wheel is connected with an output shaft of the worm and gear reducer and meshed with the transmission chain, the transmission chain is fixed on the circular arc-shaped track, the pulley is installed on the power driving system base, the braking device is installed on the power driving system base, and the power driving system base is installed on the circular arc-shaped track and moves on the circular arc-shaped track.
Preferably, the light source system is fixedly installed on the base of the power driving system.
Preferably, the light source system adopts an off-axis aspheric reflection light source, consists of a large-size off-axis aspheric reflector, a light source and a profile bracket, and can reflect light beams generated by the light source to a measured object through the large-size off-axis aspheric reflector.
Compared with the prior art, the invention has the beneficial effects that:
the ground object spectrum multi-angle test system adopts the aluminum alloy section and the arc-shaped aluminum alloy section rail in the structure, the light source system can deflect within the range of 0-90 degrees on the arc-shaped aluminum alloy section rail, and the standard A light source system and the off-axis aspheric reflection light source system mentioned in the invention can greatly simplify the system structure and reduce the system weight; the zenith angle rotating mechanism can drive the optical fiber detector to rotate in a hemispherical space within a certain distance from the optical fiber to the upper sample platform, and the azimuth angle rotating mechanism can horizontally rotate within a certain diameter, so that the reflection characteristics of diffuse reflection objects with different sizes and volumes can be measured, and the platform is particularly used for measuring the three-dimensional space reflection light distribution of ground objects in the technical field of remote sensing.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a perspective view of a multi-angle test system for spectrum of a feature of the present invention;
FIG. 2 is a front view of the multi-angle test system for spectrum of the feature of the present invention;
FIG. 3 is a perspective view of an off-axis aspheric reflective light source system of the present invention.
Description of reference numerals:
1. a horizontal frame; 2. a vertical frame; 3. a stepping motor; 4. an encoder; 5. a sample loading platform; 6. an upper disc; 7. a lower disc; 8. a sample stage is arranged; 9. a manual azimuth rotation handle; 10. a stepping motor; 11. a universal caster; 12. a platform support; 13. an azimuth rotation mechanism; 14. a zenith angle rotating mechanism; 15. an optical fiber detector; 16. circular arc aluminum alloy profile rails; 17. an aluminum alloy profile frame; 18. a motor; 19. a worm gear reducer; 20. a sprocket; 21. a drive chain; 22. a pulley; 23. a braking device; 24. a power drive system base; 25. a large-size off-axis aspheric mirror; 26. a light source; 27. a profile support; 28. a test platform; 29. a standard A light source; 30. a light source holder; 31. an off-axis aspheric reflective light source.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
A multi-angle test system for a ground object spectrum is shown in figures 1-2 and comprises a
the test platform comprises: the device comprises a platform support 12, an azimuth rotating mechanism 13 positioned above the platform support 12, an upper sample table 5 positioned at the circle center of an upper layer disc 6 of the azimuth rotating mechanism, and a zenith angle rotating mechanism 14 fixed on the circumference of the upper layer disc 6;
the platform support 12 can be designed as a cylindrical frame body according to the azimuth rotation mechanism 13;
the azimuth rotating mechanism 13 comprises an upper layer disk 6 and a lower layer disk 7 with central holes, the upper layer disk 6 can horizontally rotate in two directions of 360 degrees in a positive and negative direction relative to the lower layer disk 7 through the driving of a power mechanism, and the lower layer disk 7 is fixed on the platform support 12; the diameter of a rotary disc of the azimuth rotating mechanism 13 is 1 meter, which is closer to the situation of ground objects irradiated by sunlight, and is beneficial to the accuracy of BRDF test results;
the sample loading platform 5 is used for placing a measured object;
the zenith angle rotating mechanism 14 is driven by the stepping motor 3 to rotate within +/-90 degrees in a vertical plane, the top of the zenith angle rotating mechanism is provided with the optical fiber detector 15, and the optical fiber detector 15 realizes three-dimensional space reflected light distribution measurement of a measured object within a hemispherical range through the azimuth angle rotating mechanism 13 and the zenith angle rotating mechanism 14;
the light source support comprises an arc-shaped
the light source system slides on the
As a preferred embodiment, the zenith angle rotating mechanism 14 includes a frame composed of a vertical frame 2 and a horizontal frame 1, the bottom end of the vertical frame 2 is connected with the stepping motor 3 and the reducer through a rotating shaft, the horizontal frame 1 realizes height adjustment within 1 meter through a slide way and a fixed knob on the vertical frame 2, and an optical fiber detector 15 is installed at one end of the horizontal frame 1, so that the detector head is aligned with the center of the azimuth angle rotating mechanism 13. Specifically, the end part of the optical fiber detector is provided with a universal polaroid mounting interface, the polarization azimuth angle can be flexibly assembled and disassembled and can be randomly and manually positioned, the angle division precision is 1 degree, and the optical fiber detector has a return-to-0 adjusting function.
In a preferred embodiment, the upper disc 6 of the azimuth rotation mechanism 13 is connected to a stepping motor and a reducer through a rotating shaft fixed at the center, and the lower disc 7 is fixedly connected to the platform support 12 as a rotating base of the upper disc 6.
In a preferred embodiment, the optical fiber detector 15 realizes the height adjustment of plus or minus 70-80 mm in the vertical direction and the fine adjustment of plus or minus 1-2 mm in the horizontal direction through an X-Y bidirectional micro-displacement table.
In a preferred embodiment, a leveling instrument is fitted to the upper surface of the upper disc 6, and the azimuth rotating mechanism is horizontally adjustable according to the leveling instrument.
In a preferred embodiment, the upper disc 6 is provided with azimuth angle scales, and the minimum resolution is 0.5 degrees.
As a preferred embodiment, the output end of the stepping motor 3 of the zenith angle rotating mechanism 14 is connected with an encoder 4, the rotation angle of the zenith angle rotating mechanism 14 can be accurately controlled by a coaxial output encoder, and the resolution is 0.02 degrees. Meanwhile, the azimuth angle rotating mechanism 13 and the zenith angle rotating mechanism 14 can continuously rotate, and the requirements of automatic control and high precision of the working angles of the light source and the detector by a user are met, namely the resolution of the rotating angle of the upper layer disc 6 is 0.5 degree, and the resolution of the rotating angle of the optical fiber detector 15 is 0.02 degree.
As a preferred embodiment, the multi-angle test system for spectrum of surface feature further comprises a lower sample stage 8 located below the platform support 12 and used for placing the object to be tested, wherein the lower sample stage 8 realizes height adjustment within a range of 0.5 meter in the vertical direction through a slide rod and a fixed knob arranged in the vertical direction. The test sample table is divided into an upper sample table and a lower sample table, wherein one upper sample table 5 is fixed, the other lower sample table 8 can move up and down, the moving distance is 0.5 m, the diameter of the sample table is 0.3 m, and the requirements of various size samples and different test distances can be met.
As a preferred embodiment, the power mechanism of the azimuth rotation mechanism 13 includes a stepping motor 10 and a speed reducer, a synchronous belt and a synchronous pulley are driven by the stepping motor and the speed reducer to further realize that the upper disc 6 rotates within 360 degrees of the horizontal plane, and one end of the synchronous pulley is connected with a manual azimuth rotation handle 9. But electric rotation and manual rotation interchange mode are rotatory, satisfy quick large-angle rotation's requirement, have reduced test time, have improved efficiency of software testing, convenience of customers test in the furthest scope.
In a preferred embodiment, a plurality of casters 11 are mounted on the bottom of the platform support 12 to facilitate and speed movement.
As a preferred embodiment, the light source bracket is composed of an aluminum
In a preferred embodiment, the light source system is automatically deflected by a power drive system along the
As a preferred embodiment, the power driving system is composed of a
In a preferred embodiment, the
In a preferred embodiment, the light source system may also use an off-axis aspheric reflective
The invention provides a multi-angle test system for a ground object spectrum, which only adopts one platform and one detector to realize the rapid sampling of diffuse reflection objects with different sizes and volumes, and meets the requirements of BRDF (bidirectional reflectance distribution function) tests and outdoor remote sensing tests in a laboratory visible spectrum (wave band 380nm-780nm), infrared spectrum (780nm-1.1 mu m, 1.1 mu m-3 mu m and 3 mu m-10.6 mu m). The platform can be widely applied to the fields of space remote sensing, geographic information, ocean development, climate research, military information and the like.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
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