CN112013954A - Offner hyperspectral imaging system based on curved surface prism - Google Patents
Offner hyperspectral imaging system based on curved surface prism Download PDFInfo
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- CN112013954A CN112013954A CN202010934707.5A CN202010934707A CN112013954A CN 112013954 A CN112013954 A CN 112013954A CN 202010934707 A CN202010934707 A CN 202010934707A CN 112013954 A CN112013954 A CN 112013954A
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- 238000003384 imaging method Methods 0.000 claims abstract description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
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- 238000003825 pressing Methods 0.000 claims description 36
- 238000009966 trimming Methods 0.000 claims description 31
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- 239000000463 material Substances 0.000 claims description 9
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 5
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- 229910001374 Invar Inorganic materials 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
Abstract
The invention provides an offner hyperspectral imaging system based on a curved surface prism, which solves the problems of high processing precision requirement, compact assembly and adjustment space and large phase adjustment difficulty of the existing non-coaxial optical system. The imaging system comprises a substrate, an encoding component, an optical unit, a detector component and a first precise measuring mirror component; the optical unit comprises a plurality of curved surface prisms, each curved surface prism adopts a square curved surface prism, and the curved surface prisms are arranged on the substrate through the flexible supporting device; arranging a second precise measurement mirror assembly on the flexible device for monitoring the space angle of each assembly in the optical unit in the assembling and adjusting process; the first precise measurement mirror assembly is arranged on the substrate and used for monitoring the space angle of the whole machine when the offner hyperspectral imaging system is integrally assembled with other systems. Each optical element adopts a modular design, and the flexible supporting device ensures that each optical element has higher surface shape precision and position precision in a complex force and heat environment.
Description
Technical Field
The invention relates to the field of optical remote sensing instruments, in particular to an offner hyperspectral imaging system based on a curved prism.
Background
The dispersive hyperspectral imager is an optical remote sensor which can image a target and simultaneously obtain the spectral characteristics of the target, and is widely applied to the fields of military affairs, aerospace remote sensing, agriculture, biomedicine and the like due to the characteristics of high spectral resolution, strong band continuity and one map.
The dispersive element of the conventional dispersive imaging spectrometer must be placed in the collimated light path, so the system includes a collimator objective, which results in a complex structure, large volume and heavy weight of the system. The imaging principle of the prism type spectrometer is that when light rays with different wavelengths pass through an optical wedge, emergent light rays are deflected differently due to different refractive indexes, and therefore spectral dispersion is achieved. Compared with the used device of the traditional spectrometer, the curved prism has two functions of self-collimation and imaging, can be placed in a divergent light path, and omits a collimating objective of the traditional dispersion spectrometer, thereby simplifying the system and reducing the volume and the quality of the system.
The offner hyperspectral imager based on the curved surface prism accords with the miniaturization trend and is widely applied to satellite borne and airborne hyperspectral loads. For example, the earth observation satellite STSAT3 developed in korea in 2008 and the Enmap satellite developed in germany in 2012 both carry imaging spectrometers that employ offner optical systems. In addition, the offner hyperspectral imager based on the curved surface prism also effectively solves the problem of wide-spectrum imaging detection, the system eliminates system aberration by selecting proper curvature of the front surface of the curved surface prism, and imaging quality is improved.
In the existing offner imaging system based on the curved surface prism, the single curved surface prism adopts the traditional fixing mode of a lens cone, an inclined space ring and a pressing ring, the single curved surface prism is firstly designed in a modularized mode, and then each curved surface prism is installed in a box body. The design usually needs to process the cylindrical positioning end face of the optical glass of the curved prism, and the oblique space ring has higher processing difficulty and higher processing precision requirement. Meanwhile, the system adopts a box structure, the installation space is compact, the installation and adjustment space is limited, the installation and adjustment are difficult, and the phase problem of the circular curved surface prism is difficult to realize high-precision adjustment. In addition, the curved surface prism is required to be subjected to phase adjustment after being installed in the mirror frame, the adjustment process is complicated, and high-precision phases are difficult to ensure in a complex force-heat environment, so that the imaging quality of a hyperspectral system is reduced, and even imaging is difficult.
Disclosure of Invention
The invention aims to solve the problems of high processing precision requirement, compact assembling and adjusting space and high phase adjusting difficulty of the conventional curved prism-based offner hyperspectral optical system, and provides a curved prism-based offner hyperspectral imaging system, which is characterized in that each optical element is modularly designed and then is installed on a substrate, so that the assembling and adjusting difficulty of each optical part and each structural part is reduced; meanwhile, the flexible supporting devices are arranged on the optical components to ensure that the optical elements have higher surface shape precision and position precision in a complex force and heat environment; in addition, the system is also provided with a precision mirror assembly and a laser target mounting hole on each optical element to assist the assembly and adjustment of the imaging system.
In order to achieve the purpose, the invention is realized by the following technical scheme:
an offner hyperspectral imaging system based on a curved prism comprises a substrate, and an encoding assembly, an optical unit, a detector assembly and a first precise measuring mirror assembly which are arranged on the substrate; the light is incident to the optical unit through the coding assembly, and emergent light of the optical unit is incident to the detector assembly for imaging; the optical unit comprises a plurality of curved surface prisms, and the curved surface prisms are arranged on the substrate through the flexible supporting device; the first precision measurement mirror assembly is used for monitoring the position and the posture of each lens in the optical unit in the assembling and adjusting process; the flexible supporting device comprises a curved prism structure frame, a flexible piece, a flexible hoop, a flexible trimming pad, a pressing sheet, a laser tracker mounting seat and a second precision measuring mirror assembly; the prism structure frame is characterized in that prism mounting holes are formed in the curved surface prism structure frame, a plurality of pressing sheet mounting bosses and a plurality of first target mounting holes are formed in the front end face of the curved surface prism structure frame, a plurality of dismounting notches are formed in the rear end face of the curved surface prism structure frame, upper mounting bosses, lower mounting bosses and a plurality of adjusting holes are formed in the left side face and the right side face of the curved surface prism structure frame respectively, the upper mounting bosses and the lower mounting bosses are U-shaped bosses, the opening ends of the U-shaped bosses are far away from the front end face of the curved surface prism structure frame, and; the adjusting holes are used for adjusting the relative positions of the curved surface prism and the curved surface prism structure frame; the curved surface prism is arranged in the prism mounting hole, and a reference plane is arranged on the front end face of the curved surface prism; the pressing sheet is arranged on the pressing sheet mounting boss and is in contact with the reference plane of the curved prism, so that the axial auxiliary positioning of the curved prism in the assembling and adjusting process is realized; the flexible part is of a cylinder structure, a plurality of flexible grooves are formed in the outer wall of the flexible part and used for reducing the rigidity of the flexible part, grooves are formed in the outer side of the cylinder bottom of the flexible part and used for forming a flexible part bonding area, and glue injection holes are formed in the cylinder bottom and used for injecting connection glue into the flexible part bonding area; the flexible parts are arranged on the upper mounting boss and the lower mounting boss through flexible trimming pads and are bonded with the curved surface prism through connecting glue of a flexible part bonding area, and the flexible clamps are respectively arranged in the dismounting notches at the two sides of the curved surface prism structure frame and are fixedly connected with the curved surface prism structure frame; the laser tracker mounting base is arranged in the first target mounting hole and used for mounting the laser tracker, and the laser tracker is used for monitoring and adjusting the spatial position of the curved prism; and the second precise measurement mirror assembly is arranged on the curved surface prism structure frame through an installation interface arranged at the top end of the curved surface prism structure frame and is used for monitoring the position posture of the curved surface prism.
Further, the optical unit comprises a first curved prism, a first curved reflecting prism, a secondary reflector, a second curved prism, a second curved reflecting prism and a folding axis mirror; the light is transmitted by the first curved surface prism, reflected to the secondary reflector by the first curved surface reflection prism, transmitted by the second curved surface prism, reflected to the folding axis mirror by the second curved surface reflection prism, and finally converted to the detector assembly by the folding axis mirror for imaging; the first curved surface prism, the first curved surface reflection prism, the second curved surface reflection prism and the folding axis mirror are all arranged on the substrate through the flexible supporting device, and the secondary reflection mirror is arranged on the substrate through the reflection mirror supporting device.
Furthermore, the reflector supporting device comprises a secondary reflector bracket, a secondary reflector frame, a secondary reflector diaphragm, a secondary reflector frame trimming pad, a second precise measuring mirror assembly and a target mounting seat; the secondary reflector is arranged in the secondary reflector frame, the secondary reflector diaphragm, the secondary reflector frame and the secondary reflector frame trimming pad are sequentially arranged on one side of the secondary reflector bracket, and the plurality of target mounting seats are arranged on the other side of the secondary reflector bracket; the second accurate measurement mirror assembly is arranged at the top end of the secondary reflector support and used for monitoring the position posture and the space position of the secondary reflector, and the secondary reflector support is arranged on the substrate.
Furthermore, the coding assembly comprises a coding template, a coding pressing sheet and a coding support, a coding groove is formed in the coding support, a light through hole is formed in the bottom of the coding groove, the coding template is arranged in the coding groove through the coding pressing sheet, and light rays enter the imaging system after passing through the coding region and the light through hole of the coding template.
Furthermore, a plurality of auxiliary positioning point glue holes are formed in the coding pressing sheet, and the coding pressing sheet and the coding template are fixedly bonded through glue injection in the auxiliary positioning point glue holes, so that the influence of the coding pressing sheet on the surface shape of the coding template is reduced.
Furthermore, a first chamfer groove is formed in a corner of the prism mounting hole and used for avoiding assembly stress caused by incomplete back chipping of the curved prism structure frame; the corner of the coding groove is provided with a second chamfer groove to avoid incomplete back chipping to influence the surface shape of the coding template, the flexible piece is made of 4J32 material matched with the expansion coefficient of the curved prism, and the pressing piece is made of aluminum alloy 2A12 material.
Furthermore, an X-direction positioning boss and a plurality of second target mounting holes are arranged on the X side of the base plate and used for adjusting an X-direction reference, and a Y-direction positioning boss and a plurality of second target mounting holes are arranged on the Y side and used for adjusting a Y-direction reference.
Furthermore, the up end of base plate is provided with a plurality of installation bosss, coding subassembly, optical unit, detector subassembly and first accurate mirror subassembly all are connected with the installation boss of base plate through repairing the pad of cutting.
Further, the first precision measurement mirror assembly comprises a first precision measurement mirror, a first precision measurement mirror base, a first precision measurement mirror trimming pad and a first precision measurement mirror support; the first precision measurement lens is arranged on a first precision measurement lens base, the first precision measurement lens base is connected with a first precision measurement lens support through a first precision measurement lens trimming pad, and the first precision measurement lens support is arranged on the substrate; the second accurate survey mirror assembly includes that the second accurate survey mirror is trimmed and is cut pad, second accurate survey mirror base and second accurate survey mirror, the second accurate survey mirror passes through the second accurate survey mirror and repaiies the pad setting on the second accurate survey mirror base, the second accurate survey mirror base sets up the top at curved surface prism structure frame and secondary reflector mirror frame.
Further, the probe assembly includes a probe holder and a probe; the detector is arranged on a detector support, and the detector support is arranged on the substrate.
Compared with the prior art, the invention has the following technical effects:
1. the offner hyperspectral imaging system supports the square curved surface prism through the flexible supporting device, and the flexible supporting device can ensure that the large-caliber square curved surface prism has higher surface type precision and position precision in a complex force thermal environment. In addition, the flexible piece is arranged at the position of the curved surface prism structure frame, and a disassembly notch is formed, so that the flexible piece and the curved surface prism can be conveniently degummed out of the frame.
2. In the offner hyperspectral imaging system, except for the coding component, the second precise measuring mirror component is arranged at the top of each optical component, and meanwhile, a target mounting hole for mounting a laser tracker is reserved, so that the system can monitor the position posture and the space position of each optical part conveniently in the integrated assembly and adjustment stage.
3. According to the offner hyperspectral imaging system, all components are in modular design, and when the offner hyperspectral imaging system is installed and adjusted, all the components are installed and adjusted independently, and then all the components are installed on the substrate in an integrated mode, so that the difficulty of installation and adjustment is reduced.
4. The offner hyperspectral imaging system has compact structural design, can effectively adjust the position of each optical element, is provided with a trimming link between the optical element and the substrate, and can be used for adjusting two degrees of freedom of the pitching and the height of the optical element.
5. According to the offner hyperspectral imaging system, the first precise measuring mirror assembly is arranged on the substrate, the parallelism between the X, Y surface of the first precise measuring mirror assembly and the reference surface on the substrate X, Y side is less than 10 ", the reference of the hyperspectral assembly is led to the precise measuring mirror, and the position and the posture of each optical element can be conveniently monitored in the system integration and adjustment process.
6. The offner hyperspectral imaging system adopts the substrate to replace a box body structure, so that the assembly and adjustment space and the assembly and adjustment freedom degree are increased; the square curved surface prism is adopted to replace a circular curved surface prism, so that the difficulty of phase adjustment is reduced, and the fixation of each optical element component is facilitated.
Drawings
FIG. 1 is a schematic structural diagram of an offner hyperspectral imaging system based on a curved prism according to the invention;
FIG. 2 is a schematic diagram of the curved prism based offner hyperspectral optical system of the present invention;
FIG. 3 is a schematic structural diagram of an encoding component according to the present invention;
FIG. 4 is a schematic view of the structure of the coding support of the present invention;
FIG. 5 is a schematic diagram of a coded tablet of the present invention;
FIG. 6 is a schematic structural view of a first curved prism assembly according to the present invention;
FIG. 7 is a schematic structural diagram of a first curved prism according to the present invention;
FIG. 8 is a schematic structural diagram of a curved prism structure frame according to the present invention;
FIG. 9 is a schematic view of a flexure of the present invention;
FIG. 10 is a cross-sectional view of a first curved prism assembly according to the present invention;
FIG. 11 is a schematic diagram of a second precision mirror assembly according to the present invention;
FIG. 12 is a schematic view of the adjustment sequence of the first curved prism assembly according to the present invention;
FIG. 13 is a schematic view of a secondary mirror assembly according to the present invention;
FIG. 14 is a schematic view of a first precision mirror assembly according to the present invention;
FIG. 15 is a schematic view of a substrate according to the present invention.
Reference numerals: 1-an encoding component, 2-a first curved prism component, 3-a first curved reflecting prism component, 4-a secondary reflecting prism component, 5-a second curved prism component, 6-a second curved reflecting prism component, 7-a folding axis mirror component, 8-a detector component, 9-a first fine measuring mirror component, 10-a substrate, 11-an encoding template, 12-an encoding pressing sheet, 13-an encoding bracket, 121-an auxiliary positioning point glue hole, 122-a bracket mounting hole, 131-an encoding groove, 132-a light through hole, 133-a mounting hole, 134-a second chamfer groove, 21-a first curved prism, 22-a curved prism structure frame, 23-a flexible trimming pad, 24-a flexible clamping hoop, 25-a flexible piece, 26-a pressing sheet and 27-a laser tracker mounting seat, 28-second fine mirror assembly, 211-reference plane, 221-press mounting boss, 222-upper mounting boss, 223-adjustment hole, 224-lower mounting boss, 225-mounting interface, 226-first target mounting hole, 227-first chamfer groove, 228-prism mounting hole, 229-disassembly notch, 251-flexible member bonding area, 252-flexible groove, 253-glue injection hole, 281-second fine mirror, 282-second fine mirror base, 283-second fine mirror trimming pad, 31-first curved mirror, 51-second curved prism, 61-second curved mirror prism, 71-folding axis mirror, 41-secondary mirror, 42-secondary mirror support, 43-secondary mirror frame trimming pad, 44-secondary mirror frame, 45-secondary reflector diaphragm, 46-target mounting seat, 81-detector support, 82-detector, 91-first precision measurement mirror, 92-first precision measurement mirror base, 93-first precision measurement mirror trimming pad, 94-first precision measurement mirror support, 101-mounting boss, 102-X direction positioning boss, 103-second target mounting hole and 104-Y direction positioning boss.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
The offner hyperspectral imaging optical system based on the curved surface prism is a non-coaxial system, the structural design and the assembly and adjustment difficulty are high, and the structural design needs to be matched with an assembly and adjustment link to ensure the adjustment of multiple degrees of freedom of each optical element; meanwhile, the imaging quality of the imaging system in complex environments such as impact, vibration, high and low temperature change and the like is not affected. Based on the above, the invention provides an offner hyperspectral imaging system based on a curved prism, each optical element is installed in a mirror frame, and the axial interval, the inclination error and the eccentricity error of the optical element all meet the high-precision requirement. Meanwhile, the system designs a flexible part in the structural support of the optical element to buffer and release stress and strain so as to ensure that each optical element has higher surface shape precision and position precision under the mechanical environment such as impact and vibration and the like and the complex environment change such as high and low temperature change and the like.
As shown in fig. 1, the curved prism-based offner hyperspectral imaging system of the invention comprises a substrate 10, and an encoding assembly 1, an optical unit, a detector assembly 8 and a first fine measurement mirror assembly 9 which are arranged on the substrate 10; the light is incident to the optical unit through the encoding assembly 1, and the emergent light of the optical unit is incident to the detector assembly 8 for imaging. The detector assembly 8 comprises a detector support 81 and a detector 82, wherein the detector 82 is connected with the detector support 81 through screws, and the bottom of the detector support 81 is connected with the substrate 10 through screws.
As shown in fig. 3, 4 and 5, the coding assembly 1 of the present invention includes a coding template 11, a coding sheet 12 and a coding support 13, wherein the coding support 13 is fixedly disposed on the base plate 10, a coding groove 131 is disposed on the upper portion of the coding support 13, a light through hole 132 is disposed on the bottom of the coding groove 131, the coding template 11 is disposed in the coding groove 131 through the coding sheet 12, and the coding sheet 12 is fixed with a mounting hole 133 of the coding support 13 through a support mounting hole 122 by a screw. At this time, the light enters the imaging system through the coding region of the coding template 11 and the light-passing hole 132. In order to reduce the surface shape influence of the coding pressing sheet 12 on the coding template 11, a plurality of auxiliary positioning point glue holes 121 are formed in the coding pressing sheet 12, and glue is injected into the auxiliary positioning point glue holes 121 to bond and fix the coding pressing sheet 12 and the coding template 11. In addition, a second chamfer groove 134 is formed at a corner of the coding groove 131 to prevent the back chipping from affecting the surface shape of the coding template 11.
In the offner hyperspectral imaging system based on the curved surface prisms, the optical path in the optical unit is not limited as long as the imaging function can be realized, but the optical unit comprises a plurality of curved surface prisms, and the curved surface prisms are arranged on the substrate 10 through the flexible supporting device. As shown in fig. 2, in the embodiment of the present invention, the optical unit may specifically include a first curved prism 21, a first curved reflection prism 31, a secondary reflector 41, a second curved prism 51, a second curved reflection prism 61, and a folding axis mirror 71; the light rays are emitted into the imaging system through the coding template 11, are transmitted through the first curved surface prism 21 and reflected to the secondary reflector 41 through the first curved surface reflection prism 31, are transmitted through the second curved surface prism 51 and reflected through the second curved surface reflection prism 61, and are converted into a light path through the folding axis mirror 71 to be transmitted to the detector assembly 8 for imaging. At this time, the first curved prism 21, the first curved prism 31, the second curved prism 51, the second curved prism 61 and the folding axis mirror 71 are all disposed on the substrate 10 through the flexible supporting device, so as to form the first curved prism assembly 2, the first curved prism assembly 3, the second curved prism assembly 5, the second curved prism assembly 6 and the folding axis mirror assembly 7, and the secondary mirror 41 is mounted on the substrate 10 through the flexible supporting device of the mirror, so as to form the secondary mirror assembly 4. The arrangement enables all the components to be modularized, the components are installed and adjusted independently when being installed and adjusted, and then the components are installed on the base plate 10 of the components in an integrated mode, and the installing and adjusting difficulty is reduced.
As shown in fig. 6 and 7, the first curved prism assembly 2, the first curved reflecting prism assembly 3, the second curved prism assembly 5, the second curved reflecting prism assembly 6, and the folding axis mirror assembly 7 of the present invention have the same design concept, and the optical elements are fixed by using the flexible supporting device, so the first curved prism assembly 2 is taken as an example for extension, the first curved prism 21 is a square curved prism, the front and rear spherical surfaces of which are not coaxial, and when processing, the upper side and the lower side of the front end surface of the prism are processed with the reference plane 211 as the optical adjustment reference. The flexible supporting device comprises a curved prism structure frame 22, a plurality of flexible pieces 25 with the same structure, a plurality of flexible hoops 24 with the same structure, a plurality of flexible trimming pads 23 with the same structure, a plurality of pressing sheets 26 with the same structure, a plurality of laser tracker mounting seats 27 with the same structure and a second precision measuring lens assembly 28.
As shown in fig. 8, the curved prism structure frame 22 of the present invention has a prism mounting hole 228 formed therein, a plurality of pressing sheet mounting bosses 221 formed on a front end surface thereof, a plurality of removal notches 229 formed on a rear end surface thereof, and an upper mounting boss 222 and a lower mounting boss 224 formed on both left and right side surfaces thereof. The first curved prism 21 is arranged in the prism mounting hole 228, the front end surface of the first curved prism 21 is provided with a reference plane 211, and the plurality of pressing sheets 26 are respectively arranged on the pressing sheet mounting bosses 221 of the curved prism structure frame 22 through screws and are contacted with one side of the reference plane of the square curved prism during mounting, so as to be used for auxiliary positioning of the axial position of an optical part in the mounting and adjusting process. The height of each mounting boss 101 can be 1mm, and the flatness of the mounting bosses 101 is guaranteed to be within 0.01mm through grinding. The upper mounting boss 222 and the lower mounting boss 224 are specifically U-shaped bosses, the open ends of the U-shaped bosses are far away from the front end face of the curved prism structure frame 22, and the inner cavities of the U-shaped bosses are communicated with the dismounting notch 229; in order to facilitate the adjustment of the relative position relationship between the square curved surface prism and the curved surface prism structure frame 22, two adjusting holes 223 are respectively formed on each surface of the periphery of the curved surface prism structure frame 22, and the adjusting holes 223 can be specifically threaded holes of M8 fine teeth. In order to facilitate monitoring of the position and the posture of each optical component in the system integration adjustment stage, a mounting interface 225 is reserved at the top of the curved prism structure frame 22, and a plurality of first target mounting holes 226 are further formed in the front end face of the curved prism structure frame. Meanwhile, a first chamfer groove 227 is formed at a corner of the prism mounting hole 228, so that the optical-mechanical assembly stress caused by incomplete back chipping of the curved-surface prism structure frame 22 is avoided. In addition, the bottom of curved surface prism structure frame 22 still is provided with the installation base for carry out the stable stay to curved surface prism structure frame 22, still be provided with deep floor on the left surface and the right flank of curved surface prism structure frame 22, be used for increasing curved surface prism structure frame 22's intensity.
As shown in fig. 9 and 10, the flexible member 25 is a cylindrical structure, a plurality of flexible grooves 252 are formed in an outer wall of the cylindrical structure, and the plurality of flexible grooves 252 are uniformly distributed along a circumferential direction of the outer wall of the flexible member 25 and are arranged obliquely to an axis of the flexible member 25, so as to reduce the rigidity of the flexible member 25. The outer side of the cylinder bottom of the flexible piece 25 is provided with a groove for forming a flexible piece bonding area 251, the cylinder bottom is provided with an injection hole 253, and the flexible piece bonding area 251 is filled with epoxy resin glue EC2216-B/A through the injection hole 253. The width and angle of the flexible groove 252 of the flexible element 25 and the area of the flexible element bonding region 251 need to be optimized and obtained by finite element analysis according to the sizes and weights of different prisms with square curved surfaces. The flexible member 25 is mounted on the upper mounting boss 222 and the lower mounting boss 224 by the flexible trimming pad 23, and is fixedly connected to the curved prism structure frame 22 by a mounting flange provided on an outer circumferential surface thereof. The flexible piece 25 is bonded with the square curved prism through the epoxy resin adhesive at the flexible piece bonding area 251, and is fixedly connected with the curved prism structure frame 22 through a screw, the distance between the flexible piece 25 and the periphery of the square curved prism can be ensured by adjusting the thickness of the flexible trimming pad 23, and meanwhile, the bonding strength can be ensured by controlling the thickness of the adhesive layer.
The flexible clips 24 are respectively disposed in the detachment notches 229 at both sides of the curved prism structure frame 22, and are fixedly connected to the curved prism structure frame 22 by screws. If the glue injection error occurs, the surface shape of the curved surface prism is poor, the curved surface prism can be separated from the curved surface prism structure frame 22 by disassembling the flexible hoop 24, and the degumming treatment is carried out. Under the complex environments of impact, vibration or high and low temperature change and the like, the curved prism structure frame 22 buffers and releases the stress and strain of the environmental changes of the impact, the vibration and the like through the flexible piece 25, and avoids the influence on the work of the curved prism caused by the direct transmission of the changes of the impact, the vibration and the like generated by the environmental changes to the curved prism.
The flexible supporting device is provided with a plurality of first target mounting holes 226 on a curved prism structure frame 22, a plurality of laser tracker mounting seats 27 are mounted in the first target mounting holes 226 in a tight clearance fit mode, and at the moment, the laser trackers are mounted on the laser tracker mounting seats 27 and used for monitoring and adjusting the spatial position of a curved prism in a system integration assembly and adjustment stage.
As shown in fig. 11, the second fine measurement mirror assembly 28 of the present invention is disposed on the curved prism structure frame 22 through the mounting interface 225 disposed at the top end of the curved prism structure frame 22, so as to facilitate the monitoring of the position and posture of the curved prism during the system integration adjustment stage. Second fine measurement mirror assembly 28 includes second fine measurement mirror trim pad 283, second fine measurement mirror base 282 and second fine measurement mirror 281, and second fine measurement mirror 281 passes through second fine measurement mirror trim pad 283 to be set up on second fine measurement mirror base 282, and second fine measurement mirror base 282 passes through installation interface 225 and sets up on curved surface prism structure frame 22 top.
As shown in fig. 13, the mirror support device includes a sub-mirror support 42, a sub-mirror frame 44, a sub-mirror diaphragm 45, a sub-mirror frame trimming pad 43, a second precision mirror assembly 28, and a target mount 46; the secondary reflector 41 is fixedly connected with a secondary reflector frame 44 through a glue injection mode of a glue injection hole 253, a secondary reflector diaphragm 45, the secondary reflector frame 44 and a secondary reflector frame trimming pad 43 are sequentially arranged on one side of the secondary reflector bracket 42, and the target mounting seats 46 are in close clearance fit connection with the other side of the secondary reflector bracket 42; in the concrete connection, the sub-mirror frame 44, the sub-mirror frame trimming pad 43 and the sub-mirror support 42 are connected by screws, and the sub-mirror diaphragm 45 is connected with the sub-mirror frame 44 by screws. The sub-mirror holder 42 is provided on the substrate 10; the second fine mirror assembly 28 is disposed at the top end of the secondary mirror support 42.
As shown in fig. 14, the first fine mirror assembly 9 includes a first fine mirror 91, a first fine mirror mount 92, a first fine mirror trimming pad 93, and a first fine mirror holder 94; the first precise measurement lens 91 is arranged on the first precise measurement lens base 92 in an adhesive mode, the first precise measurement lens base 92 is connected with a first precise measurement lens support 94 through a first precise measurement lens trimming pad 93 through a screw, and the first precise measurement lens support 94 is arranged on the substrate 10; the X, Y face of the first precision measurement mirror assembly and the base plate X, Y side reference face are respectively less than 10' in parallelism, the reference of the hyperspectral assembly is led to the precision measurement mirror, and the position and the posture of each optical element are convenient to monitor in the system integration adjustment process.
The system is mainly used for monitoring the space angle of the hyperspectral imaging system when the offner hyperspectral imaging system is integrally assembled with other systems. And mounting a second precise measuring mirror assembly on the top of each optical assembly structure frame to be used as a monitoring reference of each assembly space angle. When the trimming pads between the assemblies and the substrate are trimmed, the change of the pitching and azimuth angles of the assemblies can be judged by monitoring the angle change of the precise measuring mirror, otherwise, the size of the trimming pad to be trimmed can be calculated according to the size of the space angle required to be adjusted. In addition, each subassembly structure frame all is provided with more than 3 target mounting holes and is used for installing the laser tracker, utilizes 3 points to confirm the spatial angle that the space angle of each subassembly can be fit out to the principle of a plane for supplementary second essence survey mirror subassembly measures the spatial angle.
As shown in fig. 15, the upper end surface of the base plate 10 is provided with a plurality of mounting bosses 101, and the encoder assembly 1, the optical unit, the detector assembly 8 and the first fine mirror assembly 9 are all connected with the mounting bosses 101 of the base plate 10 through trimming pads. The substrate 1010 is required to have good strength as a mounting surface of the whole hyperspectral module, and on the other hand, the substrate needs to be subjected to appropriate light weight treatment in order to reduce the weight of the device. An X-direction positioning boss 102 and 3 second target mounting holes 103 are arranged on the X side of the base plate 10 and used as an X-direction reference for adjustment, a Y-direction positioning boss 104 and a plurality of second target mounting holes 103 are arranged on the Y side of the base plate 10 and used as a Y-direction reference for adjustment, three second target mounting holes 103 are arranged on the front end face of the coding assembly 11 before installation, three laser trackers are installed in the second target mounting holes 103, and 3 points form a plane and are used for assisting adjustment of the space angle of the coding assembly. Three laser tracker target mounting holes and positioning bosses are reserved on two side faces perpendicular to the bottom face of the base plate, a plane is determined by three measuring points, the space angle of the side face A, B of the base plate can be fitted through the laser tracker, the positioning bosses serve as the datum for mounting the coding assembly 11 and are used for adjusting the space position of the coding assembly, and after the coding assembly is mounted, the coding assembly serves as the datum for mounting other optical assemblies and serves as the datum for system-level assembly and adjustment of the hyperspectral assembly.
In the aspect of material selection of the structure, the thermal expansion matching and light-weight design of the structural part and the optical part are mainly considered. The flexible part 25 in direct contact with the optical part is made of invar 4J32 material matched with the coefficient of linear expansion, the pressing sheet 26 which plays a role in axial auxiliary positioning is not directly adhered to the optical part, so that the aluminum alloy 2A12 material is selected, and the titanium alloy TC4 material is selected as the rest structural part material to ensure the strength and rigidity of the assembly.
As shown in fig. 12, the method for adjusting the first curved prism assembly of the present invention specifically includes the following steps:
firstly, repairing and grinding four pressing sheets 26, and putting the four pressing sheets into the curved surface prism structure frame 22 to ensure that the coplanarity of the four pressing sheets 26 is better than 0.02 mm;
step two, taking the four pressing sheets 26 as axis limiting references, installing the curved surface prism into the curved surface prism structure frame 22, and adjusting the mutual position relation between the curved surface prism structure frame 22 and the curved surface prism structure frame 22 through the process threaded hole of the M8 fine teeth on the curved surface prism structure frame to ensure that the curved surface prism and the curved surface prism structure frame 22 are symmetrically arranged up and down and left and right;
thirdly, repairing and grinding the thickness of the flexible trimming pad 23, and fixedly connecting the flexible piece 25 with the curved surface prism structure frame 22 through the flexible trimming pad 23;
step four, injecting connecting glue into the glue injection hole 253 of the flexible part 25 to ensure that the flexible part bonding area 251 is full of the connecting glue, and actually measuring the surface shape of the square curved surface prism after the connecting glue is cured to ensure that the optical design requirement is met;
fifthly, the four flexible hoops 24 are fixedly connected with the curved surface prism structure frame 22 through screws respectively, so that the strength and the rigidity of the assembly are enhanced;
and step six, fixedly connecting the four identical laser tracker mounting seats 27 and the precise measurement mirror assembly with the curved prism structure frame 22 in sequence, so as to facilitate the integrated assembly and adjustment of the auxiliary system.
Claims (10)
1. The utility model provides an offner hyperspectral imaging system based on curved surface prism which characterized in that: the device comprises a substrate (10), and an encoding component (1), an optical unit, a detector component (8) and a first precise measuring mirror component (9) which are arranged on the substrate (10);
light is incident to the optical unit through the coding assembly (1), and emergent light of the optical unit is incident to the detector assembly (8) for imaging; the optical unit comprises a plurality of curved prisms, and the curved prisms are arranged on a substrate (10) through a flexible supporting device; the first precise measurement mirror assembly (9) is used for monitoring the position and the posture of each lens in the optical unit in the installation and adjustment process;
the flexible supporting device comprises a curved prism structure frame (22), a flexible piece (25), a flexible hoop (24), a flexible trimming pad (23), a pressing sheet (26), a laser tracker mounting seat (27) and a second precise measuring lens assembly (28);
a prism mounting hole (228) is formed in the curved prism structure frame (22), a plurality of pressing sheet mounting bosses (221) and a plurality of first target mounting holes (226) are formed in the front end face of the curved prism structure frame, a plurality of dismounting notches (229) are formed in the rear end face of the curved prism structure frame, an upper mounting boss (222), a lower mounting boss (224) and a plurality of adjusting holes (223) are formed in the left side face and the right side face of the curved prism structure frame, the upper mounting boss (222) and the lower mounting boss (224) are both U-shaped bosses, the opening ends of the U-shaped bosses are far away from the front end face of the curved prism structure frame (22), and the inner cavities of the U-shaped bosses are; the adjusting hole (223) is used for adjusting the relative position of the curved surface prism and the curved surface prism structure frame (22);
the curved surface prism is arranged in the prism mounting hole (228), and a reference plane (211) is arranged on the front end surface of the curved surface prism; the pressing sheet (26) is arranged on the pressing sheet mounting boss (221), and the pressing sheet (26) is in contact with a reference plane (211) of the curved prism and used for realizing axial auxiliary positioning of the curved prism in the installation and adjustment process;
the flexible part (25) is of a cylinder structure, a plurality of flexible grooves (252) are formed in the outer wall of the flexible part (25) and used for reducing the rigidity of the flexible part (25), grooves are formed in the outer side of the cylinder bottom of the flexible part (25) and used for forming a flexible part bonding area (251), and a glue injection hole (253) is formed in the cylinder bottom and used for injecting connecting glue into the flexible part bonding area (251); the flexible part (25) is arranged on the upper mounting boss (222) and the lower mounting boss (224) through a flexible trimming pad (23), is adhered with the curved prism through a connecting glue of a flexible part adhering area (251), and the flexible clamping hoops (24) are respectively arranged in detaching notches (229) on two sides of the curved prism structure frame (22) and are fixedly connected with the curved prism structure frame (22);
the laser tracker mounting seat (27) is arranged in the first target mounting hole (226) and used for mounting a laser tracker, and the laser tracker is used for monitoring and adjusting the spatial position of the curved prism;
the second precision measurement mirror assembly (28) is arranged on the curved surface prism structure frame (22) through an installation interface (225) arranged at the top end of the curved surface prism structure frame (22) and used for monitoring the position posture of the curved surface prism.
2. An offner hyperspectral imaging system according to claim 1 wherein: the optical unit comprises a first curved surface prism (21), a first curved surface reflection prism (31), a secondary reflector (41), a second curved surface prism (51), a second curved surface reflection prism (61) and a folding axis mirror (71) which are sequentially arranged along an optical path; the first curved surface prism (21), the first curved surface reflection prism (31), the second curved surface prism (51), the second curved surface reflection prism (61) and the folding axis mirror (71) are all arranged on the substrate (10) through the flexible supporting device, and the secondary reflection mirror (41) is arranged on the substrate (10) through the reflection mirror supporting device.
3. An offner hyperspectral imaging system according to claim 2, wherein: the reflector supporting device comprises a secondary reflector bracket (42), a secondary reflector frame (44), a secondary reflector diaphragm (45), a secondary reflector frame trimming pad (43), a second precision measurement mirror assembly (28) and a target mounting seat (46); the secondary reflector (41) is arranged in a secondary reflector frame (44), the secondary reflector diaphragm (45), the secondary reflector frame (44) and a secondary reflector frame trimming pad (43) are sequentially arranged on one side of the secondary reflector bracket (42), and the target mounting seats (46) are arranged on the other side of the secondary reflector bracket (42); the second precise measurement mirror assembly (28) is arranged at the top end of the secondary mirror support (42) and used for monitoring the position posture and the space position of the secondary mirror (41), and the secondary mirror support (42) is arranged on the substrate (10).
4. An offner hyperspectral imaging system based on a curved prism as claimed in claim 1 or 2 or 3, wherein: the encoding assembly (1) comprises an encoding template (11), an encoding pressing sheet (12) and an encoding support (13), an encoding groove (131) is formed in the encoding support (13), a light through hole (132) is formed in the bottom of the encoding groove (131), the encoding template (11) is arranged in the encoding groove (131) through the encoding pressing sheet (12), and light enters the imaging system after passing through the encoding region and the light through hole (132) of the encoding template (11).
5. An offner hyperspectral imaging system according to claim 4, wherein: a plurality of auxiliary positioning point glue holes (121) are formed in the coding pressing sheet (12), glue is injected into the auxiliary positioning point glue holes (121) to bond and fix the coding pressing sheet (12) and the coding template (11), and therefore the surface shape influence of the coding pressing sheet (12) on the coding template (11) is reduced.
6. An offner hyperspectral imaging system according to claim 5 wherein: a first chamfer groove (227) is formed in the corner of the prism mounting hole (228) and used for avoiding assembly stress caused by incomplete back chipping of the curved prism structure frame (22); the corner of the coding groove (131) is provided with a second chamfer groove (134) for avoiding incomplete back chipping influence on the surface shape of the coding template (11), the flexible piece (25) is made of a 4J32 material matched with the expansion coefficient of the curved prism, and the pressing piece (26) is made of an aluminum alloy 2A12 material.
7. An offner hyperspectral imaging system according to claim 6 wherein: an X-direction positioning boss (102) and a plurality of second target mounting holes (103) are arranged on the X side of the base plate (10) and used for adjusting an X-direction reference, and a Y-direction positioning boss (104) and a plurality of second target mounting holes (103) are arranged on the Y side and used for adjusting a Y-direction reference.
8. An offner hyperspectral imaging system according to claim 7 wherein: the utility model discloses a light source module, including base plate (10), coding subassembly (1), optical unit, detector subassembly (8) and first accurate mirror subassembly (9), the up end of base plate (10) is provided with a plurality of installation bosss (101), coding subassembly (1), optical unit, detector subassembly (8) and first accurate mirror subassembly (9) all are connected with installation boss (101) of base plate (10) through trimming pad.
9. An offner hyperspectral imaging system according to claim 8 wherein: the first precision measurement mirror assembly (9) comprises a first precision measurement mirror (91), a first precision measurement mirror base (92), a first precision measurement mirror trimming pad (93) and a first precision measurement mirror support (94); the first precision measurement lens (91) is arranged on a first precision measurement lens base (92), the first precision measurement lens base (92) is connected with a first precision measurement lens support (94) through a first precision measurement lens trimming pad (93), and the first precision measurement lens support (94) is arranged on the substrate (10);
second accurate survey mirror assembly (28) include second accurate survey mirror trim pad (283), second accurate survey mirror base (282) and second accurate survey mirror (281), second accurate survey mirror (281) are passed through second accurate survey mirror trim pad (283) and are set up on second accurate survey mirror base (282), second accurate survey mirror base (282) set up the top at curved surface prism structure frame (22) and secondary reflector mirror frame (44).
10. An offner hyperspectral imaging system according to claim 9 wherein: the detector assembly (8) comprises a detector bracket (81) and a detector (82); the detector (82) is arranged on a detector support (81), and the detector support (81) is arranged on the substrate (10).
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| CN202010934707.5A CN112013954A (en) | 2020-09-08 | 2020-09-08 | Offner hyperspectral imaging system based on curved surface prism |
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