CN110470398B - Method for assembling and adjusting focusing-free interference spectrometer - Google Patents
Method for assembling and adjusting focusing-free interference spectrometer Download PDFInfo
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- CN110470398B CN110470398B CN201910671066.6A CN201910671066A CN110470398B CN 110470398 B CN110470398 B CN 110470398B CN 201910671066 A CN201910671066 A CN 201910671066A CN 110470398 B CN110470398 B CN 110470398B
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
In order to solve the technical problem of higher difficulty in ground installation and adjustment of the focusing-free interferometer, the invention provides an installation and adjustment method of the focusing-free interferometer, which comprises the following steps: 1) designing and processing a trimming pad among the components; 2) each component is independently adjusted; 3) under the ground air environment, all the components and the corresponding trimming pads are integrated, assembled and adjusted; 4) presetting a vacuum image surface; 5) curing and assembling precision; 6) and (5) verifying the performance. According to the method, the difficulty in ground installation and adjustment of a non-focusing interferometer is greatly reduced, the accuracy consistency of the non-focusing interferometer in a space environment and a ground air environment is improved, and the installation and adjustment period is shortened; after the installation and adjustment are completed in the ground air environment, the optical indexes of the non-focusing interference spectrometer can meet the design requirements after the non-focusing interference spectrometer is subjected to an emission stage and is in orbit by combining a vacuum image surface presetting method and a mechanical simulation test.
Description
Technical Field
The invention belongs to the field of aerospace optics, and relates to an installation and adjustment method of a non-focusing interference spectrometer.
Background
The principle of the interference imaging spectrometer is that light of a target object is divided into two beams, and the two beams of light meet at a photosensitive element to generate interference by controlling the optical path difference of the two beams of light, so that a series of interference patterns obtained by different optical path differences are obtained; and carrying out a series of processing and inversion on the interference pattern to obtain the three-dimensional information of the image spectrum of the target object, namely the spectrum curve of each point of the target object. The early interferometric imaging spectrometer is mostly developed based on a michelson interferometer, and a set of high-precision moving mirror driving system is arranged in the interferometer, so that the interferometer is called as a time modulation interferometric imaging spectrometer. In practical applications, the time-modulated interferometric imaging spectrometer suffers from two major disadvantages: firstly, the moving mirror is required to move at a constant speed, and the requirements on inclination and shaking are strict; secondly, the movable mirror is required to move for a period to finish sampling the interference pattern, so that the method is not suitable for rapid change spectrum measurement.
With the development of an area array detector, a spatial modulation interference imaging spectrum technology is well applied, and the scheme is adopted in many space cameras in orbit at present. The spatial modulation interference spectrometer can be divided into a focusing interference spectrometer and a non-focusing interference spectrometer according to different focal plane adjusting modes. Since the space satellite and the load on the satellite experience complex space environments such as overweight, weightlessness, vibration, impact and the like in the processes of launching the satellite, separating the rocket, performing orbital transfer flight and the like, compared with a focusing interference spectrometer, the focusing interference-free spectrometer does not need to be designed with a complex high-precision focusing mechanism, so that uncertain conditions such as clamping, loosening and the like of the focusing mechanism can not be caused in the complex space environment, and the stability of the spectrometer is greatly improved. However, for an adjustable focus interference spectrometer, for example, the non-focus interference spectrometer disclosed in application No. 201610915937.0, since the focus surface position cannot be adjusted according to the actual situation of the spectrometer in the space environment, the difference between the ground environment and the space environment of the spectrometer must be considered in the ground assembly process, and the optical index verified on the ground is ensured to be consistent with the space environment by adopting an effective assembly and adjustment method, which greatly increases the difficulty in ground assembly and adjustment.
Disclosure of Invention
In order to solve the technical problem that the ground installation and adjustment difficulty of a non-focusing interferometer is high, the invention provides an installation and adjustment method of a non-focusing interferometer.
The invention conception of the invention is as follows:
the method firstly carries out the blocking assembly and the adjustment of each component in the non-focusing interference spectrometer, then carries out the unified assembly and the adjustment, and simultaneously completes the assembly of the non-focusing interference spectrometer by matching with a vacuum image surface presetting method and a mechanical simulation test.
The technical scheme of the invention is as follows:
the installation and adjustment method of the non-focusing interference spectrometer comprises a front telescope component, a support box body, a collimating mirror component, an interferometer component, a Fourier mirror component and a focal plane component;
it is characterized in that the device is characterized in that,
the method comprises the following steps:
1) designing and processing a front telescopic assembly trimming pad between the front telescopic assembly and the support box body, designing and processing a collimating mirror assembly trimming pad between the collimating mirror assembly and the support box body, designing and processing an interferometer assembly trimming pad between the interferometer assembly and the support box body, designing and processing a Fourier mirror assembly trimming pad between the Fourier mirror assembly and the support box body, and designing and processing a coke face assembly trimming pad between the coke face assembly and the support box body;
2) respectively and independently adjusting the front telescope assembly, the collimating mirror assembly, the interferometer assembly, the Fourier mirror assembly and the focal plane assembly;
3) in the ground air environment, the front telescope component, the collimating mirror component, the interferometer component, the Fourier mirror component, the focal plane component and the corresponding trimming pads which are separately assembled and adjusted are uniformly integrated and adjusted;
4) performing vacuum image surface presetting on the uniformly integrated and adjusted non-focusing interference spectrometer;
5) curing and assembling precision;
6) and (5) verifying the performance.
Further, the step 2) is specifically as follows:
2.1) independently assembling the front telescopic assembly to ensure that the optical transfer function, the focal length and the rear intercept meet the optical design requirements;
2.2) centering the front telescope component supporting lens cone to ensure that the coaxiality of a mechanical central shaft of an assembly circumferential surface of the front telescope component supporting lens cone and an optical axis of an optical system of the front telescope component and the verticality of an assembly flange surface of the front telescope component supporting lens cone and the optical axis of the optical system of the front telescope component meet optical design requirements;
2.3) independently assembling the alignment straight mirror assembly to ensure that the optical transfer function, the focal length and the transmittance of the alignment straight mirror assembly meet the optical design requirements;
2.4) centering the alignment lens cone to ensure that the coaxiality of the mechanical central shaft of the assembly circumferential surface of the collimating mirror assembly and the optical axis of the optical system of the collimating mirror assembly and the verticality of the assembly flange surface of the alignment lens cone and the optical axis of the optical system of the collimating mirror assembly meet the optical design requirements;
2.5) independently assembling the Fourier lens assembly to ensure that the optical transfer function, the focal length and the transmittance of the Fourier lens assembly meet the optical design requirements;
2.6) centering the Fourier lens cone, and ensuring that the coaxiality of the mechanical central axis of the assembling circumferential surface of the Fourier lens assembly and the optical axis of the optical system of the Fourier lens assembly and the verticality of the assembling flange surface of the Fourier lens cone and the optical axis of the optical system of the Fourier lens assembly meet the optical design requirements;
2.7) independently assembling the interferometer assembly to ensure that the perpendicularity of an incident light axis of the interferometer assembly and an emergent light axis of the interferometer assembly, the perpendicularity of the incident light axis of the interferometer assembly and an incident light surface of the interferometer assembly, and the perpendicularity of the emergent light axis of the interferometer assembly and the emergent light surface of the interferometer assembly meet optical design requirements;
2.8) independently assembling the focal plane assembly to ensure that the parallelism between a detector photosensitive surface of the focal plane assembly and a flange surface of a structural frame of the focal plane assembly meets the optical design requirement;
2.9) carrying out one-time processing on the supporting box body, and ensuring that the coaxiality, the verticality and the parallelism of an assembly flange surface and an assembly circumferential surface for assembling each component on the supporting box body all meet the design requirements.
Further, the step 3) is specifically as follows:
3.1) assembling the interferometer assembly and the interferometer assembly trimming pad in the supporting box body, adjusting the thickness of the interferometer assembly trimming pad, and adjusting the relative position of the interferometer assembly and the supporting box body;
3.2) assembling the collimating mirror assembly and the collimating mirror assembly trimming pad in the supporting box body;
3.3) assembling the Fourier mirror assembly and the Fourier mirror assembly trimming pad in the supporting box body;
3.4) assembling the focal plane assembly and the focal plane assembly trimming pad in the supporting box body, and adjusting the inclination of the interferometer assembly trimming pad;
3.5) adjusting the thickness and the gradient of the focal plane assembly trimming pad;
3.6) mounting the front telescopic assembly on the supporting box body, and determining the thickness of the trimming pad of the front telescopic assembly;
3.7) adjusting the relative position of the focal plane component and the supporting box body.
Further, the step 3.1) is specifically as follows:
firstly, assembling an interferometer component and an interferometer component trimming pad in a supporting box body, and adjusting the thickness of the interferometer component trimming pad to ensure that the distance between an optical axis plane formed by an incident optical axis of the interferometer component and an emergent optical axis of the interferometer component and an installation reference plane of the interferometer component in the supporting box body is the same as the distance between a central axis plane formed by a mechanical central axis of an assembly circumferential surface of the collimator component used for installing the collimator component on the supporting box body and a mechanical central axis of an assembly circumferential surface of a Fourier component used for installing the Fourier component on the supporting box body and the installation reference plane of the interferometer component in the supporting box body;
then, two theodolites are respectively arranged in front of an incident light surface of the interferometer component and in front of an emergent light surface of the interferometer component, the two theodolites are mutually self-aligned, the angles of the incident light surface of the interferometer component and the emergent light surface of the interferometer component are respectively monitored by the two theodolites, the verticality between an incident light axis of the interferometer component and a collimator component assembling flange surface used for installing a collimator component on a supporting box body meets the optical design requirement by adjusting the relative positions of the interferometer component and the supporting box body, the coaxiality between the incident light axis of the interferometer component and a mechanical central axis of a collimator component assembling circumferential surface used for installing the collimator component on the supporting box body meets the optical design requirement, the verticality between the emergent light axis of the interferometer component and a Fourier component assembling flange surface used for installing the Fourier component on the supporting box body meets the optical design requirement, and the emergent light axis of the interferometer component and the Fourier component assembling flange surface used for installing The coaxiality of the circumferential mechanical central shaft meets the optical design requirement.
Further, the step 3.4) is specifically as follows:
firstly, assembling a focal plane assembly on a supporting box body, and installing a focal plane assembly trimming pad between the focal plane assembly and the supporting box body;
then, an integrating sphere is placed at the front end of the collimating mirror assembly, a plumb line is suspended in a light path between the integrating sphere and the collimating mirror assembly, an included angle between an image of the plumb line on the focal plane assembly and an interference fringe formed by the image of the plumb line on the focal plane assembly is monitored, the gradient of a trimming pad of the interferometer assembly is adjusted, and when the included angle between the image of the plumb line on the focal plane assembly and the interference fringe formed by the image of the plumb line on the focal plane assembly is 90 degrees, the adjustment is completed.
Further, the step 3.5) is specifically as follows:
firstly, detaching a collimating mirror assembly and a collimating mirror assembly trimming pad from a supporting box body, carrying out a focus scanning test on a spectrometer in the state, and determining the optimal position of a focal plane assembly so as to determine the thickness of the focal plane assembly trimming pad;
then, monitoring the consistency of the gray values of the boundaries at the two ends of the image of the target strip plate on the focal plane assembly, adjusting the inclination of the focal plane assembly, and finishing the adjustment when the gray values of the boundaries at the two ends of the image of the target strip plate on the focal plane assembly are consistent, thereby determining the inclination of the trimming pad of the focal plane assembly;
finally, machining the focal plane assembly trimming pad according to the thickness and the gradient of the focal plane assembly trimming pad determined above, installing the machined focal plane assembly and the focal plane assembly trimming pad on a supporting box body, testing the consistency of the optical transfer function of the spectrograph and the gray values of the fringe plate target at the boundaries of two ends of the image formed on the focal plane assembly in the state, and completing the installation and adjustment of the focal plane assembly if the test data meets the optical design requirement; and if the test data does not meet the optical design requirement, readjusting the thickness and the gradient of the trimming pad of the focal plane assembly according to the steps until the consistency of the optical transfer function of the spectrometer and the gray values of the fringe plate target at the boundaries of two ends of the image formed on the focal plane assembly meets the optical design requirement.
Further, in step 3.5), the thickness of the focal plane assembly trimming pad to be adjusted is determined according to the following method:
firstly, under the condition that a non-focusing interference spectrometer is not provided with a front telescope component, a front telescope component trimming pad and a collimating mirror component, a collimator tube is arranged at the front end of an incident light surface of the interferometer component, and a target of a streak plate is arranged at the end target position of the collimator tube; connecting the focal plane assembly with a computer provided with imaging software, calculating an optical transfer function of the non-focusing interference spectrometer through a black and white fringe image formed by the target of the fringe plate in the imaging software of the computer, wherein the maximum position of the optical transfer function of the non-focusing interference spectrometer is the optimal focal plane position;
then, the target of the streak plate is moved back and forth through the focal length f of the collimator1Design focal length f of focusing-free interference spectrometer2And a movement distance Deltax when the target of the streak plate moves from the initial position to the optimal focal plane position1Calculating the amount of the focal plane assembly trimming pad to be adjusted Deltax2。
Further, the step 3.6) is specifically:
firstly, mounting a front telescopic assembly on a supporting box body, determining the optimal position of the front telescopic assembly through a focus sweeping test, thereby preliminarily determining the thickness of a trimming pad of the front telescopic assembly, and processing the trimming pad of the front telescopic assembly according to the thickness;
then, mounting the front telescopic assembly and the machined front telescopic assembly trimming pad on a supporting box body, testing the optical transfer function of the spectrometer in the state, and completing the assembly and adjustment of the front telescopic assembly if the tested optical transfer function meets the optical design requirements; if the tested optical transfer function does not meet the optical design requirement, the thickness of the front telescope component trimming pad is readjusted according to the steps until the optical transfer function of the spectrometer meets the optical design requirement in the state.
Further, in step 3.6), the thickness of the front telescopic assembly trimming pad to be adjusted is determined according to the following method:
firstly, under the state that a non-focusing interference spectrometer is provided with a front telescope component, a front telescope component trimming pad and a collimating mirror component, a collimator is arranged at the front end of the front telescope component, a streak plate target is arranged at the end target position of the collimator, a focal plane component is connected with a computer provided with imaging software, the optical transfer function of the non-focusing interference spectrometer is calculated through black and white streak images formed by the streak plate target in the imaging software of the computer, and the maximum position of the optical transfer function of the non-focusing interference spectrometer is the optimal focal plane position;
then, the target of the streak plate is moved back and forth through the system focal distance f of the collimator1System design focal length f of focusing-free interference spectrometer2And a movement distance Deltax 'when the target of the streak plate moves from the initial position to the optimal focal plane position'1Calculating the amount delta x 'of the front telescope trim pad to be adjusted'2。
Further, the step 4) is specifically as follows:
4.1) calculating the thickness of the front telescopic assembly trimming pad, the thickness of the collimating mirror assembly trimming pad, the thickness of the interferometer assembly trimming pad, the thickness of the Fourier mirror assembly trimming pad and the thickness of the focal plane assembly trimming pad in the vacuum environment according to the thickness of the front telescopic assembly trimming pad, the thickness of the collimating mirror assembly trimming pad, the thickness of the Fourier mirror assembly trimming pad and the thickness of the focal plane assembly trimming pad in the ground air environment determined in the process of installing and adjusting the ground, and processing a corresponding vacuum pad according to the calculated thicknesses;
4.2) after a trimming pad in the non-focusing interference spectrometer is replaced by a corresponding vacuum pad, performing a thermal vacuum test, and measuring an optical transfer function of the non-focusing interference spectrometer in a space vacuum environment;
4.3) if the tested optical transfer function is consistent with the optical design value, the vacuum image plane is accurately preset; if the tested optical transfer function is not consistent with the optical design value, the vacuum image surface presetting is proved to be inaccurate, the calculation data in the step 4.1) needs to be rechecked and recalculated, the thicknesses of the front telescope component trimming pad, the collimating mirror component trimming pad, the Fourier mirror component trimming pad and the focal plane component trimming pad are readjusted, the thermal vacuum test is carried out again after the adjustment, and the process is repeated until the tested optical transfer function is consistent with the tested data in the ground environment.
The invention has the advantages that:
according to the method, the difficulty in ground installation and adjustment of a non-focusing interferometer can be greatly reduced, the accuracy consistency of the non-focusing interferometer in a space environment and a ground air environment is improved, and the installation and adjustment period is shortened; after the installation and adjustment are completed in the ground air environment, the optical indexes of the non-focusing interference spectrometer can meet the design requirements after the non-focusing interference spectrometer is subjected to an emission stage and is in orbit by combining a vacuum image surface presetting method and a mechanical simulation test.
Drawings
Fig. 1 is a schematic structural diagram of a prior art focusing-free interference spectrometer.
FIG. 2 is a schematic diagram of a prior art disclosed non-focusing interference spectrometer.
FIG. 3 is a schematic view of the mounting relationship of the interferometer assembly to the support housing.
FIG. 4 is a schematic diagram of the interferometer assembly setup principle.
FIG. 5 is a schematic diagram of a trimming pad adjustment test principle of an interferometer assembly.
FIG. 6 is a schematic diagram of the focal plane assembly trimming pad adjustment test principle.
FIG. 7 is a schematic view of the adjustment test principle of the front telescopic assembly trimming pad.
FIG. 8 is a schematic diagram illustrating the principle of the adjustment test of the relative position between the focal plane assembly and the supporting box.
Description of reference numerals:
1-a front telescope assembly; 101-a front telescope assembly supporting barrel; 102-a front telescope assembly trimming pad; 2-supporting the box body; 201-supporting an interferometer component installation datum plane in a box body; 3-a collimator mirror assembly; 301-a collimating lens barrel; 302-collimator mirror assembly trim pad; 231-collimator lens assembly mounting flange face; 232-collimator lens assembly mounting circumference; 4-an interferometer assembly; 41-an incident surface of the interferometer assembly; 42-an exit light surface of the interferometer assembly; 43-an interferometer assembly incident optical axis; 44-an interferometer assembly exit optical axis; 401-interferometer assembly trim pad; 402-long arm mirror; a 5-Fourier mirror assembly; 501-Fourier lens cone; a 251-Fourier mirror assembly mounting flange face; 252-fourier mirror assembly mounting circumference; 502-foucault mirror assembly trim pad; 6-a focal plane assembly; 601-focal plane assembly structure frame; 602-focal plane assembly trim pad; 7-theodolite; 8-an integrating sphere; 9-plumb line; 10-a collimator; 11-a striped plate target; 12-a grating ruler; 13-computer.
Detailed Description
As shown in fig. 1 and 2, the interferometer is a schematic structural diagram and a schematic principle diagram of a conventional and disclosed non-focusing interferometer, and includes a front telescope assembly 1, a support box 2, a collimator mirror assembly 3, an interferometer assembly 4, a fourier mirror assembly 5 and a focal plane assembly 6.
The invention adjusts the non-focusing interference spectrometer shown in the figure 1 according to the following method:
firstly, designing trimming pads among all components of a non-focusing interference spectrometer:
as shown in fig. 1 and 2, at the beginning of designing the non-focusing interference spectrometer, a front telescope assembly trimming pad 102 is designed and processed between a front telescope assembly 1 and a support box 2, a collimator assembly trimming pad 302 is designed and processed between a collimator assembly 3 and the support box 2, an interferometer assembly trimming pad 401 is designed and processed between an interferometer assembly 4 and the support box 2, a fourier assembly trimming pad 502 is designed and processed between a fourier assembly 5 and the support box 2, and a focal plane assembly trimming pad 602 is designed and processed between a focal plane assembly 6 and the support box 2; the collimator mirror assembly trimming pad 302, the interferometer assembly trimming pad 401, the foucault mirror assembly trimming pad 502 and the focal plane assembly trimming pad 602 are used to adjust the spacing of the respective assemblies from the support box and to adjust the optical pointing of the respective assemblies, respectively.
Secondly, each component of the non-focusing interference spectrometer is separately assembled and adjusted in a blocking mode:
step 2.1, independently assembling the front telescopic assembly 1 to ensure that the optical transfer function, the focal length and the rear intercept meet the optical design requirements;
and 2.2, after the front telescopic assembly 1 is assembled, centering the front telescopic assembly supporting lens barrel 101, and ensuring that the coaxiality of the mechanical central shaft of the assembling circumferential surface of the front telescopic assembly supporting lens barrel 101 and the optical axis of the optical system of the front telescopic assembly and the verticality of the assembling flange surface of the front telescopic assembly supporting lens barrel 101 and the optical axis of the optical system of the front telescopic assembly meet the optical design requirements.
And 2.3, independently assembling the alignment straight mirror assembly 3 to ensure that the optical transfer function, the focal length and the transmittance of the alignment straight mirror assembly meet the optical design requirements.
And 2.4, after the collimating mirror assembly 3 is assembled, centering the collimating mirror assembly support lens barrel, namely the collimating lens barrel 301, so that the coaxiality of the mechanical central shaft of the collimating mirror assembly assembling circumferential surface 232 and the optical axis of the optical system of the collimating mirror assembly 3 and the verticality of the assembling flange surface of the collimating lens barrel 301 and the optical axis of the optical system of the collimating mirror assembly 3 can meet the optical design requirements.
And 2.5, independently assembling the Fourier mirror assembly 5 to ensure that the optical transfer function, the focal length and the transmittance of the Fourier mirror assembly meet the optical design requirements.
And 2.6, after the Fourier lens assembly 5 is assembled, centering the Fourier lens assembly support lens barrel, namely the Fourier lens barrel 501, so that the coaxiality of the mechanical central shaft of the assembling circumferential surface 252 of the Fourier lens assembly and the optical axis of the optical system of the Fourier lens assembly 5 and the verticality of the assembling flange surface of the Fourier lens barrel 501 and the optical axis of the optical system of the Fourier lens assembly 5 can meet the optical design requirement.
And 2.7, independently assembling the interferometer assembly 4, and adjusting the angles of the two long-arm reflectors 402 in the interferometer assembly 4 to ensure the perpendicularity of the incident light axis 43 of the interferometer assembly and the emergent light axis 44 of the interferometer assembly, ensure the perpendicularity of the incident light axis 43 of the interferometer assembly and the incident light surface 41 of the interferometer assembly, and ensure that the perpendicularity of the emergent light axis 44 of the interferometer assembly and the emergent light surface 42 of the interferometer assembly meets the optical design requirement.
And 2.8, independently assembling the focal plane assembly 6, and ensuring that the parallelism between the detector photosensitive surface of the focal plane assembly 6 and the flange surface of the focal plane assembly structure frame 601 meets the optical design requirement.
And 2.9, carrying out primary processing on the supporting box body 2, wherein the primary processing refers to processing the assembly flange surfaces and the assembly circumferential surfaces of the components (the front telescopic component 1, the collimating mirror component 3, the interferometer component 4, the Fourier mirror component 5 and the focal plane component 6) on the supporting box body 2 under the condition of primary clamping so as to avoid the influence on the processing precision due to the conversion reference, and the coaxiality, the verticality and the parallelism of the assembly flange surfaces and the assembly circumferential surfaces for assembling the components on the supporting box body 2 all meet the design requirements.
Thirdly, under the ground air environment, the components which are independently assembled and adjusted are integrated and adjusted in a unified way:
step 3.1, assembling the interferometer assembly 4 and the interferometer assembly trimming pad 401 in the supporting box body 2, adjusting the thickness of the interferometer assembly trimming pad 401, and adjusting the relative position of the interferometer assembly 4 and the supporting box body 2:
firstly, the interferometer assembly 4 and the interferometer assembly trimming pad 401 are assembled in the supporting box body 2, and the distance between the optical axis plane formed by the incidence optical axis 43 of the interferometer assembly and the emergence optical axis 44 of the interferometer assembly and the mounting reference plane 201 of the interferometer assembly in the supporting box body is adjusted by adjusting the thickness of the interferometer assembly trimming pad 401, and the distance between the central axis plane formed by the mechanical central axis of the collimator assembly assembling circumferential surface 232 on the supporting box body 2 for mounting the collimator assembly 3 and the mechanical central axis of the Fourier lens assembly assembling circumferential surface 252 on the supporting box body 2 for mounting the Fourier lens assembly 5 and the mounting reference plane 201 of the interferometer assembly in the supporting box body is the same.
Then, as shown in fig. 4, two theodolites 7 are respectively arranged in front of the incident light surface 41 of the interferometer component and in front of the emergent light surface 42 of the interferometer component, and the two theodolites 7 are mutually self-aligned, the angles of the incident light surface 41 of the interferometer component and the emergent light surface 42 of the interferometer component are respectively monitored by the two theodolites 7, and by adjusting the relative positions of the interferometer component 4 and the support box 2, the verticality of the incident light axis 43 of the interferometer component and the assembling flange surface 231 of the collimator component, which is used for installing the collimator component 3, on the support box 2 meets the optical design requirement, and the coaxiality of the incident light axis 43 of the interferometer component and the mechanical central axis of the assembling circumferential surface 232 of the collimator component, which is used for installing the collimator component 3, on. The perpendicularity of the exit optical axis 44 of the interferometer component and the assembling flange surface 251 of the Fourier mirror component for mounting the Fourier mirror component 5 on the supporting box body 2 meets the optical design requirement, and the coaxiality of the exit optical axis 44 of the interferometer component and the mechanical central axis of the assembling circumferential surface 252 of the Fourier mirror component for mounting the Fourier mirror component 5 on the supporting box body 2 meets the optical design requirement.
Step 3.2, assembling the collimating mirror assembly 3 and the collimating mirror assembly trimming pad 302 in the supporting box body 2:
the collimator lens assembly 3 is mounted on the support housing 2, and a collimator lens assembly trim pad 302 is mounted between the collimator lens assembly 3 and the support housing 2. The thickness value of the trimming pad 302 of the collimating mirror assembly is the theoretical value of the optical design, and the thickness is directly used for assembly without thickness adjustment in the assembly step.
Step 3.3, assembling the Fourier mirror assembly 5 and the Fourier mirror assembly trimming pad 502 in the support box body 2:
the foucault assembly 5 is mounted on the support case 2, and a foucault assembly trimming pad 502 is mounted between the foucault assembly 5 and the support case 2. The fourier mirror assembly trimming pad 502 thickness value is the optical design theoretical value, and is directly used for assembly without thickness adjustment in the assembly step.
Step 3.4, assembling the focal plane assembly 6 and the focal plane assembly trimming pad 602 in the supporting box body 2, and adjusting the inclination of the interferometer assembly trimming pad 401:
firstly, assembling the focal plane assembly 6 on the supporting box body 2, and installing a focal plane assembly trimming pad 602 between the focal plane assembly 6 and the supporting box body 2, wherein the assembling of the focal plane assembly 6 in the step is initial assembling, and the thickness value of the focal plane assembly trimming pad 602 is an optical design theoretical value.
Then, as shown in fig. 5, an integrating sphere 8 is placed at the front end of the collimator lens assembly 3, a plumb line 9 is suspended in a light path between the integrating sphere 8 and the collimator lens assembly 3, an included angle between an image of the plumb line 9 on the focal plane assembly 6 and an image of an interference fringe is monitored through a computer 13, the inclination of the interferometer assembly trimming pad 401 is adjusted, and when the included angle between the image of the plumb line 9 on the focal plane assembly 6 and the interference fringe is 90 °, the adjustment is completed.
Step 3.5, adjusting the thickness and the inclination of the focal plane assembly trimming pad 602:
firstly, detaching the collimating mirror assembly 3 and the collimating mirror assembly trimming pad 302 from the supporting box body 2, carrying out a focus sweeping test on the spectrometer in the state, and determining the optimal position of the focal plane assembly 6, thereby determining the thickness of the focal plane assembly trimming pad 602;
then, the consistency of the gray values of the boundaries of the two ends of the image of the target 11 on the focal plane assembly 6 is monitored by the computer 13, the inclination of the focal plane assembly 6 is adjusted, and when the gray values of the boundaries of the two ends of the image of the target 11 on the focal plane assembly 6 are consistent, the adjustment is completed, so that the inclination of the focal plane assembly trimming pad 602 is determined.
And (3) processing the focal plane assembly trimming pad 602 according to the thickness and the gradient of the focal plane assembly trimming pad 602 determined by the method, then mounting the focal plane assembly 6 and the focal plane assembly trimming pad 602 on the supporting box body 2, and testing the optical transfer function of the spectrometer and the consistency of the gray values of the fringe plate target 11 at the boundaries of two ends imaged on the focal plane assembly 6 in the state. If the test data meets the optical design requirements, the adjustment of the focal plane assembly 6 is completed, and the subsequent steps can be entered to continue the subsequent adjustment of the spectrometer, i.e. the step 3.6 is entered. If the test data does not meet the optical design requirement, the thickness and the gradient of the focal plane assembly trimming pad 602 are readjusted according to the above steps until the consistency of the optical transfer function of the spectrometer and the gray values of the two end boundaries of the imaged fringe plate target 11 on the focal plane assembly 6 in this state meets the optical design requirement.
In this step, the thickness of the focal plane assembly trimming pad 602 to be adjusted is determined according to the following method (see fig. 6):
firstly, in the state that a front telescope component 1, a front telescope component trimming pad 102 and a collimator component 3 are not installed on a non-focusing interference spectrometer, a collimator 10 is placed at the front end of an incident light surface 41 of the interferometer component, a striped plate target 11 is placed at a target position at the end part of the collimator 10 (the position is the focal plane position of the collimator 10), the striped plate target 11 can move back and forth along the optical axis direction of the collimator 10, and the moving distance is obtained through a high-precision grating ruler 12; connecting the focal plane assembly 6 with a computer 13, wherein imaging software is installed on the computer 13, and calculating an optical transfer function of the non-focusing interference spectrometer through a black-and-white fringe image formed by the fringe plate target 11 in the imaging software of the computer 13, wherein the maximum position of the optical transfer function of the non-focusing interference spectrometer is the optimal focal plane position;
then, the target 11 is moved back and forth through the focal length f of the collimator 101Design focal length f of focusing-free interference spectrometer2And a moving distance Deltax when the target 11 is moved from the initial position to the best focal plane position1Three data, calculate the amount Δ x that the focal plane assembly trim pad 602 needs to be adjusted2。
Step 3.6, mounting the front telescopic assembly 1 on the supporting box body 2, and determining the thickness of the front telescopic assembly trimming pad 102:
firstly, mounting a front telescopic assembly 1 on a supporting box body 2, determining the optimal position of the front telescopic assembly 1 through a focus sweeping test, thereby preliminarily determining the thickness of a front telescopic assembly trimming pad 102, and processing the front telescopic assembly trimming pad 102 according to the thickness;
then, the front telescopic assembly 1 and the machined front telescopic assembly trimming pad 102 were mounted on the support case 2, and the optical transfer function of the spectrometer in this state was tested.
If the tested optical transfer function meets the optical design requirement, the adjustment of the front telescope component 1 is completed, and the adjustment of the spectrometer can be continuously carried out according to the subsequent steps, namely, the step four is carried out. If the tested optical transfer function does not meet the optical design requirement, the thickness of the front telescope assembly trimming pad 102 is readjusted according to the above steps until the optical transfer function of the spectrometer meets the optical design requirement in this state. And after the assembling steps are completed, the assembling of the non-focusing interference spectrometer in the ground air environment is completed.
In this step, the thickness of the anterior telescope assembly trimming pad 102 to be adjusted is determined in the following manner (see fig. 7):
firstly, under the state that a non-focusing interference spectrometer is provided with a front telescope component 1, a front telescope component trimming pad 102 and a collimator component 3, a collimator 10 is arranged at the front end of the front telescope component 1, a striped plate target 11 is arranged at the target position at the end part of the collimator 10 (the position is the focal plane position of the collimator 10), the striped plate target 11 can move back and forth along the optical axis direction of the collimator 10, and the moving distance is obtained through a high-precision grating ruler 12; connecting a focal plane assembly 6 of the non-focusing interference spectrometer with a computer 13, wherein imaging software is installed on the computer 13, and calculating an optical transfer function of the non-focusing interference spectrometer through a black and white fringe image formed by a fringe plate target 11 in the imaging software of the computer 13, wherein the maximum position of the optical transfer function of the non-focusing interference spectrometer is the optimal focal plane position;
the target 11 is then moved back and forth through the system focal length f of the collimator 101System design focal length f of focusing-free interference spectrometer2And a movement distance Deltax 'when the streak plate target 11 is moved from the initial position to the optimum focal plane position'1Three data, calculate the amount Δ x 'that the forward telescope assembly trim pad 102 needs to adjust'2。
In the above steps 3.5) and 3.6):
the formula for calculating the optical transfer function of the focusing-free interference spectrometer is as follows:
wherein MTF is optical transfer function DN of non-focusing interference spectrometerBright Light (LIGHT)For the white stripe gray value, DN, read in the imaging softwareDarknessFor black stripe gray value, DN, read in the imaging softwareDark levelWhen the non-focusing interference spectrometer is in a non-imaging state, the gray value of a detector in the focal plane assembly is the gray value of the detector;
Δx2and Δ x'2Calculated according to the following formula:
wherein the content of the first and second substances,Δx1、Δx′1distance traveled for target 11 of striped plate, f1Is the system focal length, f, of the collimator 102The focal length is designed for the system of the non-focusing interference spectrometer.
And 3.7, adjusting the relative position of the focal plane assembly 6 and the supporting box body 2:
as shown in fig. 8, after the above-mentioned adjustment step is completed, an integrating sphere 8 is placed at the front end of the front telescope assembly 1 of the interferometer, imaging software is used on the computer 13 to monitor the zero-order fringe image on the focal plane assembly 6, and the relative position between the focal plane assembly 6 and the support box 2 is adjusted, and when the zero-order fringe image on the focal plane assembly 6 monitored on the computer 13 is at the optical design position in the detector of the focal plane assembly 6, the relative position adjustment between the focal plane assembly 6 and the support box 2 is completed.
Fourthly, performing vacuum image surface presetting on the uniformly integrated and adjusted non-focusing interference spectrometer:
and performing vacuum image surface presetting on the non-focusing interference spectrometer after the ground adjustment is finished, wherein the vacuum image surface presetting is to simulate a space environment on the ground, presetting the relative position of each component of the non-focusing interference spectrometer in the space environment, and testing related data to judge the accuracy of the vacuum presetting.
Step 4.1, calculating the thickness of the front telescope component trimming pad 102, the thickness of the collimator component trimming pad 302, the thickness of the foucault mirror component trimming pad 502 and the thickness of the focal plane component trimming pad 602 (namely the thickness of the air pad) in the vacuum environment according to the thickness of the front telescope component trimming pad 102, the thickness of the collimator component trimming pad 302, the thickness of the interferometer component trimming pad 401, the thickness of the foucault mirror component trimming pad 502 and the thickness of the focal plane component trimming pad 602 (namely the thickness of the vacuum pad) in the ground air environment determined in the process of installing and adjusting the ground, and then re-processing the corresponding trimming pads according to the thickness of the vacuum pads to obtain the vacuum pads;
4.2, after replacing an air cushion in the non-focusing interference spectrometer with a vacuum cushion, performing a thermal vacuum test (the thermal vacuum test is to place the spectrometer in a vacuum tank and keep the temperature of the spectrometer constant at the actual on-orbit temperature through a temperature control system so as to simulate the on-orbit working state of the spectrometer, and perform related tests on the spectrometer in the state), and measuring the optical transfer function of the non-focusing interference spectrometer in a space vacuum environment;
4.3, if the tested optical transfer function is consistent with the tested data under the ground environment (namely consistent with the optical design value), indicating that the vacuum image surface is accurately preset, and performing subsequent assembly according to the existing state, namely entering the fifth step; if the tested optical transfer function is not consistent with the tested data in the ground environment (namely, is not consistent with the optical design value), the vacuum image surface presetting is proved to be inaccurate, the vacuum pad data calculated in the step 4.1 needs to be rechecked and recalculated, the thicknesses of the front telescopic assembly trimming pad 102, the collimator assembly trimming pad 302, the Fourier mirror assembly trimming pad 502 and the focal plane assembly trimming pad 602 are readjusted, the thermal vacuum test is performed again after the adjustment, and the process is repeated until the tested optical transfer function is consistent with the tested data in the ground environment (namely, consistent with the optical design value).
In the step 4.1, the method for calculating the thickness of each trimming pad assembly (i.e. the thickness of the vacuum pad) in the vacuum environment includes:
4.1.1) acquiring the spacing difference between different components in a space vacuum environment and a ground air environment through calculation and simulation analysis:
performing software (for example, zemax software) analysis on an optical system of the non-focusing interference spectrometer, setting the analysis environment as a space vacuum environment, continuously adjusting the intervals between the front telescope assembly 1, the collimator assembly 3, the fourier assembly 5 and the focal plane assembly 6, and finally enabling the optical indexes (optical transfer function and focal length) of the non-focusing interference spectrometer in the space vacuum environment to be consistent with the optical indexes (optical transfer function and focal length) in the ground air environment, wherein the difference value between the interval between the front telescope assembly 1 and the collimator assembly 3 and the interval between the front telescope assembly 1 and the collimator assembly 3 in the ground air environment is the interval difference value between the front telescope assembly 1 and the collimator assembly 3, and the difference value between the interval between the collimator assembly 3 and the fourier assembly 5 and the interval between the collimator assembly 3 and the fourier assembly 5 in the ground air environment is the collimator assembly 3 and the fourier assembly 5 The difference of the intervals between the assemblies 5, namely the difference of the interval between the fourier mirror assembly 5 and the focal plane assembly 6 and the interval between the fourier mirror assembly 5 and the focal plane assembly 6 in the ground air environment is the difference of the intervals between the fourier mirror assembly 5 and the focal plane assembly 6;
3.1.2) adding the corresponding interval difference obtained in the step 3.1.1) to the thickness of each trimming pad in the ground air environment, and obtaining the sum result, namely the thickness of the front mirror assembly trimming pad 102, the thickness of the collimating mirror assembly trimming pad 302, the thickness of the foucault mirror assembly trimming pad 502 and the thickness of the focal plane assembly trimming pad 602 in the vacuum environment.
Fifthly, curing assembly precision:
after the assembling and adjusting steps are finished, pin holes are drilled among the front telescope component 1, the collimator mirror component 3, the interferometer component 4, the Fourier mirror component 5, the focal plane component 6 and the support box body 2 respectively, and pins are installed at the pin holes so as to solidify and assemble the precision.
Sixthly, performance verification:
and carrying out corresponding mechanical tests on the assembled non-focusing interference spectrometer, wherein the mechanical tests comprise a static test, an acceleration test, a sinusoidal vibration test, a random vibration test, an impact test and the like, and the specific mechanical test input conditions are determined according to the overall requirements of the satellite.
The mechanical test is to simulate the mechanical vibration conditions borne by the non-focusing interference spectrometer in the processes of launching, lifting, track changing and the like, so as to verify the stability of the interference spectrometer, and if the data of all optical indexes (including focal length, optical transfer function, field of view and imaging position) of the spectrometer are consistent before and after the mechanical test, the performance of the non-focusing interference spectrometer is stable, and the assembly is qualified; if the optical index data before and after the mechanical test are inconsistent, the problem needs to be analyzed and positioned, after the position of the problem is positioned, the spectrometer is reassembled according to the current assembly and adjustment step and the subsequent assembly and adjustment step, and finally the stability of the performance of the non-focusing interference spectrometer is ensured.
Claims (9)
1. A method for assembling and adjusting a non-focusing interference spectrometer comprises a front telescope component (1), a support box body (2), a collimating mirror component (3), an interferometer component (4), a Fourier mirror component (5) and a focal plane component (6);
it is characterized in that the preparation method is characterized in that,
the method comprises the following steps:
1) designing and processing a front telescopic assembly trimming pad (102) between the front telescopic assembly (1) and the support box body (2), designing and processing a collimating mirror assembly trimming pad (302) between the collimating mirror assembly (3) and the support box body (2), designing and processing an interferometer assembly trimming pad (401) between the interferometer assembly (4) and the support box body (2), designing and processing a Fourier mirror assembly trimming pad (502) between the Fourier mirror assembly (5) and the support box body (2), and designing and processing a focal plane assembly trimming pad (602) between the focal plane assembly (6) and the support box body (2);
2) respectively and independently adjusting the front telescope assembly (1), the collimator lens assembly (3), the interferometer assembly (4), the Fourier lens assembly (5) and the focal plane assembly (6);
3) under the ground air environment, the front telescope component (1), the collimator mirror component (3), the interferometer component (4), the Fourier mirror component (5), the focal plane component (6) and the corresponding trimming pads which are separately assembled and adjusted are uniformly integrated and adjusted;
4) performing vacuum image surface presetting on the uniformly integrated and adjusted non-focusing interference spectrometer;
4.1) calculating the thickness of the front telescope component trimming pad (102), the thickness of the collimator mirror component trimming pad (302), the thickness of the Fourier mirror component trimming pad (502) and the thickness of the focal plane component trimming pad (602) in a vacuum environment according to the thickness of the front telescope component trimming pad (102), the thickness of the collimator mirror component trimming pad (302), the thickness of the interferometer component trimming pad (401), the thickness of the Fourier mirror component trimming pad (502) and the thickness of the focal plane component trimming pad (602) in the ground air environment determined in the process of installing and adjusting the ground, and processing a corresponding vacuum pad according to the calculated thicknesses;
4.2) after a trimming pad in the non-focusing interference spectrometer is replaced by a corresponding vacuum pad, performing a thermal vacuum test, and measuring an optical transfer function of the non-focusing interference spectrometer in a space vacuum environment;
4.3) if the tested optical transfer function is consistent with the optical design value, the vacuum image plane is accurately preset; if the tested optical transfer function is not consistent with the optical design value, the vacuum image surface presetting is proved to be inaccurate, the calculation data in the step 4.1) needs to be rechecked and recalculated, the thicknesses of the front telescope component trimming pad (102), the collimator mirror component trimming pad (302), the Fourier mirror component trimming pad (502) and the focal plane component trimming pad (602) are readjusted, the thermal vacuum test is carried out again after the adjustment, and the process is repeated until the tested optical transfer function is consistent with the tested data in the ground environment;
5) curing and assembling precision;
6) and (5) verifying the performance.
2. The method of tuning an interference spectrometer without focusing according to claim 1, wherein: the step 2) is specifically as follows:
2.1) the front telescope component (1) is independently assembled, so that the optical transfer function, the focal length and the rear intercept of the front telescope component meet the optical design requirements;
2.2) centering the front telescope component supporting lens barrel (101), and ensuring that the coaxiality of a mechanical central shaft of an assembly circumferential surface of the front telescope component supporting lens barrel (101) and an optical axis of an optical system of the front telescope component and the verticality of an assembly flange surface of the front telescope component supporting lens barrel (101) and the optical axis of the optical system of the front telescope component meet optical design requirements;
2.3) independently assembling the alignment straight mirror assembly (3) to ensure that the optical transfer function, the focal length and the transmittance of the alignment straight mirror assembly meet the optical design requirements;
2.4) aligning the collimating lens barrel (301) for centering processing, and ensuring that the coaxiality of the mechanical central shaft of the assembling circumferential surface (232) of the collimating lens component and the optical axis of the optical system of the collimating lens component (3) and the verticality of the assembling flange surface of the collimating lens barrel (301) and the optical axis of the optical system of the collimating lens component (3) meet the optical design requirements;
2.5) independently assembling the Fourier mirror assembly (5) to ensure that the optical transfer function, the focal length and the transmittance of the Fourier mirror assembly meet the optical design requirements;
2.6) centering the Fourier lens barrel (501), and ensuring that the coaxiality of the mechanical central axis of the assembling circumferential surface (252) of the Fourier lens assembly and the optical axis of the optical system of the Fourier lens assembly (5) and the verticality of the assembling flange surface of the Fourier lens barrel (501) and the optical axis of the optical system of the Fourier lens assembly (5) meet the optical design requirement;
2.7) independently assembling the interferometer component (4), and ensuring that the perpendicularity of an incidence optical axis (43) of the interferometer component and an emergent optical axis (44) of the interferometer component, the perpendicularity of the incidence optical axis (43) of the interferometer component and an incidence light surface (41) of the interferometer component, and the perpendicularity of the emergent optical axis (44) of the interferometer component and an emergent light surface (42) of the interferometer component meet the optical design requirement;
2.8) independently assembling the focal plane assembly (6) to ensure that the parallelism between a detector photosensitive surface of the focal plane assembly (6) and a flange surface of a focal plane assembly structure frame (601) meets the optical design requirement;
2.9) carrying out one-time processing on the supporting box body (2) to ensure that the coaxiality, the verticality and the parallelism of an assembly flange surface and an assembly circumferential surface which are used for assembling each component on the supporting box body (2) all meet the design requirements.
3. The method of tuning an interference spectrometer without focusing according to claim 1 or 2, wherein:
the step 3) is specifically as follows:
3.1) assembling the interferometer assembly (4) and the interferometer assembly trimming pad (401) in the supporting box body (2), adjusting the thickness of the interferometer assembly trimming pad (401), and adjusting the relative position of the interferometer assembly (4) and the supporting box body (2);
3.2) assembling the collimating mirror assembly (3) and the collimating mirror assembly trimming pad (302) in the supporting box body (2);
3.3) assembling the Fourier mirror assembly (5) and the Fourier mirror assembly trimming pad (502) in the supporting box body (2);
3.4) assembling the focal plane assembly (6) and the focal plane assembly trimming pad (602) in the supporting box body (2), and adjusting the inclination of the interferometer assembly trimming pad (401);
3.5) adjusting the thickness and the gradient of the focal plane assembly trimming pad (602);
3.6) mounting the front telescopic assembly (1) on the supporting box body (2), and determining the thickness of the front telescopic assembly trimming pad (102);
3.7) adjusting the relative position of the focal plane component (6) and the supporting box body (2).
4. The method of tuning an interference spectrometer without focusing according to claim 3, wherein:
the step 3.1) is specifically as follows:
firstly, assembling an interferometer component (4) and an interferometer component trimming pad (401) in a supporting box body (2), and adjusting the thickness of the interferometer component trimming pad (401) to ensure that the distance between an optical axis plane formed by an incidence optical axis (43) of the interferometer component and an emergence optical axis (44) of the interferometer component and an installation reference plane (201) of the interferometer component in the supporting box body is the same as the distance between a central axis plane formed by a mechanical central axis of a collimator component assembly circumferential surface (232) used for installing a collimator component (3) on the supporting box body (2) and a mechanical central axis of a Fourier component assembly circumferential surface (252) used for installing a Fourier component (5) on the supporting box body (2) and the installation reference plane (201) of the interferometer component in the supporting box body;
then, two theodolites (7) are respectively arranged in front of an incident light surface (41) of the interferometer component and in front of an emergent light surface (42) of the interferometer component, the two theodolites (7) are mutually self-aligned, the angles of the incident light surface (41) of the interferometer component and the emergent light surface (42) of the interferometer component are respectively monitored by the two theodolites (7), the verticality of an incident light axis (43) of the interferometer component and a collimator component assembling flange surface (231) which is arranged on the supporting box body (2) and used for installing the collimator component (3) meets the optical design requirement by adjusting the relative position of the interferometer component (4) and the supporting box body (2), and the coaxiality of the incident light axis (43) of the interferometer component and a mechanical central axis of a collimator component assembling circumferential surface (232) which is arranged on the supporting box body (2) and used for installing the collimator component (3) meets the optical design, the perpendicularity between the emergent optical axis (44) of the interferometer component and a Fourier mirror assembly flange surface (251) used for mounting the Fourier mirror assembly (5) on the supporting box body (2) meets the optical design requirement, and the coaxiality between the emergent optical axis (44) of the interferometer component and a mechanical central axis of a Fourier mirror assembly circumferential surface (252) used for mounting the Fourier mirror assembly (5) on the supporting box body (2) meets the optical design requirement.
5. The method of tuning an interference spectrometer without focusing according to claim 3, wherein:
the step 3.4) is specifically as follows:
firstly, assembling a focal plane assembly (6) on a supporting box body (2), and installing a focal plane assembly trimming pad (602) between the focal plane assembly (6) and the supporting box body (2);
then, place integrating sphere (8) at collimating mirror subassembly (3) front end, hang plumb line (9) in the light path between integrating sphere (8) and collimating mirror subassembly (3), monitor the contained angle that plumb line (9) formed image and become interference fringe on focal plane subassembly (6), adjust the gradient of interferometer subassembly trimming pad (401), when plumb line (9) formed image and become interference fringe contained angle when being 90 on focal plane subassembly (6), accomplish the adjustment.
6. The method of tuning an interference spectrometer without focusing according to claim 3, wherein:
the step 3.5) is specifically as follows:
firstly, detaching a collimating mirror assembly (3) and a collimating mirror assembly trimming pad (302) from a supporting box body (2), carrying out a focus scanning test on a spectrometer in the state, and determining the optimal position of a focal plane assembly (6) so as to determine the thickness of the focal plane assembly trimming pad (602);
then, monitoring the consistency of the gray values of the boundaries at the two ends of the image formed by the streak plate target (11) on the focal plane assembly (6), adjusting the inclination of the focal plane assembly (6), and finishing the adjustment when the gray values of the boundaries at the two ends of the image formed by the streak plate target (11) on the focal plane assembly (6) are consistent, so as to determine the inclination of the trimming pad (602) of the focal plane assembly;
finally, machining the focal plane assembly trimming pad (602) according to the determined thickness and gradient of the focal plane assembly trimming pad (602), installing the machined focal plane assembly (6) and the focal plane assembly trimming pad (602) on the supporting box body (2), testing the consistency of the optical transfer function of the spectrograph and the gray value of the fringe plate target (11) at the boundaries of two ends imaged on the focal plane assembly (6) in the state, and completing the adjustment of the focal plane assembly (6) if the test data meets the optical design requirement; if the test data do not meet the optical design requirement, the thickness and the gradient of the focal plane assembly trimming pad (602) are readjusted according to the steps until the consistency of the optical transfer function of the spectrometer and the gray values of the fringe plate target (11) at the boundaries of two ends of the image formed on the focal plane assembly (6) meets the optical design requirement.
7. The method of tuning an interference spectrometer without focusing according to claim 6, wherein:
in step 3.5), the thickness of the focal plane assembly trimming pad (602) to be adjusted is determined according to the following method:
firstly, under the condition that a non-focusing interference spectrometer is not provided with a front telescope component (1), a front telescope component trimming pad (102) and a collimator component (3), a collimator (10) is arranged at the front end of an incident light surface (41) of the interferometer component, and a target (11) of a streak plate is arranged at a target position at the end part of the collimator (10); connecting a focal plane assembly (6) with a computer (13) provided with imaging software, and calculating an optical transfer function of the non-focusing interference spectrometer through a black-and-white fringe image formed by a target (11) of a fringe plate in the imaging software of the computer (13), wherein the maximum position of the optical transfer function of the non-focusing interference spectrometer is the optimal focal plane position;
then, the target (11) is moved back and forth through the focal length f of the collimator (10)1Design focal length f of focusing-free interference spectrometer2And a movement distance Deltax when the target (11) moves from the initial position to the optimal focal plane position1Calculating the amount Deltax that the focal plane assembly trimming pad (602) needs to be adjusted2。
8. The method of tuning an interference spectrometer without focusing according to claim 3, wherein:
the step 3.6) is specifically as follows:
firstly, mounting a front telescopic assembly (1) on a supporting box body (2), determining the optimal position of the front telescopic assembly (1) through a focus sweeping test, thereby preliminarily determining the thickness of a front telescopic assembly trimming pad (102), and processing the front telescopic assembly trimming pad (102) according to the thickness;
then, the front telescopic assembly (1) and the processed front telescopic assembly trimming pad (102) are arranged on the supporting box body (2), the optical transfer function of the spectrometer in the state is tested, and if the tested optical transfer function meets the optical design requirement, the assembly and the adjustment of the front telescopic assembly (1) are completed; if the tested optical transfer function does not meet the optical design requirement, the thickness of the front telescope assembly trimming pad (102) is readjusted according to the steps until the optical transfer function of the spectrometer meets the optical design requirement in the state.
9. The method of tuning an afocal interferometric spectrometer of claim 8, wherein:
in step 3.6), the thickness of the front telescopic assembly trimming pad (102) to be adjusted is determined according to the following method:
firstly, under the state that a non-focusing interference spectrometer is provided with a front telescope component (1), a front telescope component trimming pad (102) and a collimating mirror component (3), a collimator (10) is arranged at the front end of the front telescope component (1), a streak plate target (11) is arranged at the target position at the end part of the collimator (10), a focal plane component (6) is connected with a computer (13) provided with imaging software, the optical transfer function of the non-focusing interference spectrometer is calculated through a black and white streak image formed by the streak plate target (11) in the imaging software of the computer (13), and the maximum position of the optical transfer function of the non-focusing interference spectrometer is the optimal focal plane position;
then, the target (11) is moved back and forth through the system focal length f of the collimator (10)1System design focal length f of focusing-free interference spectrometer2And a movement distance Deltax 'when the target (11) moves from the initial position to the optimal focal plane position'1Calculating the amount delta x 'of the front telescope trim pad (102) to be adjusted'2。
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