Multispectral light splitting assembly and assembling and adjusting method

Abstract

The invention provides a multispectral light splitting assembly and an adjustment method, and relates to the technical field of aviation optics, and the multispectral light splitting assembly comprises an optical axis steering assembly, a main frame, a mirror frame, a turn-back mirror body, a first flexible supporting ring, a flexible pressing ring, an adapter seat, a second flexible supporting ring, a light splitting mirror body and a flexible installation seat. Spectral light splitting is carried out in a mode of combining a fold-back mirror body and a spectroscope body, a multispectral light splitting function is achieved, the rigidity requirement of a structural supporting lens is guaranteed through arrangement of a first flexible supporting ring and a second flexible supporting ring, the first flexible supporting ring and the second flexible supporting ring are both in a symmetrical closed wave shape, and the light splitting efficiency is improved. A flexible bending surface is formed, the flexible characteristic is achieved, mismatching of material expansion coefficients caused by temperature changes is weakened, deformation caused by the fact that deformation stress is applied to the lens is avoided, and the technical problem that an existing reflector supporting structure shrinks and deforms in the ultralow-temperature environment, and consequently the surface type of a reflector body is damaged and deformed is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aviation optics, in particular to a multispectral light splitting assembly and an assembling and adjusting method. BACKGROUND

[0002] With the development of science and technology, the detection and identification capabilities of airborne loads are also continuously improving. Since the optical characteristics of targets vary at different time periods in all-weather, the airborne loads need not only to adapt to all-weather task execution, but also to obtain target information in multiple wavebands to form all-weather, multispectral and high-resolution detection capabilities. The plane mirrors and light splitting mirrors in a multispectral optical system may be used alone or in combination, and play a very important role in the optical system. The plane mirror only serves to fold the light path, and the surface of the light splitting mirror is coated with different waveband films to serve as a pass-through and reflection for different spectra. Although the mirror and the light splitting mirror have no focal length and do not form images by themselves, the surface shape of the mirror plays a crucial role in the imaging effect. Therefore, the support of the mirror in an optical assembly requires a very high level of support, especially when subjected to impact, vibration, pressure and temperature changes, the original surface shape precision must be maintained. In addition, in a harsh environment such as an ultra-low temperature environment, the surface shape can be restored after returning to normal temperature after the surface shape changes, and no permanent plastic deformation occurs. However, the structural parts of the existing mirror support structure often shrink and deform excessively in an ultra-low temperature environment, which causes damage and deformation of the mirror surface. SUMMARY

[0003] Therefore, the present application aims to overcome the defects in the prior art and provide a multispectral light splitting assembly and an assembling and adjusting method.

[0004] A multispectral light splitting assembly, comprising a folding unit, a light splitting unit and an optical axis turning assembly, the multispectral light splitting assembly further comprising a main frame, the folding unit, the light splitting unit and the optical axis turning assembly are all arranged on the main frame, a light beam incident on the optical axis turning assembly is emitted to the light splitting unit, the light splitting unit reflects the light beam to the folding unit, the folding unit reflects the light beam to a spectral imaging detector, the folding unit comprises a mirror frame, a folding mirror body, a first flexible support ring and a flexible pressing ring, the first flexible support ring is a symmetrical structure, the cross section of the first flexible support ring is a closed wave shape, the mirror frame is fixedly installed on the main frame, the first flexible support ring is arranged in the mirror frame, the folding mirror body is installed in the first flexible support ring, and the flexible pressing ring is installed on the first flexible support ring, the light splitting unit comprises an adapter seat, a second flexible support ring, a light splitting mirror body and a flexible mounting seat, the first flexible support ring and the second flexible support ring are of the same structure, the adapter seat is fixedly installed on the main frame, the flexible mounting seat is fixedly connected with the adapter seat, the second flexible support ring is arranged in the flexible mounting seat, and the light splitting mirror body is installed in the second flexible support ring.

[0005] Further, a plurality of unloading grooves are uniformly arranged on the mirror frame, and a first glue injection through hole is arranged on the sidewall of the mirror frame.

[0006] Further, a plurality of limiting pad tables are uniformly arranged on the mirror frame, the turning mirror body is a middle wave turning mirror, a mirror body clamping groove is arranged on the middle wave turning mirror, and the mirror body clamping groove is in contact with the limiting pad table.

[0007] Further, a plurality of inner glue injection grooves are uniformly arranged on the inner wall of the first flexible support ring, a plurality of outer glue injection grooves are uniformly arranged on the outer wall of the first flexible support ring, a second glue injection through hole is further arranged on the first flexible support ring, the second glue injection through hole is in communication with the inner glue injection grooves, and the outer glue injection grooves correspond to the first glue injection through hole in position.

[0008] Further, the multi-spectrum light splitting assembly further comprises a clamping groove and an elastic spring piece, the clamping groove is arranged in pairs on the upper surface of the flexible pressing ring, and the elastic spring piece is uniformly arranged on the lower surface of the flexible pressing ring and in contact with the first flexible support ring.

[0009] Further, the multi-spectrum light splitting assembly further comprises a gasket, a plurality of inward installation interfaces are arranged on the main frame, the gasket is connected with the inward installation interfaces, and the mirror frame is connected with the gasket.

[0010] Further, the multi-spectrum light splitting assembly further comprises an outward installation interface and an adjustment reference interface, and the outward installation interface and the adjustment reference interface are both arranged on the main frame.

[0011] Further, the multi-spectrum light splitting assembly further comprises a gasket, and the gasket is arranged between the flexible mounting seat and the adapter seat.

[0012] Further, the cross section of the elastic spring piece is Z-shaped.

[0013] The application further comprises an adjustment method of the multi-spectrum light splitting assembly, which is realized based on any one of the above multi-spectrum light splitting assemblies, and the adjustment method comprises the following steps: Step S1, installing the turning mirror body in the first flexible support ring and injecting glue for bonding and fixing; Step S2, installing the first flexible support ring into the mirror frame and injecting glue for bonding and fixing; Step S3, installing the flexible pressing ring on the first flexible support ring and installing the mirror frame on the main frame; Step S4, installing the light splitting mirror body in the second flexible support ring and injecting glue for bonding and fixing; Step S5, installing the second flexible support ring into the flexible mounting seat and injecting glue for bonding and fixing; Step S6, connecting the flexible mounting seat with the adapter seat, and connecting the adapter seat with the main frame.

[0014] The technical scheme has the following advantages: In the technical scheme, the spectrum spectrometer adopts a form of combination of a return mirror body and a spectrometer body for spectrometry, the return mirror body is used for emitting light after folding the angle of the light, and the spectrometer body is used for transmitting and reflecting different spectrums to realize the multi-spectrum spectrometry function, the first flexible support ring is used for mounting the return mirror body, and the second flexible support ring is used for mounting the spectrometer body, so that the rigidity requirement of the structure support lens is ensured, and meanwhile, since the first flexible support ring and the second flexible support ring are both symmetrical closed wave shapes, a flexible curved surface is formed, the flexible characteristic is provided, and the mismatch of the material expansion coefficient caused by the temperature change is further weakened, and the deformation stress applied on the lens to cause the deformation is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical scheme in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 It is a sectional view of the overall structure of the present application. Figure 2 It is an exploded view of the structure of the short-wave infrared return assembly in the present application. Figure 3 It is an exploded view of the structure of the short-wave infrared return assembly in the present application. Figure 4 It is a structure schematic diagram of the internal mounting interface of the present application. Figure 5 It is a structure schematic diagram of the external mounting interface of the present application. Figure 6 It is a structure schematic diagram of the installation and adjustment reference interface of the present application. Figure 7 It is a structure schematic diagram of the clamping groove of the present application. Figure 8 It is a structure schematic diagram of the elastic spring sheet of the present application. Figure 9 It is a structure schematic diagram of the first flexible support ring of the present application. Figure 10 It is a structure schematic diagram of the medium-wave return mirror in the present application. Figure 11 It is a structure schematic diagram of the lens frame of the present application. Figure 12 It is a sectional view of the structure of the medium-wave infrared return assembly in the present application. Figure 13 Structure sectional view of short-wave infrared spectrometer assembly of the present application; Figure 14 Structure sectional view of first flexible support ring of the present application.

[0017] Explanation of reference signs: 1-mid-wave infrared folding assembly; 2-short-wave infrared spectrometer assembly; 3-near infrared folding assembly; 4-near infrared spectrometer assembly; 5-main frame; 6-optical axis turning assembly; 7-short-wave folding assembly; 8-inward mounting interface; 9-outward mounting interface; 10-adjustment reference interface; 11-gasket; 12-mirror frame; 1201-unloading groove; 1202-first glue injection through hole; 1203-limiting pad; 13-mid-wave folding mirror; 1301-mirror body clamping groove; 14-first flexible support ring; 1401-second glue injection through hole; 1402-inward glue injection groove; 1403-outward glue injection groove; 1404-contact section; 1405-non-contact section; 15-flexible pressing ring; 1501-clamping groove; 1502-elastic spring piece; 16-adapting seat; 17-gasket; 18-second flexible support ring; 19-short-wave spectrometer mirror; 20-flexible mounting seat; 2001-third glue injection through hole. DETAILED DESCRIPTION

[0018] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] Furthermore, the technical features involved in the different embodiments of the application described below can be combined with each other as long as there is no conflict.

[0022] As Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 , Figure 9 , Figure 11 , Figure 12 , Figure 13 and Figure 14The multispectral light splitting assembly shown comprises a turning unit, a light splitting unit and a light axis turning assembly 6, and further comprises a main frame 5, the turning unit, the light splitting unit and the light axis turning assembly 6 are all arranged on the main frame 5, the light beam incident on the light axis turning assembly 6 is emitted to the light splitting unit, the light splitting unit reflects the light beam to the turning unit, the turning unit reflects the light beam to the spectral imaging detector, the turning unit comprises a mirror frame 12, a turning mirror body, a first flexible support ring 14 and a flexible pressing ring 15, the first flexible support ring 14 is a symmetrical structure, the cross section of the first flexible support ring 14 is a closed wave shape, and the first flexible support ring 14 is annular, so the closed wave shape is formed according to the circular ring shape, therefore, the first flexible support ring 14 has a contact section 1404 and a non-contact section 1405, wherein the contact section 1404 and the non-contact section 1405 are arranged alternately, so that the cross section of the first flexible support ring 14 is a closed wave shape, at the same time, the contact section 1404 is in contact with the turning mirror body, and the non-contact section 1405 is not in contact with the turning mirror body, so the first flexible support ring 14 forms a flexible bending surface and has a flexible characteristic, the mirror frame 12 is fixedly installed on the main frame 5 by screws, the first flexible support ring 14 is arranged in the mirror frame 12, the turning mirror body is installed in the first flexible support ring 14, and the flexible pressing ring 15 is threadedly installed on the first flexible support ring 14, the light splitting unit comprises an adapter seat 16, a second flexible support ring 18, a light splitting mirror body and a flexible mounting seat 20, the first flexible support ring 14 and the second flexible support ring 18 are the same in structure, the adapter seat 16 is fixedly installed on the main frame 5 by screws, the flexible mounting seat 20 is fixedly connected with the adapter seat 16, the second flexible support ring 18 is arranged in the flexible mounting seat 20, the light splitting mirror body is installed in the second flexible support ring 18, the first flexible support ring 14 and the second flexible support ring 18 are both processed in the form of electro-spark low-speed wire cutting and have high dimensional accuracy, not only serving as a positioning structure of the lens, but also keeping good reference transmission, so that the lens has flexibility in the radial direction and rigidity in other directions, when the size of the assembly changes with low temperature, the first flexible support ring 14 and the second flexible support ring 18 are flexibly bent due to the mismatch of the thermal expansion coefficients between the parts, so that the force applied on the lens is unloaded, thereby avoiding the change of the lens surface shape, and the first flexible support ring 14 and the second flexible support ring 18 are symmetrical structures, and the position will not change when shrinking at low temperature, wherein the turning unit specifically comprises a middle-wave infrared turning assembly 1, a near-infrared turning assembly 3 and a short-wave turning assembly 7, the light splitting unit specifically comprises a short-wave infrared light splitting assembly 2 and a near-infrared light splitting assembly 4, the middle-wave infrared turning assembly 1, the near-infrared turning assembly 3 and the short-wave turning assembly 7 are the same in structure composition as the turning unit, and the difference only lies in that the lenses in the assemblies are different, the turning mirror body in the middle-wave infrared turning assembly 1 is a middle-wave turning mirror 13, the turning mirror body in the near-infrared turning assembly 3 is a near-infrared turning mirror, and the turning mirror body in the short-wave turning assembly 7 is a short-wave turning mirror.The short-wave infrared beam splitter 2 and the near-infrared beam splitter 4 have the same structural composition as the beam splitting unit, the only difference being the lenses in each component. The beam splitter in the short-wave infrared beam splitter 2 is a short-wave beam splitter 19, while the beam splitter in the near-infrared beam splitter 4 is a near-infrared beam splitter. The structure of the optical axis steering component 6 is also the same as the folding unit, and the lens on the optical axis steering component 6 is a beam splitter. For the specific optical path routing, please refer to the attached instruction manual. Figure 1 As shown by the arrows, sunlight is split after entering the optical axis steering component 6. First, the beam of light passing through the optical axis steering component 6 enters the near-infrared beam splitter 4. Part of the beam is reflected by the near-infrared beam splitter 4 to the near-infrared refracting component 3, and then reflected by the near-infrared refracting component 3 to the corresponding spectral imaging detector. The other part of the beam is transmitted to the short-wave infrared beam splitter 2. The beam transmitted to the short-wave infrared beam splitter 2 is then split into two parts. One part of the beam continues to be transmitted to the mid-wave infrared refracting component 1, and is reflected by the mid-wave infrared refracting component 1 to the corresponding spectral imaging detector. The other part of the beam is reflected to the short-wave infrared refracting component 7, and then reflected by the short-wave infrared refracting component 7 to the corresponding spectral imaging detector. This achieves the splitting of a beam of sunlight into near-infrared, short-wave infrared, and mid-wave infrared spectra, while simultaneously pointing it out with a precise angle.

[0023] The aforementioned multispectral beam splitting assembly uses a combination of a folding mirror and a beam splitter for beam splitting. The folding mirror folds the spectrum at an angle before emitting it, while the beam splitter transmits and reflects different spectra, thus achieving multispectral beam splitting. The folding mirror is mounted on a first flexible support ring 14, and the beam splitter is mounted on a second flexible support ring 18, ensuring the rigidity requirements of the structural support lens. At the same time, since both the first flexible support ring 14 and the second flexible support ring 18 are symmetrical closed wave shapes, they form flexible bending surfaces with flexible characteristics, further reducing the mismatch of material expansion coefficients caused by temperature changes and avoiding deformation stress on the lens.

[0024] like Figure 2 , Figure 9 , Figure 11 and Figure 12 As shown, in this embodiment, a plurality of unloading grooves 1201 are evenly provided on the frame 12, and a first glue injection through hole 1202 is provided on the side wall of the frame 12. The unloading grooves 1201 are evenly distributed on the upper surface of the frame 12 at 120-degree intervals. The unloading grooves 1201 are used to unload the stress generated by the deformation of the frame 12 due to temperature changes, thereby reducing the compression on the first flexible support ring 14. The even distribution can also evenly disperse this stress, achieving the best unloading effect. Glue is injected through the first glue injection through hole 1202 to bond and fix the frame 12 and the first flexible support ring 14 into an integral structure.

[0025] As Figure 2 , Figure 10 , Figure 11 and Figure 12 shown, in this embodiment, the mirror frame 12 is uniformly provided with a plurality of limiting pads 1203, the return mirror body is a middle wave return mirror 13, the middle wave return mirror 13 is provided with a mirror body clamping groove 1301, the mirror body clamping groove 1301 is in contact with the limiting pad 1203; the limiting pad 1203 is used for limiting support and mounting the lens, the limiting pad 1203 is integrally processed, the limiting pad 1203 is uniformly arranged at the bottom of the mirror frame 12 at intervals of 120 degrees, not only ensures that three points determine a plane, is convenient for installation, at the same time, after finishing, the three-point convexity flatness can reach 3 microns required by the optical machine structure, so as to reduce the difficulty of installation and adjustment, through the mirror body clamping groove 1301, the limiting pad 1203 is adaptively installed, also satisfies the installation requirement and improves the installation precision.

[0026] As Figure 2 , Figure 9 , Figure 11 , Figure 12 and Figure 14As shown, in the embodiment, the inner wall of the first flexible support ring 14 is uniformly provided with a plurality of inner glue injection grooves 1402, the outer wall of the first flexible support ring 14 is uniformly provided with a plurality of outer glue injection grooves 1403, and the first flexible support ring 14 is further provided with a second glue injection through hole 1401, the second glue injection through hole 1401 communicates with the inner glue injection grooves 1402, and the outer glue injection grooves 1403 correspond to the first glue injection through hole 1202 in position; the inner glue injection grooves 1402, the outer glue injection grooves 1403 and the second glue injection through hole 1401 are provided in six places and are uniformly distributed along the circumference of the first flexible support ring 14, so as to ensure uniform glue bonding, and even under temperature change, deformation can also be uniformly stressed, as described above, the first flexible support ring 14 has a contact section 1404 and a non-contact section 1405, and the second glue injection through hole 1401 and the inner glue injection grooves 1402 are provided on the contact section 1404, and the outer glue injection grooves 1403 are provided on the non-contact section 1405, because the functions are different, the second glue injection through hole 1401 communicates with the inner glue injection grooves 1402, 2216 epoxy resin can be injected into the inner glue injection grooves 1402 through the second glue injection through hole 1401, so that the inner glue injection grooves 1402 contain glue, and then the contact section 1404 is bonded with the return mirror body, so that the return mirror body and the first flexible support ring 14 are bonded into an integral structure, and the outer glue injection grooves 1403 correspond to the first glue injection through hole 1202 in position, 2216 epoxy resin is also injected through the first glue injection through hole 1202, and the outer glue injection grooves 1403 contain glue, so that the frame 12 is bonded with the non-contact section 1405, and then the frame 12 and the first flexible support ring 14 are bonded to form an integral body, the inner glue injection grooves 1402 and the outer glue injection grooves 1403 are processed by electric spark, which can accurately control the groove size to ensure the uniformity of the bonding glue layer thickness, so that the deformation amount of the lens remains consistent when the lens shrinks at low temperature.

[0027] As Figure 2 , Figure 7 , Figure 8 , Figure 9 , Figure 11 and Figure 12As shown, in the embodiment, the multispectral light splitting assembly further comprises a clamping groove 1501 and an elastic spring piece 1502. The clamping groove 1501 is arranged in pairs on the upper surface of the flexible pressing ring 15, and the elastic spring piece 1502 is uniformly arranged on the lower surface of the flexible pressing ring 15 and in contact with the first flexible support ring 14. Since the flexible pressing ring 15 is connected with the mirror frame 12 through threads, the arrangement of the clamping groove 1501 provides a clamping position for tightening the flexible pressing ring 15, which facilitates tightening and helps to unload the stress on the flexible pressing ring 15 caused by temperature changes, thereby avoiding deformation. The elastic spring piece 1502 is arranged in pairs on the lower surface of the flexible pressing ring 15, and the interval between each pair is 120 degrees. By arranging the elastic spring piece 1502, the flexible pressing ring 15 can be tightened while pressing the first flexible support ring 14 and the lens. However, the elastic spring piece 1502 does not directly contact the lens but contacts the first flexible support ring 14 to achieve elastic fixation. This is because the cross-section of the elastic spring piece 1502 is Z-shaped, and the elastic spring piece 1502 has a certain deformation amount. When the first flexible support ring 14 changes due to temperature changes, the elastic spring piece 1502 can change elastically and then dynamically compensate for displacement, thereby always maintaining the state of pressing the first flexible support ring 14.

[0028] As shown in Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 11 and Figure 12 , in the embodiment, the multispectral light splitting assembly further comprises a gasket 11, a plurality of inward mounting interfaces 8 are formed on the main frame 5, the gasket 11 is connected with the inward mounting interface 8, and the mirror frame 12 is connected with the gasket 11. The mirror frame 12, the gasket 11 and the inward mounting interface 8 are fastened and connected through screws. Each gasket 11 corresponding to the inward mounting interface 8 is arranged at intervals of 120 degrees. This is not only because three points determine a plane, but also facilitates grinding and improves the accuracy of later assembly and adjustment. Therefore, three mounting positions corresponding to the inward mounting interface 8 are arranged on the circumference of the mirror frame 12 and the gasket 11. A plurality of unloading grooves 1201 uniformly formed on the mirror frame 12 correspond to the three mounting positions on the mirror frame 12, which can directly unload the stress of the connection position and further reduce the impact on the lens. The multispectral light splitting assembly further comprises an outward mounting interface 9 and an assembly and adjustment reference interface 10. The outward mounting interface 9 and the assembly and adjustment reference interface 10 are arranged on the main frame 5. The outward mounting interface 9 is convenient for mounting the entire multispectral light splitting assembly to an external machine through the main frame 5 in the later stage. The assembly and adjustment reference interface 10 is convenient for the later assembly and adjustment process. The inward mounting interface 8, the outward mounting interface 9 and the assembly and adjustment reference interface 10 are all high-precision mechanical interfaces processed by a precision machine tool, which meet the connection of the inward and outward interfaces and also meet the later optical assembly and adjustment.

[0029] As shown in Figure 1 , Figure 3 and Figure 13 , in the embodiment, the multispectral light splitting assembly further comprises a gasket 17 arranged between the flexible mounting seat 20 and the adapter seat 16; the gasket 17 mainly plays an auxiliary connecting role and buffers the impact between the flexible mounting seat 20 and the adapter seat 16; the adapter seat 16, the gasket 17 and the flexible mounting seat 20 are fixedly connected to the main frame 5 through screws; and a plurality of third glue injection through holes 2001 are uniformly arranged on the flexible mounting seat 20, and the second flexible support ring 18 and the flexible mounting seat 20 are integrally adhered through the third glue injection through holes 2001.

[0030] As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 and Figure 14 , the present application further comprises a method for assembling and adjusting the multispectral light splitting assembly, which is realized based on any one of the above-mentioned multispectral light splitting assemblies, and the assembling and adjusting method comprises the following steps: Step S1, installing the return mirror body in the first flexible support ring 14 and injecting glue for adhesive fixing; Step S2, installing the first flexible support ring 14 into the mirror frame 12 and injecting glue for adhesive fixing; Step S3, installing the flexible pressing ring 15 on the first flexible support ring 14 and installing the mirror frame 12 on the main frame 5; Step S4, installing the light splitting mirror body in the second flexible support ring 18 and injecting glue for adhesive fixing; Step S5, installing the second flexible support ring 18 into the flexible mounting seat 20 and injecting glue for adhesive fixing; Step S6, connecting the flexible mounting seat 20 and the adapter seat 16, and connecting the adapter seat 16 and the main frame 5; Specifically, taking the middle wave infrared return assembly 1 as an example, step S1, the middle wave return mirror 13 is installed into the first flexible support ring 14, the contact surfaces of the middle wave return mirror 13 and the first flexible support ring 14 are designed with a given tolerance, and after installation, the position can be located, and the glue in the inner glue groove 1402 is injected through the second glue injection hole 1401, so that the middle wave return mirror 13 and the first flexible support ring 14 are bonded into one; Step S2, the first flexible support ring 14 is installed into the mirror frame 12, that is, the whole after the middle wave return mirror 13 and the first flexible support ring 14 are bonded in step S1 are installed into the mirror frame 12, the first flexible support ring 14 is rotated, so that the outer glue groove 1403 is aligned with the first glue injection hole 1202, the glue is injected into the outer glue groove 1403 through the first glue injection hole 1202, so that the first flexible support ring 14 and the mirror frame 12 are bonded and fixed into one; Step S3, the flexible pressing ring 15 is installed on the first flexible support ring 14, which is tightened and installed through the clamping groove 1501, the elastic spring piece 1502 is pressed against the first flexible support ring 14, and the mirror frame 12 and the gasket 11 are connected to the inner installation interface 8 through the screw, that is, installed on the main frame 5; The near-infrared return assembly 3, the short-wave return assembly 7 and the optical axis turning assembly 6 are all installed on the main frame 5 by repeating the above steps S1 to S3; Taking the short wave infrared spectrometer assembly 2 as an example, step S4, the short wave spectrometer 19 is installed into the second flexible support ring 18, since the structure of the second flexible support ring 18 is the same as that of the first flexible support ring 14, the bonding process of the second flexible support ring 18 and the short wave spectrometer 19 is the same as the operation process of step S1, so it is not described here; Step S5, the second flexible support ring 18 is installed into the flexible mounting seat 20, that is, the integral structure after the second flexible support ring 18 and the short wave spectrometer 19 are bonded in step S4 is installed into the flexible mounting seat 20, the second flexible support ring 18 is rotated, so that the outer glue groove of the second flexible support ring 18 is aligned with the third glue injection hole 2001 on the flexible mounting seat 20, and the second flexible support ring 18 and the flexible mounting seat 20 are bonded into an integral structure by injecting glue through the third glue injection hole 2001; Step S6, the flexible mounting seat 20, the adapter 16 and the gasket 17 are connected and fixed to the main frame 5 by screws; The near-infrared spectrometer assembly 4 is also installed on the main frame 5 by repeating steps S4 to S6.

[0031] The installation by the above method constitutes a highly integrated compact multispectral light splitting assembly, which splits a beam of sunlight into near infrared, short wave infrared and mid wave infrared spectrums and directs them out with precise angles. Meanwhile, the multispectral light splitting assembly has high structural stability and mode as a whole. The main frame 5 is used as a unified installation reference, so that the design reference, processing reference and adjustment reference are unified. In the reference link transmission process, the reference transmission error is reduced, the pointing accuracy of the optical-mechanical-optical axis is ensured, and the main frame 5 is used as the load-bearing structure of the whole assembly, which adopts a frame structure to ensure the stability of the structure.

[0032] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A multispectral spectrophotometer, comprising: The multispectral beam splitting assembly (6) includes a folding unit, a beam splitting unit, and an optical axis steering assembly (6). The folding unit, beam splitting unit, and optical axis steering assembly (6) are all mounted on the main frame (5). A beam incident on the optical axis steering assembly (6) exits to the beam splitting unit, which reflects the beam back to the folding unit. The folding unit then reflects the beam back into the spectral imaging detector. The folding unit includes a mirror frame (12), a folding mirror body, a first flexible support ring (14), and a flexible retaining ring (15). The first flexible support ring (14) has a symmetrical structure and a closed wavy cross-section. The mirror frame (12) is fixedly mounted on the main frame. (5) On the first flexible support ring (14), the first flexible support ring (14) is set inside the mirror frame (12), the folding mirror body is installed in the first flexible support ring (14), the flexible pressure ring (15) is installed on the first flexible support ring (14), the beam splitting unit includes the adapter (16), the second flexible support ring (18), the beam splitting mirror body and the flexible mounting base (20). The first flexible support ring (14) and the second flexible support ring (18) have the same structure. The adapter (16) is fixedly installed on the main frame (5), and the flexible mounting base (20) is fixedly connected to the adapter (16). The second flexible support ring (18) is set inside the flexible mounting base (20), and the beam splitting mirror body is installed in the second flexible support ring (18).

2. The multispectral spectrometer according to claim 1, characterized in that, The frame (12) is provided with a plurality of unloading grooves (1201) evenly distributed, and the side wall of the frame (12) is provided with a first glue injection through hole (1202).

3. The multispectral spectrometer according to claim 1, characterized in that, The frame (12) is provided with multiple limiting pads (1203) evenly distributed. The reflex mirror is a medium-wave reflex mirror (13). The medium-wave reflex mirror (13) is provided with a mirror body slot (1301). The mirror body slot (1301) is in contact with the limiting pads (1203).

4. A multispectral spectrophotometer according to claim 2, characterized in that, The first flexible support ring (14) has a plurality of inner glue injection grooves (1402) evenly opened on its inner wall and a plurality of outer glue injection grooves (1403) evenly opened on its outer wall. The first flexible support ring (14) is also provided with a second glue injection through hole (1401), which is connected to the inner glue injection grooves (1402) and the outer glue injection grooves (1403) are positioned corresponding to the first glue injection through hole (1202).

5. A multispectral spectrophotometer according to claim 1, characterized in that, The multispectral spectrometer also includes a slot (1501) and an elastic spring (1502). The slots (1501) are arranged in pairs on the upper surface of the flexible pressure ring (15), and the elastic springs (1502) are evenly arranged on the lower surface of the flexible pressure ring (15). The elastic springs (1502) are in contact with the first flexible support ring (14).

6. A multispectral spectrophotometer according to claim 1, characterized in that, The multispectral spectrometer also includes a gasket (11), and the main frame (5) has multiple internal mounting interfaces (8). The gasket (11) is connected to the internal mounting interfaces (8), and the mirror frame (12) is connected to the gasket (11).

7. A multispectral spectrophotometer according to claim 1, characterized in that, The multispectral spectrometer also includes an external mounting interface (9) and an assembly and adjustment reference interface (10), both of which are located on the main frame (5).

8. A multispectral spectrophotometer according to claim 1, characterized in that, The multispectral spectrometer also includes a gasket (17), which is disposed between the flexible mounting base (20) and the adapter (16).

9. A multispectral spectrophotometer according to claim 5, characterized in that, The cross-section of the elastic spring (1502) is Z-shaped.

10. A method for assembling and adjusting a multispectral spectrometer, the method being implemented based on a multispectral spectrometer according to any one of claims 1 to 9, characterized in that, The assembly and adjustment method includes the following steps: Step S1: Install the folding mirror body in the first flexible support ring (14) and inject glue for bonding and fixing; Step S2: Install the first flexible support ring (14) into the frame (12) and inject glue to bond and fix it. Step S3: Install the flexible compression ring (15) onto the first flexible support ring (14) and install the mirror frame (12) onto the main frame (5); Step S4: Install the beam splitter body in the second flexible support ring (18) and inject glue to bond and fix it; Step S5: Install the second flexible support ring (18) into the flexible mounting base (20) and inject glue to bond and fix it. Step S6: Connect the flexible mounting base (20) to the adapter (16), and connect the adapter (16) to the main frame (5).

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