A fixing and adjusting method for spatial concave grating

Abstract

The application discloses a spatial concave grating fixing device, fixing method and assembling and adjusting method, which comprises a concave grating, a grating sleeve and a grating shell, one side of the concave grating is an inner concave surface which is a grating ruling surface, the other side of the concave grating has a cylindrical convex which is a reflecting surface far away from the end surface of the concave grating; the grating sleeve is sleeved on the cylindrical convex of the concave grating, three bosses are uniformly arranged on the side of the grating sleeve far away from the concave grating and close to the edge; the grating sleeve is installed in the grating shell, long circular holes are formed on the side of the grating shell close to the grating sleeve and corresponding to the bosses, and the grating shell and the grating sleeve are connected through the screws penetrating through the long circular holes and the corresponding bosses. The application is more reliable in fixing, more convenient in assembling and adjusting, can finely adjust the grating under the whole optical system, and can still keep the optical position to meet the precision requirement under the complex environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spectrometer technology, and in particular to a space concave grating fixing and adjusting method. BACKGROUND

[0002] The imaging spectrometer is an important branch in the field of space optical remote sensing at present, and the traditional Dyson spectrometer includes a Dyson lens and a concave grating, which has the advantages of small volume and light weight and is concerned by the aerospace field. As an important optical element of the spectrometer design, the concave grating plays a great role, and in the face of the harsh environmental conditions and node examination in the aerospace field, how to quickly complete the fixing and adjusting of the concave grating is a key problem. In the past, the concave grating is fixed and adjusted by adopting a lens barrel, and is adjusted by a spacer and a threaded compression ring. This method is not suitable for optical systems with large intercepts, and the grating tilt and pitch cannot be finely adjusted.

[0003] Therefore, the person skilled in the art provides a space concave grating fixing and adjusting method to solve the problems in the background. SUMMARY

[0004] The present application provides a space concave grating fixing and adjusting method which can finely adjust the grating in the whole optical system without affecting the grating surface shape, can ensure that the optical position still meets the accuracy requirements under complex environments such as vibration, impact and alternating temperature load, and has small volume and light weight.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme:

[0006] A space concave grating fixing device comprises:

[0007] The concave grating has an inner concave surface on one side, which is a grating ruling surface, and has a cylindrical protrusion on the other side, and the end surface of the cylindrical protrusion away from the concave grating is a reflecting surface.

[0008] The grating sleeve is sleeved on the cylindrical protrusion of the concave grating, three bosses are uniformly arranged on the side surface of the grating sleeve away from the concave grating and close to the edge, and a through hole accommodating the cylindrical protrusion is formed in the middle of the side surface of the grating sleeve away from the concave grating.

[0009] The grating sleeve is installed in the grating shell, long round holes are formed on the side surface of the grating shell close to the grating sleeve and corresponding to the bosses, and the grating shell and the grating sleeve are connected by screws passing through the long round holes and the corresponding bosses.

[0010] Further, the top end of the grating shell has a first mounting angle, and the bottom end of the grating shell has two symmetrical second mounting angles.

[0011] Further, adjustment shims are arranged on the side of the grating shell away from the long circular hole.

[0012] Further, the gap between the cylindrical protrusion and the through hole on the grating sleeve is 0.005mm.

[0013] Further, the grating sleeve is made of 4J32 material.

[0014] Further, the grating shell is made of 7A09 aluminum alloy material.

[0015] A fixing method of a spatial concave grating, comprising the following steps:

[0016] Step one: the concave grating is adhered to the grating sleeve by optical epoxy adhesive, and the annular surface of the cylindrical protrusion of the concave grating cooperates with the grating sleeve with a gap of 0.005mm;

[0017] Step two: three threaded holes are drilled on the three bosses of the grating sleeve for fixing, and a flexible joint is processed for eliminating internal stress;

[0018] Step three: the adhered concave grating and grating sleeve are fixed to the grating shell by screws, the screws pass through the long circular hole on the grating shell and the corresponding bosses, and the position of the long circular hole can be adjusted to adjust the angle of the concave grating within ±10°; the grating shell is installed on the optical system by screws passing through a first mounting angle and two second mounting angles on the grating shell and adjustment shims.

[0019] A mounting and adjusting method of a spatial concave grating, comprising the following steps:

[0020] Step one: the adhered grating sleeve and concave grating are fixed to the grating shell;

[0021] Step two: the grating shell is butted to the optical system, the whole mounting and adjusting process is monitored by a high-precision theodolite on the reflecting surface of the concave grating, the rotating position of the concave grating is recorded in real time, and the position is ensured to be accurate and correct;

[0022] Step three: after preliminary fixation by memory rubber, the imaging quality is observed by a detector, the concave grating is rotated through the position of the long circular hole on the grating shell, and the appropriate direction is found;

[0023] Step four: the concave grating is adjusted along the axial direction of the optical system, the tilt and pitch along the optical axis direction are controlled by adjusting the memory rubber, the clear image is obtained by continuously adjusting and feedback by the detector, the thickness of the memory rubber is measured, and the thickness of the adjustment shims at the three mounting angles is determined.

[0024] Step five: a plane is determined by three points, based on which the adjusting pad is processed, and then the concave grating, grating sleeve and grating shell are butted to the optical system through the adjusting pad, the adjustment result is checked, and the image quality is judged to meet the requirements, and then the adjustment is completed.

[0025] In the above technical solution, the spatial concave grating fixing and adjustment method provided by the application has the following beneficial effects: the fixing of the spatial concave grating is more reliable, and the adjustment is more rapid and convenient; the grating is finely adjusted under the whole optical system, while the optical position can still meet the precision requirement under complex environments such as vibration, impact and alternating temperature load, and the occupied volume is small and the weight is light. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0027] Figure 1 A sectional view of the concave grating in the spatial concave grating fixing device provided by the embodiment of the present application;

[0028] Figure 2 A structural schematic view of the concave grating in the spatial concave grating fixing device provided by the embodiment of the present application;

[0029] Figure 3 A connection structural schematic view of the concave grating and the grating sleeve in the spatial concave grating fixing device provided by the embodiment of the present application;

[0030] Figure 4 A front view of the spatial concave grating fixing device provided by the embodiment of the present application;

[0031] Figure 5 A connection structural schematic view of the grating shell and the adjusting pad in the spatial concave grating fixing device provided by the embodiment of the present application;

[0032] Figure 6 A use state reference view of the spatial concave grating fixing device provided by the embodiment of the present application.

[0033] Explanation of reference signs:

[0034] 10, concave grating; 11, inner concave surface; 12, cylindrical protrusion;

[0035] 20, grating sleeve; 21, boss; 22, through hole;

[0036] 30, grating shell; 31, oblong hole; 32, first installation angle; 33, second installation angle;

[0037] 40, adjusting gasket;

[0038] 50, optical system; 51, theodolite; 52, detector; 53, optical axis. DETAILED DESCRIPTION

[0039] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings.

[0040] Referring to Figures 1-6 as shown;

[0041] The spatial concave grating fixing device provided by the embodiment of the present application comprises:

[0042] The concave grating 10 has an inner concave surface 11 on one side, which is a grating ruling surface, and has a cylindrical protrusion 12 on the other side, the end surface of which away from the concave grating 10 being a reflecting surface;

[0043] The grating sleeve 20 is sleeved on the cylindrical protrusion 12 of the concave grating 10, and three bosses 21 are uniformly arranged on the side surface of the grating sleeve 20 away from the concave grating 10 and close to the edge, and a through hole 22 accommodating the cylindrical protrusion 12 is formed in the middle of the side surface of the grating sleeve 20 away from the concave grating 10;

[0044] The grating sleeve 20 is installed in the grating shell 30, and an oblong hole 31 is formed on the side surface of the grating shell 30 close to the grating sleeve 20 and corresponding to the bosses 21, and the grating shell 30 and the grating sleeve 20 are connected through screws passing through the oblong hole 31 and the corresponding bosses 21; the top end of the grating shell 30 has a first installation angle 32, and the bottom end of the grating shell 30 has two symmetrical second installation angles 33.

[0045] The side surface of the grating shell 30 away from the oblong hole 31 is provided with an adjusting gasket 40.

[0046] The gap between the cylindrical protrusion 12 and the through hole on the grating sleeve 20 is 0.005 mm; the grating sleeve 20 is made of TC4 material; and the grating shell 30 is made of 7A09 aluminum alloy material.

[0047] A spatial concave grating fixing method comprises the following steps:

[0048] Step one: the concave grating 10 is adhered to the grating sleeve 20 by optical epoxy, the annular surface of the cylindrical convex 12 of the concave grating 10 is matched with the grating sleeve 20 with a clearance of 0.005mm;

[0049] Step two: three threaded holes are drilled on each of the three bosses 21 of the grating sleeve 20 for fixation, and a flexible joint is processed for eliminating internal stress;

[0050] Step three: the adhered concave grating 10 and grating sleeve 20 are fixed to the grating shell 30 by screws, the screws pass through the long circular hole 31 on the grating shell 30 and the corresponding boss 21, and the angle of the concave grating 10 can be adjusted within ±10° by adjusting the position of the long circular hole 31; the grating shell 30 is installed on the optical system 50 by screws passing through a first installation angle 32 and two second installation angles 33 on the grating shell 30 and adjusting the gasket 40.

[0051] The spatial concave grating fixing device and method make the fixing of the spatial concave grating more reliable and the assembly and adjustment more convenient.

[0052] A spatial concave grating assembly and adjustment method, comprising the following steps:

[0053] Step one: the adhered grating sleeve 20 and concave grating 10 are fixed to the grating shell 30;

[0054] Step two: the grating shell 30 is butted to the optical system 50, the whole assembly and adjustment process is monitored by the reflecting surface of the concave grating 10 by the high-precision theodolite 51, the rotating position of the concave grating 10 is recorded in real time to ensure the accuracy of the position;

[0055] Step three: after preliminary fixation by memory rubber, the imaging quality is observed by the detector 52, the concave grating 10 is rotated by the position of the long circular hole 31 on the grating shell 30 until the horizontal and vertical directions of the displayed spectral image are aligned, and the screws on the back of the grating sleeve 20 are tightened and fixed;

[0056] Step four: the concave grating 10 is adjusted along the optical axis 53 of the optical system 50, the inclination and pitch along the optical axis 53 are controlled by adjusting the memory rubber, the clear image is obtained by continuously adjusting and feedback by the detector 52, the thickness of the memory rubber is measured, and the thickness of the three installation angles of the adjustment gasket 40 is determined;

[0057] Step five: a plane is determined by three points, the adjustment gasket 40 is processed based on this, and the concave grating 10, the grating sleeve 20 and the grating shell 30 are butted to the optical system 50 through the adjustment gasket 40, the assembly and adjustment result is verified, the image quality is judged to meet the requirements, and the assembly and adjustment is completed.

[0058] The foregoing merely illustrates some exemplary embodiments of the application, and it will be appreciated that those skilled in the art will be able to devise various modifications without departing from the spirit and scope of the application. The appended drawings and description are illustrative only, and are not intended to be limiting.

Claims

1. A method for fixing and adjusting a spatial concave grating, characterized in that: Includes the following steps: Step 1: The concave grating (10) is bonded to the grating sleeve (20) with optical epoxy adhesive. The annular surface of the cylindrical protrusion (12) of the concave grating (10) and the grating sleeve (20) have a clearance of 0.005 mm. Step 2: Three threaded holes are drilled on the three bosses (21) of the grating sleeve (20) for fixing, and flexible joints are machined to eliminate internal stress. Step 3: Fix the glued concave grating (10) and grating sleeve (20) to the grating shell (30) with screws. The screws pass through the elongated hole (31) and the corresponding boss (21) on the grating shell (30). By adjusting the position of the elongated hole (31), the angle of the concave grating (10) can be adjusted within ±10°. The grating shell (30) is installed on the optical system by screws passing through a first mounting angle (32) and two second mounting angles (33) and the adjusting shim (40). The entire assembly and adjustment process is monitored by a high-precision theodolite on the reflective surface of the concave grating (10) and the rotation position of the concave grating (10) is recorded in real time to ensure that the position is accurate. Step 4: After initial fixation with memory rubber, observe the imaging quality with a detector. Rotate the concave grating (10) through the position of the elongated hole (31) on the grating shell (30) to find the appropriate direction. Step 5: Adjust the concave grating (10) along the optical axis in the optical system. Control the tilt and pitch along the optical axis by adjusting the memory rubber. Feedback is obtained through the detector again. After obtaining a clear image through continuous adjustment, the thickness of the memory rubber is measured to determine the thickness of the three mounting corners of the adjustment shim (40). Step 6: Determine a plane by three points, and process and adjust the shim (40) based on this. Then, pass the concave grating (10), grating sleeve (20) and grating shell (30) through the adjustment shim (40) and connect them to the optical system. Verify the assembly and adjustment results. After determining that the image quality meets the requirements, the assembly and adjustment is completed.

2. The apparatus according to claim 1, applied to a method for fixing and adjusting a spatial concave grating, is characterized in that, include: A concave grating (10) has one side surface of an inner concave surface (11), which is the grating marking surface. The other side surface of the concave grating (10) has a cylindrical protrusion (12), and the end face of the cylindrical protrusion (12) away from the concave grating (10) is a reflective surface. A grating sleeve (20) is fitted onto the cylindrical protrusion (12) of the concave grating (10). Three protrusions (21) are evenly arranged on the side of the grating sleeve (20) away from the concave grating (10) and near the edge. A through hole (22) for accommodating the cylindrical protrusion (12) is opened in the middle of the side of the grating sleeve (20) away from the concave grating (10). The grating housing (30) is installed inside the grating sleeve (20). An elongated hole (31) is provided on the side of the grating housing (30) near the grating sleeve (20) at a position corresponding to the boss (21). The grating housing (30) and the grating sleeve (20) are connected by screws passing through the elongated hole (31) and the corresponding boss (21).

3. The apparatus according to claim 2 for fixing and adjusting a spatial concave grating, characterized in that: The top end of the grating shell (30) has a first mounting angle (32), and the bottom end of the grating shell (30) has two symmetrical second mounting angles (33).

4. The apparatus according to claim 3 for fixing and adjusting a spatial concave grating, characterized in that: An adjustment shim (40) is provided on the side of the grating housing (30) away from the elongated hole (31).

5. The apparatus according to claim 4 for fixing and adjusting a spatial concave grating, characterized in that: The gap between the cylindrical protrusion (12) and the through hole on the grating sleeve (20) is 0.005 mm.

6. The apparatus according to claim 2 for fixing and adjusting a spatial concave grating, characterized in that: The grating sleeve (20) is made of TC4 material.

7. The apparatus according to claim 2 for fixing and adjusting a spatial concave grating, characterized in that: The grating shell (30) is made of 7A09 aluminum alloy.

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