A method and device for calibrating the spin direction of a dispersion prism

Abstract

The application discloses a kind of dispersion prism self-rotating direction's calibration method and device, the method includes: the dispersion prism, flat mirror and theodolite are placed according to measurement light path;Adjust the angle of theodolite, precision measuring mirror and flat mirror, make the self-rotating image reflected by flat mirror coincide with the cross wire in theodolite ocular, obtain initial angle;The geometry of the back surface, front surface and front end face of dispersion prism is fitted using multiple points, obtain first spherical surface, second spherical surface and first plane;Second plane where dispersion prism is located is fitted;Based on initial angle, adjust the angle of precision measuring mirror, theodolite and flat mirror, make the self-rotating image returned by flat mirror coincide with the cross wire of theodolite;Measure the target included angle of second plane and fourth plane, and take the target included angle as the final calibration value of the self-rotating direction of dispersion prism.The above-mentioned method introduces the reference of the self-rotating direction of dispersion prism to precision measuring mirror, and improves the calibration accuracy of the self-rotating direction and the assembling efficiency of dispersion prism.

Description

Technical Field

[0001] This invention relates to the field of optical instrument assembly and adjustment technology, and in particular to a method and apparatus for calibrating the spin direction of a dispersive prism. Background Technology

[0002] A dispersive prism is a dispersive optical element widely used in off-axis multi-reflector optical systems. The machined reference planes of a dispersive prism are typically used to determine its precise position and orientation within the optical system. However, once the dispersive prism is installed in the optical system, these reference planes may be obstructed or not directly accessible, making it impossible to directly measure its position and orientation. To ensure proper installation and adjustment of the dispersive prism within the system, it is necessary to establish a reference for its spin direction in a measurable position. This is usually achieved by mounting a precision measuring mirror (or other measurement aid) externally to the dispersive prism. The precision measuring mirror serves as a reference for the spin direction of the dispersive prism, facilitating subsequent measurements and adjustments. By mounting a precision measuring mirror externally to the dispersive prism, the spin direction reference of the dispersive prism can be established in a measurable position.

[0003] Currently, the installation and adjustment of precision measuring instruments are usually done manually, which is not only inefficient but also difficult to meet the requirements of high-precision adjustment. Summary of the Invention

[0004] This invention aims to at least solve the technical problems existing in the prior art. To this end, the first aspect of this invention proposes a method for calibrating the spin direction of a dispersive prism, characterized in that the method includes:

[0005] Arrange the dispersive prism, plane mirror, and theodolite, which have been fitted with the precision measuring mirror, according to their positional relationship in the measurement optical path;

[0006] Adjust the angles of the theodolite, the precision measuring mirror, and the plane mirror so that two autocollimated images returned by the precision measuring mirror and the plane mirror appear simultaneously in the field of view of the theodolite, and make the autocollimated image reflected by the plane mirror coincide with the crosshairs in the eyepiece of the theodolite. At this time, read the pitch angle scale on the theodolite to obtain the initial angle.

[0007] Using the probe of a coordinate measuring machine, multiple points are collected on the rear surface, front surface, and front end face of the dispersive prism. The geometric shapes of the rear surface, front surface, and front end face of the dispersive prism are then fitted on a computer using these multiple points to obtain the first sphere, the second sphere, and the first plane, respectively.

[0008] On the computer, the optical axes of the rear and front surfaces of the dispersive prism are fitted using the first sphere, the second sphere, and the first plane, and the second plane where the dispersive prism is located is also fitted.

[0009] Based on the initial angle, adjust the angles of the precision measuring mirror, the theodolite, and the plane mirror so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite, thereby ensuring that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches a preset accuracy.

[0010] Fine-tune the position and orientation of the precision measuring mirror, and fix the precision measuring mirror when the optical axis of the precision measuring mirror is aligned with the optical axis of the theodolite;

[0011] Multiple points are collected on the surface of the precision measuring mirror to fit a fourth plane on the computer;

[0012] The target angle between the second plane and the fourth plane is measured, and the target angle is used as the final calibration value of the spin direction of the dispersive prism.

[0013] Optionally, arranging the dispersive prism, plane mirror, and theodolite, which have been fitted with the precision measuring mirror, according to their positional relationship in the measurement optical path includes:

[0014] The dispersive prism with the precision measuring mirror already installed is mounted on the base of the coordinate measuring machine using a support fixture; the plane mirror is mounted on the base using a lifting frame;

[0015] The theodolite is mounted on a two-dimensional adjustment frame; the two-dimensional adjustment frame is located beside the base platform;

[0016] The mirror surfaces of the dispersive prism and the plane mirror are placed vertically in space;

[0017] The center of the dispersive prism, the center of the plane mirror, and the center of the theodolite are aligned in a straight line.

[0018] Optionally, before mounting the dispersive prism with the precision measuring mirror installed on the base of the coordinate measuring machine using a support fixture, the following steps are also included:

[0019] The precision measuring mirror is mounted on the side of the dispersive prism frame using a precision measuring mirror adapter.

[0020] Install probes on the measuring head of the coordinate measuring machine and calibrate it.

[0021] Optionally, the step of fitting the optical axes of the rear and front surfaces of the dispersive prism using the first sphere, the second sphere, and the first plane on a computer, and fitting the second plane where the dispersive prism is located, includes:

[0022] A first perpendicular line segment from the first sphere to the first plane and a second perpendicular line segment from the second sphere to the first plane are fitted on a computer; the first perpendicular line segment is the optical axis of the rear surface and the second perpendicular line segment is the optical axis of the front surface.

[0023] The plane containing the first perpendicular line segment and the second perpendicular line segment is fitted to obtain the second plane; the second plane is the plane containing the optical axis of the dispersive prism.

[0024] Optionally, adjusting the angles of the precision measuring mirror, the theodolite, and the plane mirror based on the initial angle, so that the autocollimated image returned by the plane mirror coincides with the crosshairs of the theodolite, to ensure that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches a preset accuracy, includes:

[0025] The coordinate measuring machine is used to collect multiple points on the reflecting surface of the plane mirror, and the multiple points are used to fit a third plane; the third plane is the reflecting surface of the plane mirror.

[0026] The angle between the second plane and the third plane is measured on the computer to obtain the second angle.

[0027] The third angle that the precision measuring mirror needs to be adjusted is calculated based on the second angle, so that the second plane and the third plane are perpendicular;

[0028] The pitch angle of the theodolite is adjusted to a fourth angle, which is the sum of the initial angle and the third angle;

[0029] Adjust the angle of the plane mirror so that the autocollimated image returned by the plane mirror coincides with the crosshairs of the theodolite;

[0030] Multiple points on the reflecting surface of the plane mirror are collected again, and the third plane is fitted again using the multiple points. The angles of the precision measuring mirror, the theodolite, and the plane mirror are adjusted again so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite.

[0031] After multiple adjustments, when the third angle that the precision measuring mirror needs to be adjusted next is less than or equal to the preset angle, it is determined that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches the preset accuracy.

[0032] Optionally, the fine-tuning of the position of the measuring mirror, ensuring that the optical axis of the measuring mirror is aligned with the optical axis of the theodolite, and then fixing the measuring mirror, includes:

[0033] Adjust the position and orientation of the precision measuring mirror so that the autocollimated image reflected by the precision measuring mirror coincides with the crosshairs, thereby ensuring that the optical axis of the precision measuring mirror is aligned with the optical axis of the theodolite;

[0034] Fix the precision measuring mirror, and during the process of fixing the precision measuring mirror, continuously monitor the alignment status of the autocollimation image in the theodolite with the crosshairs to ensure that the autocollimation image and the crosshairs always remain coincident.

[0035] The second aspect of the present invention provides a calibration device for the spin direction of a dispersive prism, the device comprising: a coordinate measuring machine, a dispersive prism assembly, a plane mirror, a lifting frame, an air-bearing platform, a theodolite, a two-dimensional adjustment frame, and supporting fixtures;

[0036] The coordinate measuring machine can adjust the position of the probe mounted on it in the X, Y, and Z directions. The probe is used to collect the coordinates of points on the surface of the dispersive prism.

[0037] The plane mirror is mounted on the lifting frame, the dispersive prism assembly is mounted on the support fixture, and the lifting frame and the support fixture are mounted on the base of the coordinate measuring machine; the coordinate measuring machine is mounted on the air-bearing platform; the theodolite is mounted on the two-dimensional adjustment frame.

[0038] The lifting frame, the supporting fixture, and the two-dimensional adjustment frame are respectively used to fix and adjust the position and orientation of the plane mirror, the dispersive prism, and the theodolite;

[0039] The dispersive prism assembly includes a dispersive prism and a precision measuring mirror. The dispersive prism is used to decompose the incident light into spectra of different wavelengths, and the precision measuring mirror is used to calibrate the output spectrum of the dispersive prism.

[0040] Optionally, the coordinate measuring machine includes an X-axis translation component, a Y-axis translation component, a Z-axis lifting component, a probe, and a base.

[0041] The Y-axis translation component is slidably connected to the base platform and is perpendicular to the base platform; the X-axis translation component is fixedly connected to the Y-axis translation component and is perpendicular to the Y-axis translation component; the Z-axis lifting component is slidably connected to the X-axis translation component and is perpendicular to the X-axis translation component.

[0042] The probe is installed at the bottom of the Z-axis lifting assembly.

[0043] Optionally, the dispersive prism assembly further includes a dispersive prism frame, a dispersive prism bonding ring, and a precision measuring mirror adapter.

[0044] The dispersive prism frame is used to fix and support the dispersive prism by means of the dispersive prism bonding ring, and the precision measuring mirror is installed on the side of the dispersive prism frame by means of the precision measuring mirror adapter.

[0045] The present invention has the following beneficial effects:

[0046] The method for calibrating the spin direction of a dispersive prism provided in this invention involves arranging the dispersive prism, plane mirror, and theodolite (with a precision measuring mirror already installed) according to the positional relationship of the measurement optical path; adjusting the angles of the theodolite, the precision measuring mirror, and the plane mirror so that two autocollimated images returned by the precision measuring mirror and the plane mirror simultaneously appear in the theodolite's field of view, and aligning the autocollimated image reflected by the plane mirror with the crosshairs in the theodolite's eyepiece; then reading the pitch angle scale on the theodolite to obtain the initial angle; using the probe of a coordinate measuring machine to collect multiple points on the rear, front, and front surfaces of the dispersive prism, and using these multiple points on a computer to fit the geometry of the rear, front, and front surfaces of the dispersive prism to obtain a first sphere, a second sphere, and a first plane, respectively; and then using the data collected on the computer... The first sphere, the second sphere, and the first plane are used to fit the optical axes of the rear and front surfaces of the dispersive prism, and to fit the second plane where the dispersive prism is located. Based on the initial angle, the angles of the precision measuring mirror, the theodolite, and the plane mirror are adjusted so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite, ensuring that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches a preset accuracy. The pose of the precision measuring mirror is fine-tuned, and when the optical axis of the precision measuring mirror is aligned with the optical axis of the theodolite, the precision measuring mirror is fixed. Multiple points are collected on the surface of the precision measuring mirror to fit a fourth plane on the computer. The target angle between the second plane and the fourth plane is measured, and the target angle is used as the final calibration value of the spin direction of the dispersive prism. The above method utilizes computer fitting of the optical axis and plane during manual adjustment, which can bring out the reference of the spin direction of the dispersive prism to the precision measuring mirror. This can provide a reference in the spin direction for the high-precision integration of the dispersive prism, thereby improving the calibration accuracy of the spin direction and the assembly and adjustment efficiency of the dispersive prism. Attached Figure Description

[0047] Figure 1 A mechanical structure diagram of a calibration device for the spin direction of a dispersive prism provided in an embodiment of the present invention;

[0048] Figure 2 This is a front view of a dispersive prism provided in an embodiment of the present invention;

[0049] Figure 3 This is a cross-sectional view of a dispersive prism assembly provided in an embodiment of the present invention;

[0050] Figure 4 This is a flowchart illustrating the steps of a method for calibrating the spin direction of a dispersive prism according to an embodiment of the present invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1-Coordinate measuring machine; 11-X-axis translation assembly; 12-Z-axis lifting assembly; 13-Probe; 14-Y-axis translation assembly; 15-Base platform; 2-Dispersion prism assembly; 21-Dispersion prism; 211-Front surface of dispersion prism; 212-Rear surface of dispersion prism; 213-Front end face of dispersion prism; 22-Frame of dispersion prism; 23-Bonding ring of dispersion prism; 24-Precision measuring mirror; 25-Adaptor fixture for precision measuring mirror; 3-Plane mirror; 4-Lifting frame; 5-Air-float platform; 6-Theodolite; 7-Two-dimensional adjustment frame; 8-Support fixture. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, the use of "based on" or "according to" implies openness and inclusiveness, because processes, steps, calculations, or other actions "based on" or "according to" one or more of the stated conditions or values ​​may in practice be based on additional conditions or beyond the stated values.

[0055] Figure 1 This is a mechanical structure diagram of a calibration device for the spin direction of a dispersive prism 21 provided in an embodiment of the present invention.

[0056] like Figure 1 As shown, the device includes: a coordinate measuring machine 1, a dispersive prism assembly 22, a plane mirror 3, a lifting frame 4, an air-bearing platform 5, a theodolite 6, a two-dimensional adjustment frame 7, and a support fixture 8.

[0057] The coordinate measuring machine 1 can adjust the position of the probe 13 mounted on it in the X, Y, and Z directions. The probe 13 is used to collect the coordinates of points on the surface of the dispersive prism 21.

[0058] The plane mirror 3 is mounted on the lifting frame 4, the dispersive prism assembly 22 is mounted on the support fixture 8, the lifting frame 4 and the support fixture 8 are mounted on the base 15 of the coordinate measuring machine 1; the coordinate measuring machine 1 is mounted on the air-bearing platform 5; the theodolite 6 is mounted on the two-dimensional adjustment frame 7; the lifting frame 4, the support fixture 8 and the two-dimensional adjustment frame 7 are used to fix and adjust the position and orientation of the plane mirror 3, the dispersive prism 21 and the theodolite 6 respectively.

[0059] The dispersive prism assembly 22 includes a dispersive prism 21 and a precision measuring mirror 24. The dispersive prism 21 is used to decompose the incident light into spectra of different wavelengths, and the precision measuring mirror 24 is used to calibrate the output spectrum of the dispersive prism 21.

[0060] Specifically, the coordinate measuring machine 1 is a high-precision measuring device that can move the probe 13 in the X, Y, and Z directions to collect coordinate data of points on the surface of the dispersive prism 21.

[0061] The plane mirror 3 is used to reflect light and is mounted on the lifting frame 4 as part of the reference optical path.

[0062] The lifting frame 4 is used to fix and adjust the height and angle of the plane mirror 3 to ensure the alignment of the light path.

[0063] The air-floating platform 5 is a high-precision support platform that uses air cushions to reduce vibration and friction, ensuring the stability of the measurement environment.

[0064] The coordinate measuring machine 1 is mounted on the air-bearing platform 5 to reduce the impact of vibration and friction on measurement accuracy. The theodolite 6 is an optical instrument used to measure angles and to observe and calibrate the optical path.

[0065] The two-dimensional adjustment frame 7 is used to fix and adjust the position and angle of the theodolite 6 to ensure that it is aligned with the optical path.

[0066] The support fixture 8 is used to fix the dispersive prism assembly 22 to ensure its stability during the measurement process.

[0067] As an optional embodiment, the coordinate measuring machine 1 includes an X-axis translation component 11, a Y-axis translation component 14, a Z-axis lifting component 12, a probe 13, and a base 15; the Y-axis translation component 14 is slidably connected to the base 15 and is perpendicular to the base 15; the X-axis translation component 11 is fixedly connected to the Y-axis translation component 14 and is perpendicular to the Y-axis translation component 14; the Z-axis lifting component 12 is slidably connected to the X-axis translation component 11 and is perpendicular to the X-axis translation component 11; the probe 13 is installed at the bottom end of the Z-axis lifting component 12.

[0068] Specifically, the X-axis translation component 11 is responsible for the movement of the probe 13 in the X-axis direction (usually the horizontal direction).

[0069] The Y-axis translation component 14 is responsible for the movement of the probe 13 in the Y-axis direction (usually a horizontal direction perpendicular to the X-axis). The Z-axis lifting component 1213 is responsible for the movement of the probe 13 in the Z-axis direction (usually a vertical direction).

[0070] like Figure 1 As shown, the Y-axis translation component 14 is connected to the base platform 15 via a guide rail or slider and can slide in the Y-axis direction. The X-axis translation component 11 is mounted on the Y-axis translation component 14 and moves together with the Y-axis translation component 14. The Z-axis lifting component 12 is connected to the X-axis translation component 11 via a guide rail or slider and can slide in the Z-axis direction.

[0071] The probe 13 is installed at the bottom of the Z-axis lifting assembly 12 and is used to contact or scan the surface of the object being measured to collect the coordinate data of the point.

[0072] The base platform 15 is the basic platform of the coordinate measuring machine 1, used to support the entire equipment. It is usually made of high-rigidity materials, such as granite, marble or aluminum alloy, to ensure stability.

[0073] As an optional embodiment, the dispersive prism assembly 22 further includes a dispersive prism frame 22, a dispersive prism 21 bonding ring 23, and a precision measuring mirror 24 adapter 25; the dispersive prism frame 22 is used to fix and support the dispersive prism 21 through the dispersive prism 21 bonding ring 23, and the precision measuring mirror 24 is mounted on the side of the dispersive prism frame 22 through the precision measuring mirror 24 adapter 25.

[0074] Figure 2 This is a front view of a dispersive prism 21 provided in an embodiment of the present invention.

[0075] Figure 3 This is a cross-sectional view of a dispersive prism assembly 22 provided in an embodiment of the present invention.

[0076] like Figure 2 As shown, the dispersive prism assembly 22 includes a dispersive prism frame 22, a dispersive prism 21 bonding ring 23, a precision measuring mirror 24, and a precision measuring mirror 24 adapter 25. The dispersive prism assembly 22 is mounted on the support fixture 8.

[0077] like Figure 3 As shown, the dispersive prism 21 includes a front surface 211, a rear surface 212, and a front end surface 213.

[0078] The dispersive prism 21 is the core optical element of the dispersive prism assembly 22, used to decompose incident light into different wavelengths of the spectrum. The dispersive prism frame 22 is a mechanical structure used to fix and support the dispersive prism 21, and is usually made of metal or high-strength plastic to ensure the stability and durability of the structure.

[0079] The dispersive prism 21 adhesive ring 23 is used to fix the dispersive prism 21 inside the frame 22. It is usually made of an elastic material (such as rubber or silicone) and can provide a buffer between the prism and the frame 22 to prevent stress concentration caused by temperature changes or mechanical vibration.

[0080] The precision measuring mirror 24 is used to calibrate the output spectrum of the dispersive prism 21 to ensure the accuracy and consistency of the spectrum.

[0081] The precision measuring mirror 24 adapter 25 is used to mount the precision measuring mirror 24 on the side of the dispersive prism frame 22. The adapter 25 typically includes a fine-tuning mechanism that allows the precision measuring mirror 24 to be precisely positioned in multiple dimensions to ensure its alignment with the optical path of the dispersive prism 21.

[0082] In summary, the dispersive prism spin direction calibration device provided in this embodiment of the invention includes: a coordinate measuring machine (CMM), a dispersive prism assembly, a plane mirror, a lifting frame, an air-bearing platform, a theodolite, a two-dimensional adjustment frame, and a support fixture; the CMM can adjust the position of a probe mounted on it in the X, Y, and Z directions, and the probe is used to collect the coordinates of points on the surface of the dispersive prism; the plane mirror is mounted on the lifting frame, the dispersive prism assembly is mounted on the support fixture, and the lifting frame and the support fixture are mounted on the base of the CMM; the CMM is mounted on the air-bearing platform; the theodolite is mounted on the two-dimensional adjustment frame; the lifting frame, the support fixture, and the two-dimensional adjustment frame are respectively used to fix and adjust the pose of the plane mirror, the dispersive prism, and the theodolite; the dispersive prism assembly includes a dispersive prism and a precision measuring mirror, the dispersive prism is used to decompose the incident light into spectra of different wavelengths, and the precision measuring mirror is used to calibrate the output spectrum of the dispersive prism. The aforementioned device can use a coordinate measuring machine to sample multiple surfaces of the dispersive prism and fit the optical axis plane. During the process, a theodolite and a plane mirror are used to assist in the installation of the precision measuring mirror. The angle of the precision measuring mirror is adjusted through multiple sets of measurements, thereby bringing the reference of the spin direction of the dispersive prism to the precision measuring mirror. This can provide a reference in the spin direction for the high-precision integration of the dispersive prism, improving the calibration accuracy of the spin direction and the assembly and adjustment efficiency of the dispersive prism.

[0083] Figure 4 This is a flowchart illustrating the steps of a method for calibrating the spin direction of a dispersive prism according to an embodiment of the present invention. This method is applied to... Figure 1 The calibration device for the spin direction of the dispersive prism in the image, such as... Figure 4 As shown, the method includes the following steps:

[0084] Step 101: Arrange the dispersive prism, plane mirror, and theodolite, which have been fitted with the precision measuring mirror, according to their positional relationship in the measurement optical path.

[0085] This step is a preparatory step, ensuring that all optical components (dispersion prisms, plane mirrors, theodolites) are arranged according to the predetermined optical path.

[0086] The dispersive prism is the object to be measured, used to decompose the incident light into spectra of different wavelengths.

[0087] A precision measuring mirror is used to calibrate the output spectrum of a dispersive prism, ensuring the accuracy and consistency of the spectrum. A plane mirror is used to reflect light, and a theodolite is an optical instrument used to measure angles and to observe and calibrate the optical path.

[0088] Step 102: Adjust the angles of the theodolite, the precision measuring mirror, and the plane mirror so that two autocollimated images returned by the precision measuring mirror and the plane mirror appear simultaneously in the field of view of the theodolite, and make the autocollimated image reflected by the plane mirror coincide with the crosshairs in the eyepiece of the theodolite. At this time, read the pitch angle scale on the theodolite to obtain the initial angle.

[0089] By adjusting the angle, ensure that the theodolite can simultaneously see the reflected images from both the precision measuring mirror and the plane mirror. When the reflected image from the plane mirror coincides with the crosshairs, it indicates that the reflecting surface of the plane mirror is aligned with the optical axis of the theodolite. The recorded elevation angle at this point serves as the reference for subsequent adjustments.

[0090] Step 103: Use the probe of a coordinate measuring machine to collect multiple points on the rear surface, front surface, and front end face of the dispersive prism, and use the multiple points to fit the geometry of the rear surface, front surface, and front end face of the dispersive prism on a computer to obtain the first sphere, the second sphere, and the first plane, respectively.

[0091] A coordinate measuring machine (CMM) is used to accurately measure the surface shape of a dispersive prism. By acquiring multiple points, the computer can fit the geometry of the dispersive prism, including the back surface (first sphere), the front surface (second sphere), and the front end surface (first plane).

[0092] Step 104: On the computer, use the first sphere, the second sphere, and the first plane to fit the optical axes of the rear and front surfaces of the dispersive prism, and fit the second plane where the dispersive prism is located.

[0093] By fitting the obtained geometry, the computer can further fit the optical axis of the dispersive prism (i.e., the axis of symmetry of the front and back surfaces) and the plane in which the dispersive prism is located (the second plane).

[0094] Step 105: Based on the initial angle, adjust the angles of the precision measuring mirror, the theodolite, and the plane mirror so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite, thereby ensuring that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches a preset accuracy.

[0095] By adjusting the angle, ensure that the reflecting surface of the plane mirror is perpendicular to the optical axis plane of the dispersive prism. This step is to ensure the accuracy of subsequent measurements.

[0096] Step 106: Fine-tune the position and orientation of the precision measuring mirror. Once the optical axis of the precision measuring mirror is aligned with the optical axis of the theodolite, fix the precision measuring mirror.

[0097] The optical axis of the precision measuring instrument must be strictly aligned with the optical axis of the theodolite to ensure measurement accuracy. Adjust the position of the precision measuring instrument, and once it is in place, fix it in place to prevent its position from changing.

[0098] Step 107: Collect multiple points on the target surface of the precision measuring mirror to fit a fourth plane on the computer.

[0099] By collecting multiple points on the surface of the precision measuring mirror, the computer can fit a fourth plane, which is related to the optical axis of the precision measuring mirror.

[0100] Step 108: Measure the target angle between the second plane and the fourth plane, and use the target angle as the final calibration value of the spin direction of the dispersive prism.

[0101] The final calibration value of the dispersive prism's spin direction can be obtained by measuring the angle between the second plane (the plane containing the dispersive prism) and the fourth plane (the plane being aimed at by the precision measuring mirror). This angle reflects the spin direction of the dispersive prism.

[0102] The included angle of the target is denoted as γ. The value of γ is used as the final calibration value of the spin direction of the dispersive prism and is recorded.

[0103] In summary, the method for calibrating the spin direction of a dispersive prism provided in this embodiment of the invention involves arranging the dispersive prism, plane mirror, and theodolite (with the precision measuring mirror already installed) according to the positional relationship of the measurement optical path; adjusting the angles of the theodolite, the precision measuring mirror, and the plane mirror so that two autocollimated images returned by the precision measuring mirror and the plane mirror simultaneously appear in the theodolite's field of view, and aligning the autocollimated image reflected by the plane mirror with the crosshairs in the theodolite's eyepiece; then reading the pitch angle scale on the theodolite to obtain the initial angle; using the probe of a coordinate measuring machine to collect multiple points on the rear, front, and front surfaces of the dispersive prism, and using these multiple points on a computer to fit the geometry of the rear, front, and front surfaces of the dispersive prism to obtain a first sphere, a second sphere, and a first plane, respectively; and then using the coordinate measuring machine's probe to collect multiple points on the computer to obtain the geometry of the rear, front, and front surfaces of the dispersive prism. The first sphere, the second sphere, and the first plane are fitted to the optical axes of the rear and front surfaces of the dispersive prism, and the second plane where the dispersive prism is located is also fitted. Based on the initial angle, the angles of the precision measuring mirror, the theodolite, and the plane mirror are adjusted so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite, ensuring that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches a preset accuracy. The pose of the precision measuring mirror is fine-tuned, and when the optical axis of the precision measuring mirror is aligned with the optical axis of the theodolite, the precision measuring mirror is fixed. Multiple points are collected on the surface of the precision measuring mirror to fit a fourth plane on the computer. The target angle between the second plane and the fourth plane is measured, and the target angle is used as the final calibration value of the spin direction of the dispersive prism. The above method utilizes computer fitting of the optical axis and plane during manual adjustment, which can bring out the reference of the spin direction of the dispersive prism to the precision measuring mirror. This can provide a reference in the spin direction for the high-precision integration of the dispersive prism, thereby improving the calibration accuracy of the spin direction and the assembly and adjustment efficiency of the dispersive prism.

[0104] As an optional embodiment, in step 101, the dispersive prism, plane mirror, and theodolite, which have been fitted with the precision measuring mirror, are arranged according to their positional relationship in the measurement optical path, specifically including:

[0105] Step 1011: Install the dispersive prism with the precision measuring mirror already installed on the base of the coordinate measuring machine using a support fixture; install the plane mirror on the base using a lifting frame.

[0106] A dispersive prism is an optical element to be measured, and its surface shape and optical axis orientation need to be precisely measured. For example... Figure 1 As shown, the color prism is fixed to the base platform by a support fixture to ensure its stable position.

[0107] Plane mirrors are used to reflect light, aiding in the alignment of the measured optical path. They are mounted on a lifting frame, facilitating subsequent adjustments to their height and angle.

[0108] The base of the coordinate measuring machine provides a stable reference platform, and the lifting frame and support fixtures are directly mounted on the base to ensure the accurate positional relationship of all optical components.

[0109] Step 1012: Set up the theodolite on the two-dimensional adjustment frame; the two-dimensional adjustment frame is located beside the base platform.

[0110] A theodolite is an optical instrument used to measure angles, observing and recording the reflected images from a measuring mirror and a plane mirror. A two-dimensional adjustment frame allows for fine-tuning of the theodolite in both horizontal and vertical directions, ensuring that its optical axis is aligned with the optical paths of the dispersive prism and the plane mirror.

[0111] The theodolite needs to be positioned at a certain distance from the dispersive prism and plane mirror. For example... Figure 1 As shown, the two-dimensional adjustment frame is placed on the side of the platform to facilitate observation and adjustment of the optical path.

[0112] Step 1013: Place the mirror surface of the dispersive prism and the mirror surface of the plane mirror vertically in space.

[0113] The mirrors of a dispersive prism and a plane mirror need to be perpendicular to each other in space. This means that their normal directions (i.e., the perpendicular directions of the mirrors) are perpendicular to each other.

[0114] This vertical relationship is to ensure that the light path can be correctly reflected and propagated, which facilitates the subsequent observation of the autocollimated image by the theodolite.

[0115] Step 1014: Align the center of the dispersive prism, the center of the plane mirror, and the center of the theodolite into a straight line.

[0116] The centers of the dispersive prism, the plane mirror, and the theodolite must lie on the same straight line. This line is the principal axis of the optical path. This ensures that the principal axis of the optical path passes through the center of all optical elements, preventing the optical path from being offset or tilted.

[0117] At the same time, it ensures that the theodolite can simultaneously observe the reflected images of the dispersive prism and the plane mirror, which facilitates subsequent angle measurement and adjustment.

[0118] Steps 1011-1014 establish a precise optical measurement system to ensure the positional relationships of the dispersive prism, plane mirror, and theodolite meet the measurement requirements. Specifically, this includes fixing the positions of the dispersive prism and plane mirror, setting up the theodolite and ensuring its adjustability, adjusting the spatial perpendicularity of the mirror surfaces to ensure the correct optical path, and ensuring that the centers of all optical elements are collinear, guaranteeing that the principal axis of the optical path passes through the centers of all elements. These operations lay the foundation for subsequent precise measurements and adjustments, ensuring the accuracy and reliability of the entire measurement process.

[0119] As an optional embodiment, before step 101, in which the dispersive prism with the precision measuring mirror already installed is mounted on the base of the coordinate measuring machine using a support fixture, the method further includes:

[0120] Step 201: Install the precision measuring mirror on the side of the dispersive prism frame using the precision measuring mirror adapter.

[0121] like Figure 1 As shown, the precision measuring mirror is mounted on the side of the dispersive prism frame via a precision measuring mirror adapter.

[0122] The precision measuring mirror is mounted on the side of the dispersive prism frame to facilitate subsequent observation of the reflected image of the precision measuring mirror using the theodolite 6, without affecting the main optical path of the dispersive prism.

[0123] Step 202: Install and calibrate the probe on the measuring head of the coordinate measuring machine.

[0124] A coordinate measuring machine (CMM) is a high-precision measuring device used to measure the geometry and position of an object. It collects coordinate data of points by having a probe contact the object's surface.

[0125] A probe is a measuring component of a coordinate measuring machine (CMM) used to contact the surface of the object being measured and collect the coordinates of points. The accuracy of the probe directly affects the accuracy of the measurement results.

[0126] Mount the probe onto the measuring head of the coordinate measuring machine, ensuring it is securely fixed and correctly positioned.

[0127] Probe calibration is performed to eliminate probe installation errors and systematic errors, ensuring the accuracy of measurement results. Calibration typically includes the following steps: (1) using a standard calibration ball or block as a reference. (2) contacting multiple points on the calibration ball with the probe and collecting data. (3) calculating and compensating for the probe's geometric parameters (such as probe radius, positional deviation, etc.) using software.

[0128] Steps 201-202 provide the necessary foundation for subsequent measurements and adjustments, ensuring the accuracy and reliability of the entire measurement process.

[0129] As an optional embodiment, step 104, which involves fitting the optical axes of the rear and front surfaces of the dispersive prism on a computer using the first sphere, the second sphere, and the first plane, and fitting the second plane where the dispersive prism is located, includes:

[0130] Step 1041: Fit a first perpendicular line segment from the first sphere to the first plane and a second perpendicular line segment from the second sphere to the first plane on a computer; the first perpendicular line segment is the optical axis of the rear surface and the second perpendicular line segment is the optical axis of the front surface.

[0131] Specifically, the first sphere is the fitting result of the rear surface of the dispersive prism, representing the geometry of the rear surface. The second sphere is the fitting result of the front surface of the dispersive prism, representing the geometry of the front surface. The first plane is the fitting result of the front surface of the dispersive prism, representing the geometry of the front surface.

[0132] The first perpendicular line segment is the perpendicular line segment from the first spherical surface (rear surface) to the first plane (front surface). The direction of the first perpendicular line segment represents the optical axis direction of the rear surface.

[0133] The second perpendicular segment is the perpendicular segment from the second spherical surface (front surface) to the first plane (front end surface). The direction of the second perpendicular segment represents the optical axis direction of the front surface.

[0134] Step 1042: Fit the plane containing the first perpendicular line segment and the second perpendicular line segment to obtain the second plane; the second plane is the plane containing the optical axis of the dispersive prism.

[0135] The first and second perpendicular line segments represent the optical axis directions of the rear and front surfaces of the dispersive prism, respectively. Using the directions of these two perpendicular line segments, the computer can fit a plane that includes these two perpendicular line segments.

[0136] The fitted plane is the second plane, which is the plane containing the optical axis of the dispersive prism. This plane represents the spatial position and orientation of the optical axis of the dispersive prism.

[0137] Steps 1041-1042, by determining the second plane where the optical axis of the dispersive prism lies, provide crucial spatial geometric information for subsequent precise adjustments and measurements, ensuring that the direction and position of the optical axis of the dispersive prism can be accurately calibrated.

[0138] As an optional embodiment, step 105, based on the initial angle, adjusts the angles of the precision measuring mirror, the theodolite, and the plane mirror so that the autocollimated image returned by the plane mirror coincides with the crosshairs of the theodolite, ensuring that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches a preset accuracy, including:

[0139] Step 1051: Use the coordinate measuring machine to collect multiple points on the reflecting surface of the plane mirror, and use the multiple points to fit a third plane; the third plane is the reflecting surface of the plane mirror.

[0140] The coordinates of multiple points on the reflecting surface of a plane mirror are collected by contacting the probe of a coordinate measuring machine. Using this collected data, the computer calculates the geometric plane of the reflecting surface (i.e., the third plane) through a fitting algorithm.

[0141] Step 1052: Measure the angle between the second plane and the third plane on the computer to obtain the second angle.

[0142] The second angle, denoted as β1, is the angle between the second and third planes, representing the deviation between the reflecting surface of the plane mirror and the optical axis plane of the dispersive prism.

[0143] Step 1053: Calculate the third angle that the precision measuring mirror needs to be adjusted based on the second angle, so that the second plane and the third plane are perpendicular.

[0144] The third angle is the angle that the precision measuring mirror needs to be adjusted to make the second plane and the third plane perpendicular. The third angle is denoted as δ, where δ = 90° - β1.

[0145] By calculating and adjusting the angle, a basis is provided for subsequent adjustments to the angles of the precision measuring mirror and the plane mirror.

[0146] Step 1054: Adjust the pitch angle of the theodolite to the fourth angle, which is the sum of the initial angle and the third angle.

[0147] The initial angle is the initial pitch angle of the theodolite recorded in step 102.

[0148] The third angle is the angle that the precision measuring mirror needs to be adjusted to make the second plane and the third plane perpendicular.

[0149] Adjust the theodolite's elevation angle to the fourth angle to ensure that the plane mirror's reflecting surface is perpendicular to the optical axis plane of the dispersive prism. The fourth angle is denoted as α2, where α2 = α1 + δ.

[0150] Step 1055: Adjust the angle of the plane mirror so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite.

[0151] The autocollimation image is the image formed in the theodolite by light rays reflected from a plane mirror. The crosshairs are reference marks in the theodolite eyepiece used for alignment.

[0152] By finely adjusting the angle of the plane mirror so that its reflected autocollimation image coincides with the crosshairs, the reflecting surface of the plane mirror can be aligned with the optical axis of the theodolite, thus ensuring that the reflecting surface of the plane mirror is perpendicular to the optical axis plane of the dispersive prism.

[0153] Step 1056: Collect multiple points on the reflecting surface of the plane mirror again, and use the multiple points to fit the third plane again. Then, adjust the angles of the precision measuring mirror, the theodolite, and the plane mirror again so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite.

[0154] By re-acquiring point data, the geometric plane of the plane mirror's reflecting surface is updated. Based on the new fitting results, the angles of the precision measuring mirror, the theodolite, and the plane mirror are further fine-tuned to ensure alignment accuracy.

[0155] Through iterative adjustments, the perpendicularity between the reflecting surface of the plane mirror and the optical axis plane of the dispersive prism can be gradually improved.

[0156] Step 1057: After multiple adjustments, when the third angle that the precision measuring mirror needs to be adjusted next is less than or equal to the preset angle, determine that the perpendicularity between the reflecting surface of the plane mirror and the optical axis plane of the dispersive prism reaches the preset accuracy.

[0157] The preset angle is a pre-set precision threshold, representing the maximum allowable adjustment angle. The preset angle can be set according to actual needs, for example, it can be set to ±5″.

[0158] If the angle that the precision measuring mirror needs to be adjusted is less than or equal to the preset angle, it means that the perpendicularity has met the requirements.

[0159] Through multiple iterative adjustments, the perpendicularity between the reflecting surface of the plane mirror and the optical axis plane of the dispersive prism is ensured to meet high-precision requirements.

[0160] Steps 1051-1057, through iterative adjustments and high-precision measurements, ensure that the perpendicularity between the plane mirror reflecting surface and the optical axis plane of the dispersive prism meets the requirements, providing a reliable reference for subsequent measurements.

[0161] As an optional embodiment, step 106, which involves fine-tuning the position of the measuring mirror and fixing it after ensuring that the optical axis of the measuring mirror is aligned with the optical axis of the theodolite, includes:

[0162] Step 1061: Adjust the position and orientation of the precision measuring mirror so that the autocollimation image reflected by the precision measuring mirror coincides with the crosshairs, thereby ensuring that the optical axis of the precision measuring mirror is aligned with the optical axis of the theodolite.

[0163] By translating and rotating, the position and orientation of the precision measuring mirror are finely adjusted so that its reflected autocollimation image coincides with the crosshairs. After coincidence, the optical axis of the precision measuring mirror is aligned with the optical axis of the theodolite, indicating that their optical paths are completely consistent.

[0164] Step 1062: Fix the precision measuring mirror, and during the process of fixing the precision measuring mirror, continuously monitor the alignment status of the autocollimation image in the theodolite with the crosshairs to ensure that the autocollimation image and the crosshairs always remain coincident.

[0165] Secure the measuring instrument in its adjusted position and orientation using clamps or locking devices to prevent movement. During the securing process, slowly tighten the clamps or locking devices while observing the autocollimation image and crosshairs in the theodolite eyepiece. If any misalignment is observed between the autocollimation image and the crosshairs, immediately stop securing the instrument and readjust its position and orientation. Ensure that the autocollimation image and crosshairs remain aligned after complete securing.

[0166] This process ensures that the optical axis of the measuring mirror remains aligned with the optical axis of the theodolite during the fixing process, avoiding errors introduced by the fixing operation.

[0167] Steps 1061-1062 ensure that the optical axis of the precision measuring instrument is strictly aligned with the optical axis of the theodolite through high-precision adjustment and real-time monitoring, providing a reliable reference for subsequent measurements.

[0168] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. This computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0169] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that comply with the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0170] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for calibrating the spin direction of a dispersive prism, characterized in that, The method includes: The dispersive prism, plane mirror, and theodolite, which have been fitted with a precision measuring mirror, are arranged according to the positional relationship of the measuring optical path; wherein the mirror surfaces of the dispersive prism and the plane mirror are placed perpendicularly in space, and the centers of the dispersive prism, the plane mirror, and the theodolite are on a straight line. Adjust the angles of the theodolite, the precision measuring mirror, and the plane mirror so that two autocollimated images returned by the precision measuring mirror and the plane mirror appear simultaneously in the field of view of the theodolite, and make the autocollimated image reflected by the plane mirror coincide with the crosshairs in the eyepiece of the theodolite. At this time, read the pitch angle scale on the theodolite to obtain the initial angle. Using the probe of a coordinate measuring machine, multiple points are collected on the rear surface, front surface, and front end face of the dispersive prism. The geometric shapes of the rear surface, front surface, and front end face of the dispersive prism are then fitted on a computer using these multiple points to obtain the first sphere, the second sphere, and the first plane, respectively. On the computer, the optical axes of the rear and front surfaces of the dispersive prism are fitted using the first sphere, the second sphere, and the first plane, and the second plane where the dispersive prism is located is also fitted; the second plane is the plane where the optical axis of the dispersive prism is located. Based on the initial angle, adjust the angles of the precision measuring mirror, the theodolite, and the plane mirror so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite, thereby ensuring that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches a preset accuracy. Fine-tune the position and orientation of the precision measuring mirror, and fix the precision measuring mirror when the optical axis of the precision measuring mirror is aligned with the optical axis of the theodolite; Multiple points are collected on the surface of the precision measuring mirror to fit a fourth plane on the computer; The target angle between the second plane and the fourth plane is measured, and the target angle is used as the final calibration value of the spin direction of the dispersive prism.

2. The method according to claim 1, characterized in that, The step of arranging the dispersive prism, plane mirror, and theodolite, which have been fitted with the precision measuring mirror, according to their positional relationship in the measurement optical path includes: The dispersive prism with the precision measuring mirror already installed is mounted on the base of the coordinate measuring machine using a support fixture; the plane mirror is mounted on the base using a lifting frame; The theodolite is mounted on a two-dimensional adjustment frame; the two-dimensional adjustment frame is located beside the base platform; The mirror surfaces of the dispersive prism and the plane mirror are placed vertically in space; The center of the dispersive prism, the center of the plane mirror, and the center of the theodolite are aligned in a straight line.

3. The method according to claim 1, characterized in that, Before mounting the dispersive prism with the precision measuring mirror already installed onto the base of the coordinate measuring machine using a support fixture, the process also includes: The precision measuring mirror is mounted on the side of the dispersive prism frame using a precision measuring mirror adapter. Install probes on the measuring head of the coordinate measuring machine and calibrate it.

4. The method according to claim 1, characterized in that, The step of fitting the optical axes of the rear and front surfaces of the dispersive prism using the first sphere, the second sphere, and the first plane on a computer, and fitting the second plane where the dispersive prism is located, includes: A first perpendicular line segment from the first sphere to the first plane and a second perpendicular line segment from the second sphere to the first plane are fitted on a computer; the first perpendicular line segment is the optical axis of the rear surface and the second perpendicular line segment is the optical axis of the front surface. The second plane is obtained by fitting the plane containing the first and second perpendicular segments.

5. The method according to claim 1, characterized in that, The step of adjusting the angles of the precision measuring mirror, the theodolite, and the plane mirror based on the initial angle, so that the autocollimated image returned by the plane mirror coincides with the crosshairs of the theodolite, ensures that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches a preset accuracy, including: The coordinate measuring machine is used to collect multiple points on the reflecting surface of the plane mirror, and the multiple points are used to fit a third plane; the third plane is the reflecting surface of the plane mirror. The angle between the second plane and the third plane is measured on the computer to obtain the second angle; The third angle that the precision measuring mirror needs to be adjusted is calculated based on the second angle, so that the second plane and the third plane are perpendicular; The pitch angle of the theodolite is adjusted to a fourth angle, which is the sum of the initial angle and the third angle; Adjust the angle of the plane mirror so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite; Multiple points on the reflecting surface of the plane mirror are collected again, and the third plane is fitted again using the multiple points. The angles of the precision measuring mirror, the theodolite, and the plane mirror are adjusted again so that the autocollimation image returned by the plane mirror coincides with the crosshairs of the theodolite. After multiple adjustments, when the third angle that the precision measuring mirror needs to be adjusted next is less than or equal to the preset angle, it is determined that the perpendicularity of the reflecting surface of the plane mirror to the optical axis plane of the dispersive prism reaches the preset accuracy.

6. The method according to claim 1, characterized in that, The fine-tuning of the position of the measuring mirror, ensuring that the optical axis of the measuring mirror is aligned with the optical axis of the theodolite, and then fixing the measuring mirror, includes: Adjust the position and orientation of the precision measuring mirror so that the autocollimated image reflected by the precision measuring mirror coincides with the crosshairs, thereby ensuring that the optical axis of the precision measuring mirror is aligned with the optical axis of the theodolite; Fix the precision measuring mirror, and during the process of fixing the precision measuring mirror, continuously monitor the alignment status of the autocollimation image in the theodolite with the crosshairs to ensure that the autocollimation image and the crosshairs always remain coincident.

7. A device for calibrating the spin direction of a dispersive prism, characterized in that, The device is used to implement the calibration method for the spin direction of the dispersive prism according to any one of claims 1-6. The device includes: a coordinate measuring machine, a dispersive prism assembly, a plane mirror, a lifting frame, an air-bearing platform, a theodolite, a two-dimensional adjustment frame, and supporting fixtures. The coordinate measuring machine can adjust the position of the probe mounted on it in the X, Y, and Z directions. The probe is used to collect the coordinates of points on the surface of the dispersive prism. The plane mirror is mounted on the lifting frame, the dispersive prism assembly is mounted on the support fixture, and the lifting frame and the support fixture are mounted on the base of the coordinate measuring machine; the coordinate measuring machine is mounted on the air-bearing platform; the theodolite is mounted on the two-dimensional adjustment frame. The lifting frame, the supporting fixture, and the two-dimensional adjustment frame are respectively used to fix and adjust the position and orientation of the plane mirror, the dispersive prism, and the theodolite; The dispersive prism assembly includes a dispersive prism and a precision measuring mirror. The dispersive prism is used to decompose the incident light into spectra of different wavelengths, and the precision measuring mirror is used to calibrate the output spectrum of the dispersive prism.

8. The apparatus according to claim 7, characterized in that, The coordinate measuring machine includes an X-axis translation component, a Y-axis translation component, a Z-axis lifting component, a probe, and a base. The Y-axis translation component is slidably connected to the base platform and is perpendicular to the base platform; the X-axis translation component is fixedly connected to the Y-axis translation component and is perpendicular to the Y-axis translation component; the Z-axis lifting component is slidably connected to the X-axis translation component and is perpendicular to the X-axis translation component. The probe is installed at the bottom of the Z-axis lifting assembly.

9. The apparatus according to claim 8, characterized in that, The dispersive prism assembly also includes a dispersive prism frame, a dispersive prism bonding ring, and a precision measuring mirror adapter. The dispersive prism frame is used to fix and support the dispersive prism by means of the dispersive prism bonding ring, and the precision measuring mirror is installed on the side of the dispersive prism frame by means of the precision measuring mirror adapter.

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