Method and system for testing pitching or deflection linearity of adjusting frame
By deploying the camera clamping mechanism and laser light source on the optical adjustment rack, quantifying the pitch or swing linearity of the adjustment rack, the difficulty of linearity testing of the optical adjustment rack is solved, accurate quantization and crosstalk evaluation are achieved, and the positioning accuracy of the optical system is improved.
Patent Information
- Application Number
- CN202510509873.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-22
- Publication Date
- 2025-07-18
AI Technical Summary
There is a lack of effective testing methods in the prior art to quantify the linearity of the optical adjustment frame in pitch and swing dimensions, affecting the positioning accuracy of the optical element and system performance.
Using a test system including a camera clamping mechanism and a clamping light source, the laser spot center is aligned with the camera field of view, and the spot picture is synchronized, the vertical distance between the spot center and the fitted line is calculated, the linear floating index of the adjustment frame is quantified, and the quantization accuracy is optimized in combination with the linear polarizer.
The calibration accuracy of the optical adjustment frame is quantified. The test process is simple and practical, compatible with manual and automatic operation, and can scientifically evaluate linear floating and crosstalk, which is highly scalable.
Smart Images
Figure CN120333769A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of detection technology, and particularly to a method and system for testing the linearity of pitch or yaw adjustment of an adjustment bracket. Background Art
[0002] Optical adjustment brackets play a crucial role in modern optical systems. Their main function is to precisely adjust the position and attitude of optical elements to ensure that the performance of the optical system reaches the best state. With the continuous development of optical technology, the application fields of optical adjustment brackets are becoming increasingly extensive, including but not limited to optical instruments, semiconductor manufacturing, optical detection equipment, etc. In these applications, the linearity of the optical adjustment bracket in the pitch and yaw dimensions is a key performance indicator, which directly affects the positioning accuracy of optical elements and the overall performance of the system; however, there is currently no relevant testing technology. Summary of the Invention
[0003] The purpose of the present invention is to disclose a method and system for testing the linearity of pitch or yaw adjustment of an adjustment bracket to accurately quantify the adjustment accuracy of the adjustment bracket to be measured.
[0004] To achieve the above purpose, the method for testing the linearity of pitch or yaw adjustment of an adjustment bracket disclosed by the present invention includes:
[0005] Step S1, deploy a test system, where the test system includes a camera clamping mechanism and an adjustment bracket to be measured that clamps a light source and are arranged at intervals;
[0006] Step S2, align the center of the outgoing light spot of the laser light source with the center of the field of view in the camera;
[0007] Step S3, in the aligned test system, keep the spatial attitude of the camera clamping mechanism unchanged, perform a series of single-dimensional attitude adjustments on the adjustment bracket to be measured only in the pitch or yaw dimension, and during the series of attitude adjustments of greater than or equal to 3 times, synchronously collect the light spot pictures corresponding to each attitude with the camera;
[0008] Step S4, respectively extract the coordinate information of the light spot center from the series of light spot pictures, fit a straight line according to the series of coordinate information, then respectively calculate the perpendicular distance between each extracted light spot center and the fitted straight line, finally calculate the average value of the series of perpendicular distances, and use the average value as the linearity floating index when the adjustment bracket to be measured makes a single-dimensional attitude adjustment in pitch or yaw.
[0009] Preferably, the camera clamping mechanism includes a camera adjustment frame capable of adjusting both pitch and yaw. The bottom of the camera adjustment frame is fixed on the breadboard through a first connecting rod bracket with adjustable height. A camera adapter is arranged between the camera adjustment frame and the camera. A first diaphragm capable of adjusting the camera's field of view is provided at the end of the camera adapter between the camera and the measured adjustment frame.
[0010] Preferably, the bottom of the measured adjustment frame is fixed on the breadboard through a second connecting rod bracket with adjustable height. A first light source adapter is arranged between the measured adjustment frame and the laser light source. The laser light source is connected to a second diaphragm capable of adjusting the size of the outgoing light spot through a second light source adapter.
[0011] Preferably, a linear polarization component capable of adjusting the polarization direction is also arranged at the front end of the second adapter. The linear polarizer in the linear polarization component is located between the second diaphragm and the camera clamping mechanism.
[0012] Preferably, during the attitude adjustment of the same group, the direction of the linear polarizer is maintained unchanged; when at least two linear polarization directions are used to determine the linear floating index, first calculate the linear floating indexes corresponding to each linear polarization direction respectively, and then average the linear floating indexes of different linear polarization directions to obtain the final result of the linear floating index.
[0013] Preferably, it further includes:
[0014] When no linear polarizer is arranged between the camera clamping mechanism and the measured adjustment frame or in the same linear polarization direction, group the attitude adjustments in the pitch and yaw dimensions, then respectively extract the slopes of the fitted lines in the pitch and yaw directions, and calculate the included angle A between the two extracted slopes k1 and k2. Then, quantify the crosstalk amount between the pitch and yaw dimensions of the measured adjustment frame according to the included angle A; the crosstalk amount includes:
[0015] On the one hand, when the moving amount of the fitted line in the yaw attitude adjustment is 1, due to crosstalk, the passive moving amount of the fitted line in the pitch attitude adjustment is 1 / tan A;
[0016] On the other hand, when the moving amount of the fitted line in the yaw attitude adjustment is 1, due to crosstalk, the passive moving amount of the fitted line in the pitch attitude adjustment is also 1 / tan A;
[0017] Wherein,
[0018] To achieve the above object, the present invention also discloses a system for testing the linearity of the pitch or yaw adjustment of an adjustment frame, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it cooperates with manual operations to implement the above method.
[0019] The present invention has the following beneficial effects:
[0020] 1. The test system is simple, practical and convenient to deploy.
[0021] 2. During the test process, the attitude switching operation can be manually performed or automatically performed, with strong compatibility.
[0022] 3. The obtained linear floating index is scientific and reasonable, and the crosstalk relationship between pitch and yaw can be further calculated according to the slopes of the two fitted pitch and yaw lines, with strong scalability.
[0023] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:
[0025] Figure 1 is a schematic flow chart of a method for adjusting the pitch or yaw linearity of a test adjustment frame disclosed in an embodiment of the present invention.
[0026] Figure 2 is a deployment structure diagram of a test system disclosed in an embodiment of the present invention.
[0027] Figure 3 is a schematic diagram of the relationship of passive crosstalk formed by yaw during the pitch adjustment disclosed in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] The following will describe in detail the embodiments of the present invention with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.
[0029] Embodiment 1
[0030] This embodiment discloses a method for adjusting the pitch or yaw linearity of a test adjustment frame, as Figure 1 shown, including:
[0031] Step S1, deploying a test system, the test system includes a camera clamping mechanism and a measured adjustment frame clamping a light source that are arranged at intervals.
[0032] In this step, the test system is preferably deployed in a darkroom environment. Refer to Figure 2, the test system of this embodiment may include: 1. Breadboard; 2. Adjustable connecting rod bracket; 3. Camera; 4. Camera adjustment bracket; 5. Camera adapter; 6. Adjustable aperture (including the first aperture for adjusting the camera field of view and the second aperture for adjusting the size of the outgoing light spot); 7. Adjustable polarizer; 8. Light source adapter; 9. Laser light source; 10. Test adjustment bracket to be measured. Among them, the bottom of the adjustable connecting rod bracket 2 is fixed on the breadboard 1 by screws, and at the same time, the top is connected to the camera adjustment bracket 4 and the test adjustment bracket 10 to be measured. The camera adapter 5 is fixed on the camera adjustment bracket 4, and at the same time, the camera 3 and the first aperture are fixed on the camera adjustment bracket 4 through the adapter 5. Correspondingly, the laser light source 9 is fixed on the test adjustment bracket 10 to be measured through the light source adapter 8, and at the same time, the second aperture and the adjustable polarizer 7 are connected through the light source adapter 8.
[0033] Step S2: Align the center of the outgoing light spot of the laser light source with the center of the field of view in the camera.
[0034] In this step, based on Figure 2 the test system shown, the specific alignment operation process can be as follows:
[0035] Step S21: First, adjust the heights of the test adjustment bracket to be measured and the camera adjustment bracket so that the laser can enter the camera. Then open the camera software, adjust the exposure value and turn on the cross in the center of the camera field of view. Adjust the height and angle of the connecting rod so that the laser light source can be captured by the camera. At this time, increase the first aperture and decrease the second aperture, and adjust the pitch and yaw of the test adjustment bracket to be measured to move the light spot in the camera to the center position of the cross.
[0036] After completing the above actions, increase the second aperture and decrease the first aperture. It can be clearly seen that when the first aperture is decreased, the light entering the camera becomes less, and the outer circle formed by the second aperture can be seen. At this time, adjust the camera adjustment bracket so that the outer circle of the first aperture is approximately centered (refer to the cross).
[0037] Step S23: Then adjust the first aperture to the maximum, and then appropriately adjust the second aperture and the polarizer. Finally, a circular bright spot can be seen on the light spot image acquisition software.
[0038] In this embodiment, the polarizer usually uses a linear polarizer, and its function is to screen the polarization direction. Usually, the beam emitted by the laser light source is polarized light. Therefore, changing the polarization direction usually affects the intensity of the light. In this embodiment, the subsequent calculated linearity floating index or the crosstalk index between pitch and yaw usually has no causal relationship with the light intensity. However, subsequent secondary verification can be performed by changing the polarization direction. And when there are differences in the data, taking the average of the calculation results of different groups corresponding to different polarization directions can further improve the quantization accuracy.
[0039] Step S3: In the aligned test system, keep the spatial attitude of the camera clamping mechanism unchanged, and perform a series of single-dimensional attitude adjustments on the test adjustment frame to be measured only in the pitch or yaw dimension. During the series of attitude adjustments of 3 times or more, synchronously collect the spot images corresponding to each attitude with the camera.
[0040] In this step, rotate the pitch or yaw of the test adjustment frame to be measured, and capture one image after each rotation. At least 10 or more spot images need to be captured for the test in a single dimension.
[0041] Step S4: Respectively extract the coordinate information of the spot centers from the series of spot images, fit a straight line according to the series of coordinate information, then respectively calculate the perpendicular distances between the extracted spot centers and the fitted straight line, and finally calculate the average value of the series of perpendicular distances, and use the average value as the linearity floating index when the test adjustment frame to be measured undergoes a single-dimensional attitude adjustment in the pitch or yaw dimension.
[0042] In this step, the fitting of the straight line can adopt the least squares method, which is an existing technology well-known to those skilled in the art and will not be elaborated here.
[0043] Preferably, if based on Figure 1 the shown test system, during the same group of attitude adjustments, keep the direction of the linear polarizer unchanged; when using at least two linear polarization directions to determine the linearity floating index, first calculate the linearity floating indices corresponding to each linear polarization direction respectively, and then take the average of the linearity floating indices in different linear polarization directions to obtain the final result of the linearity floating index.
[0044] Optionally, as a deteriorated implementation, Figure 1 the linear polarizer in
[0045] In Figure 1 , the pitch and yaw of the camera adjustment frame and the test adjustment frame to be measured are both adjusted by a screw pair structure. Theoretically, if there is no crosstalk between the two dimensions, the included angle of the straight line fitted based on the above steps is a right angle. However, in actual products, there is more or less crosstalk between the two dimensions. Therefore, further, when there is no linear polarizer deployed between the camera clamping mechanism and the test adjustment frame to be measured or in the same linear polarization direction, group the attitude adjustments in the pitch and yaw dimensions (that is, the series of attitude adjustments in the pitch dimension are in one group, and the series of attitude adjustments in the yaw dimension are in another group), then respectively extract the slopes of the straight lines fitted in the pitch and yaw directions, and calculate the included angle A between the two extracted slopes k1 and k2, where, Then quantify the crosstalk amount between the pitch and yaw dimensions of the test adjustment frame to be measured according to the included angle A; the crosstalk amount includes the following two aspects:
[0046] On the one hand, when the moving amount of the fitted straight line for yaw attitude adjustment is 1, due to crosstalk, the passive moving amount of the fitted straight line for pitch attitude adjustment is 1 / tan A.
[0047] On the other hand, when the moving amount of the fitted straight line for yaw attitude adjustment is 1, due to crosstalk, the passive moving amount of the fitted straight line for pitch attitude adjustment is also 1 / tan A.
[0048] The principle of the above crosstalk can be referred to Figure 3 the two-dimensional relationship shown in the figure. Wherein, OA is the direction of the fitted straight line during the pitch single-dimensional test, OB is the direction of the fitted straight line during the yaw single-dimensional debugging, and ∠AOB is the included angle calculated by the slope and is denoted as A. When adjusting the yaw, the adjustment frame actually moves along OC (perpendicular to OA). Assuming the moving amount is OD, and from trigonometric functions, ∠AOB = ∠ODE. Decomposing OD into the world coordinate system, the actual moving amounts are OE and ED. When the moving amount of OE is 1, there will be a passive crosstalk of the size of ED in the pitch direction, and the value of the moving amount of the passive crosstalk of ED is specifically 1 / tan A. Similarly, when adjusting the yaw, there is also a crosstalk of 1 / tan A in the yaw direction.
[0049] Embodiment 2
[0050] Corresponding to the above embodiment, this embodiment discloses a system for testing the linearity of the adjustment of the pitch or yaw of an adjustment frame, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it cooperates with manual operations to implement the above method.
[0051] In summary, the method and system disclosed in the embodiments of the present invention have at least the following beneficial effects:
[0052] 1. The test system is simple and practical, and the deployment is convenient.
[0053] 2. During the test process, the attitude switching operation can be manually performed or automatically performed, and the compatibility is strong.
[0054] 3. The obtained linear floating index is scientific and reasonable, and the crosstalk relationship between pitch and yaw can be further calculated according to the slopes of the two fitted straight lines of pitch and yaw, and the expandability is strong.
[0055] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A method for testing the linearity of pitch or yaw adjustment of an adjustment bracket, characterized in that, Including: Step S1: Deploy a test system, where the test system includes a camera clamping mechanism and a tested adjusting bracket for clamping a light source, which are arranged at intervals; Step S2: Align the center of the outgoing light spot of the laser light source with the center of the field of view in the camera; Step S3: In the aligned test system, keep the spatial attitude of the camera clamping mechanism unchanged, and perform a series of single-dimensional attitude adjustments on the tested adjusting bracket only in the pitch or yaw dimension. During the series of attitude adjustments of 3 times or more, synchronously collect the light spot pictures corresponding to each attitude with the camera; Step S4: Respectively extract the coordinate information of the light spot center from the series of light spot pictures, fit a straight line according to the series of coordinate information, then respectively calculate the perpendicular distance between each extracted light spot center and the fitted straight line, finally calculate the average value of the series of perpendicular distances, and use the average value as the linearity floating index when the tested adjusting bracket undergoes pitch or yaw single-dimensional attitude adjustment.
2. The method for adjusting the pitch or yaw linearity of the test adjustment frame according to claim 1, characterized in that The camera clamping mechanism includes a camera adjusting bracket that can be adjusted in both pitch and yaw. The bottom of the camera adjusting bracket is fixed on a breadboard through a first connecting rod bracket with adjustable height. A camera adapter is arranged between the camera adjusting bracket and the camera. A first diaphragm for adjusting the camera field of view is provided at the end of the camera adapter between the camera and the tested adjusting bracket.
3. The method for adjusting the pitch or yaw linearity of the test adjustment frame according to claim 1, characterized in that The bottom of the tested adjusting bracket is fixed on a breadboard through a second connecting rod bracket with adjustable height. A first light source adapter is arranged between the tested adjusting bracket and the laser light source. The laser light source is connected to a second diaphragm for adjusting the size of the outgoing light spot through a second light source adapter.
4. The method for adjusting the pitch or yaw linearity of the test adjustment frame according to claim 3, characterized in that, A linear polarization component for adjusting the polarization direction is also deployed at the front end of the second adapter. The linear polarizer in the linear polarization component is located between the second diaphragm and the camera clamping mechanism.
5. The method for adjusting the pitch or yaw linearity of the test adjusting frame according to claim 4, characterized in that During the same set of attitude adjustments, keep the direction of the linear polarizer unchanged; when using at least two linear polarization directions to determine the linearity floating index, first calculate the linearity floating index corresponding to each linear polarization direction, and then take the average of the linearity floating indexes in different linear polarization directions to obtain the final result of the linearity floating index.
6. The method for adjusting the pitch or yaw linearity of the test adjustment frame according to claim 5, characterized in that, Also including: In the same linear polarization direction, perform attitude adjustments in the pitch and yaw dimensions in groups, then respectively extract the slopes of the fitted straight lines in the pitch and yaw directions, calculate the included angle A between the two extracted slopes k1 and k2, and then quantify the crosstalk amount between the pitch and yaw dimensions of the tested adjusting bracket according to the included angle A; The crosstalk amount includes: On the one hand, when the moving amount of the fitted straight line in the yaw attitude adjustment is 1, the moving amount of the fitted straight line in the pitch attitude adjustment due to crosstalk is 1 / tan A; On the other hand, when the moving amount of the fitted straight line in the yaw attitude adjustment is 1, the moving amount of the fitted straight line in the pitch attitude adjustment due to crosstalk is also 1 / tan A; Among them, 7. The method for adjusting the pitch or yaw linearity of the test adjusting frame according to claim 1, 2 or 3, characterized in that Also including: When no linear polarizer is deployed between the camera clamping mechanism and the adjustable frame under test, the attitude adjustment in the pitch and yaw dimensions is carried out in groups, and then the slopes of the fitted straight lines in the pitch and yaw directions are extracted respectively, and the included angle A between the two extracted slopes k1 and k2 is calculated. Then, according to the included angle A, the crosstalk amount between the adjustable frame under test in the pitch and yaw dimensions is quantified; the crosstalk amount includes: On the one hand, when the moving amount of the fitted straight line in the yaw attitude adjustment is 1, the moving amount of the fitted straight line in the pitch attitude adjustment due to crosstalk is 1 / tan A passively; On the other hand, when the moving amount of the fitted straight line in the yaw attitude adjustment is 1, the moving amount of the fitted straight line in the pitch attitude adjustment due to crosstalk is also 1 / tan A passively; Among them, 8. A system for testing the pitch or yaw linearity of an adjustment bracket, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it cooperates with manual operations to implement the method according to any one of claims 1 to 7 above.