High-precision self-calibration wedge angle measurement system

Abstract

The invention relates to a high-precision self-calibration wedge angle measuring system which comprises a light source, a first CCD camera, a light condensing sheet, a light splitting sheet, a reflecting sheet, a convex lens, a sample to be measured and an upper computer, and the upper computer is connected with the first CCD camera. The self-calibration wedge angle measurement system constructed by the invention can be used for accurately and effectively measuring the wedge angle of an object (namely a sample to be measured) made of a transparent or semitransparent material with an angle; when the wedge angle is measured, communication can be provided for the assisting mechanical arm, the inclination angle of the assisting mechanical arm is automatically adjusted, internal self-calibration is achieved, extra measurement calibration is not needed, and the measurement effectiveness is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of self - calibration wedge angle measuring device design, and particularly to a high - precision self - calibration wedge angle measuring system. Background Art

[0002] Currently, the wedge angle measuring instruments on the market are all point - measurement types, with relatively large measurement limitations, specifically manifested in the inability to provide the angle distribution of the entire area. This limitation leads to the possibility that the measurement results may not be comprehensive and cannot reflect the true situation of the entire wedge surface; moreover, the measurement speed of existing wedge angle measuring instruments is limited, and additional calibration is required. The test results are closely related to the calibration accuracy, and there are relatively large errors in the test results.

[0003] Existing wedge angle measuring instruments have some limitations and challenges, and new technologies and methods need to be adopted to overcome these problems in order to improve the efficiency and accuracy of measurement. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems of relatively large measurement errors in existing wedge angle measuring instruments and the need for additional calibration.

[0005] To solve the above - mentioned technical problems, the present invention provides a self - calibration wedge angle measuring system, including a light source, a first CCD camera, a condenser lens, a beam splitter, a reflector, a convex lens, a sample to be measured, and a host computer. Among them, the host computer is connected to the first CCD camera; The light source is used to generate light, the condenser lens is used to enhance the light generated by the light source, one side of the beam splitter is used to transmit the light - enhanced light to obtain transmitted light, the transmitted light generates two beams of light after passing through the wedge surface of the sample to be measured and returns to the beam splitter, the two beams of light are reflected by the other side of the beam splitter to the reflector, and the two beams of light passing through the reflector reach the first CCD camera via the convex lens and form two light spots. The host computer calculates the wedge angle of the sample to be measured according to the distance between the two light spots.

[0006] In an embodiment of the present invention, a baffle is further included. The baffle is arranged between the light source and the condenser lens and is used to control the spot diameter of the light generated by the light source within 1 - 4 mm.

[0007] In an embodiment of the present invention, the light source, the first CCD camera, the condenser lens, the beam splitter, and the reflector are integrated into a device body. The device body is installed on an assisting robotic arm, the assisting robotic arm is connected to the host computer, and the assisting robotic arm is used to adjust the tilt angle of the device body according to the instructions of the host computer.

[0008] In one embodiment of the present invention, it further includes a second CCD camera, which is connected to the host computer and is arranged between the beam splitter and the sample to be measured; If two beams of light cannot return to the beam splitter after the transmitted light passes through the wedge surface of the sample to be measured, the host computer controls the second CCD camera to capture the two beams of light generated after the transmitted light passes through the wedge surface of the sample to be measured, and the host computer controls the assisting robotic arm to adjust the tilt angle of the device body according to the captured light data, so that the two beams of light generated after the transmitted light passes through the wedge surface of the sample to be measured reach the beam splitter.

[0009] In one embodiment of the present invention, a communication unit, a single-chip microcomputer, a motor driver, and a motor are sequentially connected inside the assisting robotic arm; The communication unit is connected to the host computer, receives instructions from the host computer and sends them to the single-chip microcomputer. The single-chip microcomputer controls the motor driver to drive the motor to rotate according to the received instructions, thereby realizing the tilting of the assisting robotic arm.

[0010] In one embodiment of the present invention, the single-chip microcomputer is an STM32 series single-chip microcomputer; The communication unit is any one of a communication unit based on 4G / 5G, a communication unit based on Bluetooth, and a communication unit based on WIFI.

[0011] In one embodiment of the present invention, the visible light anti-reflection range of the convex lens is 400 - 700 nm.

[0012] In one embodiment of the present invention, the condenser lens is a concave lens, and the visible light anti-reflection range of the concave lens is 400 - 700 nm.

[0013] In one embodiment of the present invention, The distance between the light source and the condenser lens is adjusted according to the radius of curvature of the condenser lens; The distance between the condenser lens and the beam splitter is 60 - 200 mm; The distance between the reflector and the convex lens is 60 - 200 mm; The distance between the convex lens and the first CCD camera is adjusted according to the radius of curvature of the convex lens.

[0014] In one embodiment of the present invention, the transmittance of the beam splitter is 50%, and the reflectivity is 50%.

[0015] The above technical solutions of the present invention have the following advantages compared with the prior art: The self-calibrating wedge angle measurement system of the present invention can accurately and effectively measure the wedge angle of an object (i.e., the sample to be measured) made of a transparent or semi-transparent material with an angle; The self-calibrating wedge angle measurement system constructed by the present invention can automatically adjust the tilt angle of the assisting robotic arm when measuring the wedge angle, realizing internal self-calibration, without the need for additional measurement calibration, and ensuring the effectiveness of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the content of the present invention easier to be clearly understood, the present invention will be further described in detail below according to the specific embodiments of the present invention in conjunction with the drawings.

[0017] Figure 1 is a schematic structural diagram of the self-calibrating wedge angle measurement system in the embodiment of the present invention; Figure 2 is a schematic diagram of the connection between the upper computer and other components in the embodiment of the present invention; Figure 3 is a schematic diagram of the position of the baffle in the embodiment of the present invention; Figure 4 is a schematic diagram of the internal frame of the assisting robotic arm in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present invention will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited are not intended to limit the present invention. Embodiment 1

[0019] Referring to Figure 1 and Figure 2 shown, the present invention relates to a self-calibrating wedge angle measurement system, including a light source 2, a first CCD camera 3, a condenser 4, a beam splitter 5, a reflector 6, a convex lens 9, a sample to be measured 8, and an upper computer 10. Among them, the upper computer 10 is connected to the first CCD camera 3; The light source 2 is used to generate light. The condenser 4 is used to enhance the light generated by the light source 2. One side of the beam splitter 5 is used to transmit the light-enhanced light to obtain transmitted light. The transmitted light generates two beams of light after passing through the wedge surface of the sample to be measured 8 and returns to the beam splitter 5. The two beams of light pass through the other side of the beam splitter 5 and are reflected to the reflector 6. The two beams of light passing through the reflector 6 reach the first CCD camera 3 via the convex lens 9 and form two light spots. The upper computer 10 calculates the wedge angle of the sample to be measured 8 according to the distance between the two light spots.

[0020] It should be noted that the beam splitter 5 includes two sides, namely the first side (coated with an anti-reflection film) and the second side (coated with a reflection film). The light beam from the condenser 4 directly generates transmitted light and reaches the sample to be measured 8 after reaching the first side of the beam splitter 5. Two beams of light generated after passing through the wedge surface of the sample to be measured 8 return to the second side of the beam splitter 5 and directly generate reflected light to reach the reflector 6.

[0021] In this embodiment, the function of the reflector 6 is to separate the two beams of light more widely and clearly.

[0022] Please refer to Figure 3 , this embodiment further includes a baffle 11. The baffle 11 is arranged between the light source 2 and the condenser lens 4 and is used to control the diameter of the light spot generated by the light source within 1 - 4 mm, preferably 2 mm. The reason for introducing the baffle 11 in this embodiment is that the baffle 11 aims to allow more types of light sources 2, including but not limited to point light sources.

[0023] Furthermore, the light source 2, the first CCD camera 3, the condenser lens 4, the beam splitter 5, and the reflector 6 are integrated into a device body. The device body is installed on the assisting robotic arm 1. The assisting robotic arm 1 is connected to the host computer 10, and the assisting robotic arm 1 is used to adjust the tilt angle of the device body according to the instructions of the host computer 10.

[0024] It is worth mentioning that this embodiment further includes a second CCD camera 7. The second CCD camera 7 is connected to the host computer 10 and is arranged between the beam splitter 5 and the sample to be measured 8 (but does not block the light path between the beam splitter 5 and the sample to be measured 8); if the transmitted light generates two beams of light after passing through the wedge surface of the sample to be measured 8 and cannot return to the beam splitter 5, then the host computer 10 controls the second CCD camera 7 to capture the two beams of light generated after the transmitted light passes through the wedge surface of the sample to be measured 8, and the host computer 10 controls the assisting robotic arm 1 to adjust the tilt angle of the device body according to the captured light data, so that the two beams of light generated after the transmitted light passes through the wedge surface of the sample to be measured 8 reach the beam splitter 5.

[0025] Furthermore, please refer to Figure 4 , a communication unit 101, a single-chip microcomputer 102, a motor driver 103, and a motor 104 are sequentially connected in the assisting robotic arm 1; the communication unit 101 is connected to the host computer 10, receives instructions from the host computer 10 and sends them to the single-chip microcomputer 102. The single-chip microcomputer 102 controls the motor driver 103 to drive the motor 104 to rotate according to the received instructions, thereby realizing the tilting of the assisting robotic arm 1. It should be noted that a communication module is also provided in the host computer 10, and this communication module is used to communicate with the communication unit 101 in the assisting robotic arm 1. The communication protocol can be based on the Bluetooth communication protocol, the WIFI communication protocol, etc.

[0026] Furthermore, the single-chip microcomputer 102 is an STM32 series single-chip microcomputer.

[0027] Furthermore, the communication unit 101 is any one of a communication unit based on 4G / 5G, a communication unit based on Bluetooth, and a communication unit based on WIFI.

[0028] Further, the distance between the light source 2 and the condenser lens 4: The distance between the light source 2 and the condenser lens 4 can be adjusted according to the radius of curvature of the condenser lens 4 (i.e., the concave lens).

[0029] Further, the distance between the condenser lens 4 and the beam splitter 5 is 60 - 200 mm.

[0030] Further, the distance between the reflector 6 and the convex lens 9 is 60 - 200 mm.

[0031] Further, the distance between the convex lens 9 and the first CCD camera 3: The distance between the convex lens 9 and the first CCD camera 3 can be adjusted according to the radius of curvature of the convex lens 9.

[0032] Further, the parameters of the convex lens 9 are: the visible light antireflection range is 400 - 700 nm, and the material is K9 glass.

[0033] Further, the condenser lens 4 is a concave lens, and the parameters of the concave lens are: the visible light antireflection range is 400 - 700 nm, and the material is K9 glass.

[0034] Further, the transmittance of the beam splitter 5 is 50%, and the reflectivity is 50%.

[0035] Further, the host computer 10 calculates the wedge angle of the sample 8 to be measured according to the distance between the two light spots, specifically by inferring the wedge angle from the distance between the pixels of the two light spots.

[0036] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0037] Obviously, the above embodiments are merely examples for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to exhaustively list all implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A high-precision self-calibration wedge angle measurement system, characterized in that: It comprises a light source (2), a first CCD camera (3), a condenser (4), a beam splitter (5), a reflector (6), a convex lens (9), a sample to be tested (8) and a host computer (10), wherein the host computer (10) is connected to the first CCD camera (3); The light source (2) is used to generate light, the condenser (4) is used to enhance the light generated by the light source (2), one side of the beam splitter (5) is used to transmit the enhanced light to obtain transmitted light, the transmitted light generates two beams of light after passing through the wedge-shaped surface of the sample to be tested (8) and returns to the beam splitter (5), the two beams of light are reflected to the reflector (6) through the other side of the beam splitter (5), the two beams of light passing through the reflector (6) reach the first CCD camera (3) via a convex lens (9) and form two light spots, and the host computer (10) calculates the wedge angle of the sample to be tested (8) according to the distance between the two light spots.

2. The high-precision self-calibration wedge angle measurement system according to claim 1, characterized in that: It also comprises a baffle (11), which is arranged between the light source (2) and the condenser sheet (4) and is used to control the diameter of the light spot generated by the light source to be 1-4 mm.

3. The high-precision self-calibration wedge angle measurement system according to claim 1, characterized in that: The light source (2), the first CCD camera (3), the condenser (4), the beam splitter (5), and the reflector (6) are integrated into a device body. The device body is mounted on an assisting mechanical arm (1). The assisting mechanical arm (1) is connected to a host computer (10). The assisting mechanical arm (1) is used to adjust the tilt angle of the device body according to instructions from the host computer (10).

4. The high-precision self-calibration wedge angle measurement system according to claim 3, characterized in that: It also includes a second CCD camera (7), the second CCD camera (7) is connected to the host computer (10), and the second CCD camera (7) is arranged between the beam splitter (5) and the sample to be tested (8); If the transmitted light generates two beams of light after passing through the wedge-shaped surface of the sample to be tested (8) and cannot return to the beam splitter (5), the host computer (10) controls the second CCD camera (7) to photograph the two beams of light generated after the transmitted light passes through the wedge-shaped surface of the sample to be tested (8), and the host computer (10) controls the assisting mechanical arm (1) to adjust the tilt angle of the device body according to the photographed light data, so that the transmitted light generates two beams of light after passing through the wedge-shaped surface of the sample to be tested (8) and reaches the beam splitter (5).

5. The high-precision self-calibration wedge angle measurement system according to claim 1, characterized in that: The assisting mechanical arm (1) is provided with a communication unit (101), a single-chip computer (102), a motor driver (103), and a motor (104) which are connected in sequence; The communication unit (101) is connected to a host computer (10), receives instructions from the host computer (10) and sends them to a single-chip computer (102); the single-chip computer (102) controls a motor driver (103) to drive a motor (104) to rotate according to the received instructions, thereby assisting the robot arm (1) in tilting an angle.

6. The high-precision self-calibration wedge angle measurement system according to claim 6, characterized in that: The single chip microcomputer (102) is a single chip microcomputer of the STM32 series; The communication unit (101) is any one of a 4G / 5G-based communication unit, a Bluetooth-based communication unit, and a WIFI-based communication unit.

7. The high-precision self-calibration wedge angle measurement system according to claim 1, characterized in that: The visible light transmittance enhancement range of the convex lens (9) is 400-700 nm.

8. The high-precision self-calibration wedge angle measurement system according to claim 1, characterized in that: The light focusing sheet (4) is a concave lens, and the visible light transmittance enhancement range of the concave lens is 400-700nm.

9. The high-precision self-calibration wedge angle measurement system according to claim 8, characterized in that: The distance between the light source (2) and the light collecting sheet (4) is adjusted according to the radius of curvature of the light collecting sheet (4); The distance between the light concentrator (4) and the light splitter (5) is 60-200 mm; The distance between the reflective sheet (6) and the convex lens (9) is 60-200 mm; The distance between the convex lens (9) and the first CCD camera (3) is adjusted according to the curvature radius of the convex lens (9).

10. The high-precision self-calibration wedge angle measurement system according to claim 1, characterized in that: The transmittance of the beam splitter (5) is 50%, and the reflectivity is 50%.

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