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 invention relates to the technical field of design of a self-calibrating wedge angle measuring device, in particular to a high-precision self-calibrating wedge angle measuring system. Background Art

[0002] At present, the wedge angle measuring instruments on the market are all point measurement, which has great measurement limitations, specifically, they cannot 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; and the existing wedge angle measuring instruments are limited in measurement speed, and additional calibration is required. The test results are closely related to the calibration accuracy, and there are large errors in the test results.

[0003] Existing wedge angle measurement instruments have some limitations and challenges, which need to be overcome by adopting new technologies and methods 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 problem that the wedge angle measuring instrument in the prior art has a large measurement error and requires additional calibration.

[0005] In order to solve the above technical problems, the present invention provides a self-calibration wedge angle measurement system, comprising a light source, a first CCD camera, a condenser, a beam splitter, a reflector, a convex lens, a sample to be measured and a host computer, wherein the host computer is connected to the first CCD camera; The light source is used to generate light, the condenser is used to enhance the light generated by the light source, one side of the beam splitter 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 and returns to the beam splitter, the two beams of light are reflected to the reflector through the other side of the beam splitter, the two beams of light passing through the reflector reach the first CCD camera via a convex lens and form two light spots, and the host computer calculates the wedge angle of the sample to be tested according to the distance between the two light spots.

[0006] In one embodiment of the present invention, a baffle is further included, wherein the baffle is disposed between the light source and the focusing sheet and is used to control the diameter of the light spot generated by the light source to be 1-4 mm.

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

[0008] In one embodiment of the present invention, a second CCD camera is further included, the second CCD camera is connected to the host computer, and the second CCD camera is arranged between the spectrometer and the sample to be tested; If the transmitted light generates two beams of light after passing through the wedge-shaped surface of the sample to be tested and cannot return to the spectrometer, the host computer controls the second CCD camera to shoot the two beams of light generated after the transmitted light passes through the wedge-shaped surface of the sample to be tested, and the host computer controls the assisting robot arm to adjust the inclination angle of the equipment 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 and reaches the spectrometer.

[0009] In one embodiment of the present invention, the assisting mechanical arm is provided with a communication unit, a single chip microcomputer, a motor driver and a motor connected in sequence; 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 assisting the robot arm to tilt at an angle.

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

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

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

[0013] In one embodiment of the present invention, The distance between the light source and the condenser is adjusted according to the radius of curvature of the condenser; The distance between the light concentrator and the light 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 curvature radius 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 solution of the present invention has the following advantages compared with the prior art: The self-calibration wedge angle measurement system of the present invention can accurately and effectively measure the wedge angle of an object (i.e., a sample to be measured) made of an angled transparent or semi-transparent material; The self-calibration wedge angle measurement system constructed by the present invention can automatically adjust the inclination angle of the assisting mechanical arm when measuring the wedge angle, realize internal self-calibration, and does not require additional measurement calibration, thereby ensuring the effectiveness of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

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

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

[0019] Reference Figure 1 and Figure 2 As shown, the present invention relates to a self-calibration wedge angle measurement system, comprising 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 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 focusing plate 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 8 to be tested and returns to the beam splitter 5, the two beams of light are reflected to the reflective plate 6 through the other side of the beam splitter 5, the two beams of light passing through the reflective plate 6 reach the first CCD camera 3 via the convex lens 9 and form two light spots, and the host computer 10 calculates the wedge angle of the sample 8 to be tested according to the distance between the two light spots.

[0020] It should be noted that the beam splitter 5 includes two surfaces, namely, a first surface (coated with an anti-reflection film) and a second surface (coated with a reflective film). The light beam from the condenser 4 directly generates transmitted light after reaching the first surface of the beam splitter 5 and reaches the sample 8 to be tested. The wedge-shaped surface of the sample 8 to be tested then generates two beams of light that return to the second surface 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 further and make them clearer.

[0022] See also Figure 3 The present embodiment further includes a baffle 11, which is disposed between the light source 2 and the condenser 4, and is used to control the diameter of the light spot generated by the light source to be 1-4 mm, preferably 2 mm. The baffle 11 is introduced in the present embodiment to allow for 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 4, the beam splitter 5, and the reflector 6 are integrated into a device body, and the device body is mounted on an assisting robotic arm 1, and 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 the present embodiment further includes a second CCD camera 7, which is connected to a host computer 10, and is disposed between the beam splitter 5 and the sample to be tested 8 (but cannot block the light path 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 robot 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.

[0025] For further information, see Figure 4 , the assisting robot arm 1 is provided with a communication unit 101, a single chip computer 102, a motor driver 103 and a motor 104 connected in sequence; 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 computer 102, and the single chip computer 102 controls the motor driver 103 to drive the motor 104 to rotate according to the received instructions, thereby realizing the tilting angle of the assisting robot arm 1. It should be noted that a communication module is also provided in the host computer 10, and the communication module is used to communicate with the communication unit 101 in the assisting robot arm 1, and the communication protocol can be based on the Bluetooth communication protocol, the WIFI communication protocol, etc.

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

[0027] Furthermore, 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.

[0028] Furthermore, the distance between the light source 2 and the condenser sheet 4 can be adjusted according to the curvature radius of the condenser sheet 4 (ie, the concave lens).

[0029] Furthermore, the distance between the light concentrating sheet 4 and the light splitting sheet 5 is 60-200 mm.

[0030] Furthermore, the distance between the reflective sheet 6 and the convex lens 9 is 60-200 mm.

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

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

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

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

[0035] Furthermore, the host computer 10 calculates the wedge angle of the sample 8 to be tested according to the distance between the two light spots, and specifically calculates the wedge angle by inferring 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 may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including 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 explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the 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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