Glass optical thickness gauge

Abstract

The utility model relates to the technical field of glass detection, in particular to a glass optical thickness gauge which comprises a thickness measuring table, a light shield, a laser transmitter, a receiving assembly, a rotary clamping assembly and a polarized light filtering assembly, the light shield is fixedly connected to the top of the thickness measuring table, and the laser transmitter is installed on the inner side of the top of the light shield; the polarized light filtering assembly is installed on the outer surface of the rotary clamping assembly. According to the glass optical thickness gauge, the stepping motor of the rotary clamping assembly is matched with the accurate grinding plate with the shaft to accurately control the inclination angle of the glass, so that a laser beam is incident at a controllable oblique incidence angle, in a clamping state, the polaroid and the quartz depolarizer are tightly attached to the glass through the butt joint frame, the polaroid filters stray light in a non-target polarization direction, and the thickness of the glass is measured. The quartz depolarizer disrupts residual polarization noise, ensures that the photoelectric detector only responds to a light intensity signal, and inhibits interference light spots generated by multiple reflections in the glass, thereby reducing light energy loss.

Description

Technical Field

[0001] This application relates to the field of glass inspection technology, and in particular to a glass optical thickness gauge. Background Technology

[0002] An optical glass thickness gauge is a non-contact measuring device that primarily measures the thickness of glass through optical principles. It combines a sophisticated optical system with signal processing technology, utilizing the interference phenomenon of white light or low-coherence light. When light strikes the glass surface, it is reflected at both the front and back surfaces, forming two light paths.

[0003] A search revealed that publication number CN208872255U discloses a laser glass thickness gauge. When a laser emitter irradiates the surface of the glass to be measured and projects the laser onto a sensor, the CCD image sensor detects the laser and generates a sensing signal. This signal is then transmitted to a processor, which converts the received signal into test data and displays it on a screen, thus completing the measurement of the glass thickness. To improve the stability of the laser glass thickness gauge during operation and reduce inaccuracies due to operator error, a fixing device is installed on the side of the machine body facing the glass surface. This device secures the laser glass thickness gauge to the surface of the glass before measurement, ensuring that the laser emitter and the glass remain stationary at all times.

[0004] Regarding the aforementioned technologies, the inventors believe that the following technical defects exist and need to be improved: the incident angle of the aforementioned device is perpendicular to the glass. However, the triangulation method requires the laser beam to be incident on the material surface at a certain non-perpendicular angle, and the reflected light is captured by the position-sensitive detector. Perpendicular measurement will reduce accuracy. In addition, the aforementioned device does not add a relevant filter structure, which makes it impossible for the glass to filter out impurities and polarized light outside the light spot during the detection process, resulting in distorted detection data. Utility Model Content

[0005] This application provides a glass optical thickness gauge to improve the following technical problems: the incident angle of the above device is perpendicular to the glass. However, the triangulation method requires the laser beam to be incident on the material surface at a certain non-perpendicular angle. The reflected light is captured by the position-sensitive detector. Perpendicular measurement will reduce the accuracy. In addition, the above device does not add a related filter structure, so the glass cannot filter the impurity polarized light outside the light spot during the detection process, resulting in the distortion of the detection data.

[0006] This application provides a glass optical thickness gauge, which adopts the following technical solution:

[0007] An optical thickness gauge for glass includes a thickness measuring stage, a light shield, a laser emitter, a receiving component, a rotating clamping component, and a polarizing light filtering component. The light shield is fixedly connected to the top of the thickness measuring stage, the laser emitter is installed on the inner side of the top of the light shield, the receiving component is movably connected to the bottom of the thickness measuring stage, the rotating clamping component is installed in the middle of the thickness measuring stage, and the polarizing light filtering component is installed on the outer surface of the rotating clamping component.

[0008] The light shield is used to house the laser emitter and block external light sources. The laser emitter is used to emit short-pulse lasers onto the glass. The rotating clamping assembly is used to clamp the glass and eliminate reflected light from the front surface by rotating the glass, retaining only the transmitted main signal. The polarization filter assembly is used to filter impurity polarized light outside the light spot in the synchronous cooperation of the rotating clamping assembly.

[0009] In one feasible technical solution of this application, the rotary clamping assembly includes a hollow cover, a DC motor, a connecting shaft, a positioning frame, a stepper motor, a precision grinding plate with a shaft, and a docking frame. The hollow cover is fixedly connected to the surface of the thickness measuring stage. The DC motor is installed inside the hollow cover. The connecting shaft is installed outside the output end of the DC motor. One side of the positioning frame is fixedly connected to one end of the connecting shaft. The stepper motor is installed inside the positioning frame. The outer side of the shaft end of the precision grinding plate with a shaft is fixedly connected to the output end of the stepper motor. The surface of the docking frame is in contact with the precision-ground surface of the precision grinding plate with a shaft, and the surface of the docking frame clamps the glass.

[0010] In one feasible technical solution of this application, the polarization filter assembly includes a support frame, a light guide plate, a polarizer, and a quartz depolarizer. The support frame is fixedly connected to the outside of the docking frame, the light guide plate is installed on the inside of the support frame, the polarizer is snapped into the middle of the light guide plate, and the quartz depolarizer is installed below the polarizer.

[0011] In one feasible technical solution of this application, the receiving component includes a linear motor, an adjustment plate, and a photodetector. The linear motor is installed on the bottom inner side of the thickness measuring platform, the adjustment plate is installed above the moving end of the linear motor, and the photodetector is installed on the top of the adjustment plate.

[0012] In one feasible technical solution of this application, a telescopic rod and a compression spring are further provided at the connection between the shafted precision grinding plate and the positioning frame. The two sides of the compression spring are fixedly connected to the surfaces of the docking frame and the positioning frame, respectively, and the telescopic rod is installed on the inner side of the compression spring.

[0013] In one feasible technical solution of this application, the polarizer and the quartz depolarizer are symmetrically distributed on the outer side of the shafted fine grinding plate through the docking frame, and the light plates of the polarizer and the quartz depolarizer are in contact with the surface of the glass.

[0014] In summary, this application includes at least one of the following beneficial technical effects:

[0015] This device precisely controls the glass tilt angle using a stepper motor in conjunction with a shaft-mounted precision grinding plate, ensuring the laser beam is incident at a controllable oblique angle to meet the geometric requirements of triangulation. In the clamped state, the polarizer and quartz depolarizer are tightly fitted to the glass via a mating frame. The polarizer filters stray light from non-target polarization directions, and the quartz depolarizer disrupts residual polarization noise, ensuring the photodetector responds only to the light intensity signal and suppressing interference spots caused by multiple reflections within the glass, thus reducing light energy loss. Furthermore, a linear motor drives the photodetector to achieve real-time tracking of the light spot position, enabling the device to automatically compensate for spot shifts caused by glass rotation without manual intervention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the glass optical thickness gauge according to an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the internal structure of the light shield in an embodiment of this application.

[0019] Figure 3 This is an exploded view of the receiving component in an embodiment of this application.

[0020] Figure 4 This is a rotational effect diagram of the polarization filtering component in the embodiments of this application.

[0021] Figure 5 This is a schematic diagram of the structure of the rotating clamping assembly in the embodiments of this application.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Thickness measuring platform; 2. Light shield; 3. Laser emitter;

[0024] 4. Receiving component; 41. Linear motor; 42. Adjustment plate; 43. Photodetector;

[0025] 5. Rotary clamping assembly; 51. Hollow cover; 52. DC motor; 53. Connecting shaft; 54. Positioning frame; 55. Stepper motor; 56. Precision grinding plate with shaft; 57. Docking frame;

[0026] 6. Polarizing filter assembly; 61. Support frame; 62. Light guide plate; 63. Polarizer; 64. Quartz depolarizer;

[0027] 7. Telescopic rod; 8. Compression spring. Detailed Implementation

[0028] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0029] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0030] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0031] This application discloses a glass optical thickness gauge. (Refer to...) Figures 1 to 5 The glass optical thickness gauge includes a thickness measuring stage 1, a light shield 2, a laser emitter 3, a receiving component 4, a rotating clamping component 5, and a polarized light filtering component 6. The light shield 2 is fixedly connected to the top of the thickness measuring stage 1, the laser emitter 3 is installed on the inner side of the top of the light shield 2, the receiving component 4 is movably connected to the bottom of the thickness measuring stage 1, the rotating clamping component 5 is installed in the middle of the thickness measuring stage 1, and the polarized light filtering component 6 is installed on the outer surface of the rotating clamping component 5.

[0032] The light shield 2 is used to house the laser emitter 3 and block external light sources. The laser emitter 3 is used to emit short-pulse lasers to the glass. The rotating clamping assembly 5 is used to clamp the glass and eliminate the reflected light from the front surface by rotating the glass, retaining only the transmitted main signal. The polarization filter assembly 6 is used to filter impurity polarized light outside the light spot in the synchronous cooperation of the rotating clamping assembly 5.

[0033] The rotary clamping assembly 5 includes a hollow cover 51, a DC motor 52, a connecting shaft 53, a positioning frame 54, a stepper motor 55, a precision grinding plate with a shaft 56, and a docking frame 57. The hollow cover 51 is fixedly connected to the surface of the thickness measuring table 1. The DC motor 52 is installed inside the hollow cover 51. The connecting shaft 53 is installed on the outside of the output end of the DC motor 52. One side of the positioning frame 54 is fixedly connected to one end of the connecting shaft 53. The stepper motor 55 is installed on the inside of the positioning frame 54. The outer side of the shaft end of the precision grinding plate 56 is fixedly connected to the output end of the stepper motor 55. The surface of the docking frame 57 is in contact with the precision grinding surface of the precision grinding plate 56 with the shaft, and the surface of the docking frame 57 clamps the glass.

[0034] The polarization filter assembly 6 includes a support frame 61, a light guide plate 62, a polarizer 63, and a quartz depolarizer 64. The support frame 61 is fixedly connected to the outside of the docking frame 57, the light guide plate 62 is installed on the inside of the support frame 61, the polarizer 63 is snapped into the middle of the light guide plate 62, and the quartz depolarizer 64 is installed below the polarizer 63.

[0035] The receiving component 4 includes a linear motor 41, an adjusting plate 42, and a photodetector 43. The linear motor 41 is installed on the bottom inner side of the thickness measuring platform 1, the adjusting plate 42 is installed above the moving end of the linear motor 41, and the photodetector 43 is installed on the top of the adjusting plate 42.

[0036] The connection between the shaft-driven precision grinding plate 56 and the positioning frame 54 is also provided with a telescopic rod 7 and a compression spring 8. The two sides of the compression spring 8 are fixedly connected to the surfaces of the docking frame 57 and the positioning frame 54, respectively, and the telescopic rod 7 is installed on the inner side of the compression spring 8.

[0037] Polarizer 63 and quartz depolarizer 64 are symmetrically distributed on the outside of shafted fine grinding plate 56 via docking frame 57, and the light plates of polarizer 63 and quartz depolarizer 64 are in contact with the surface of glass.

[0038] The general process of using the glass optical thickness gauge in this embodiment is as follows:

[0039] The glass to be tested is placed in the middle of the thickness measuring stage 1, ensuring it is positioned between the docking frame 57 of the rotating clamping assembly 5 and the shaft-mounted fine grinding plate 56. The DC motor 52 is started, and the positioning frame 54 is driven by the connecting shaft 53 to coarsely adjust the glass clamping position. The compression spring 8 and the telescopic rod 7 automatically apply balanced pressure to ensure that the glass does not slip or deform. During incident angle calibration, the angle of the shaft-mounted fine grinding plate 56 is finely adjusted by the stepper motor 55 so that the glass surface is at a preset oblique angle to the laser beam. The polarizer 63 of the polarization filter assembly 6 rotates synchronously to be orthogonal to the laser polarization direction, maximizing the suppression of reflected light from the front surface. During operation, the laser emitter 3 emits a short pulse laser, which penetrates the glass and is guided by the light guide plate 62 to the polarizer 63 to filter stray polarized light. The remaining light signal is eliminated by the quartz depolarizer 64 to remove residual polarization noise, forming a pure light spot. The photodetector 43 captures the position of the light spot in real time, and the linear motor 41 drives the adjustment plate 42 to move, tracking the center of the light spot. Rotate the glass to the next incident angle, and then repeat the above steps to obtain another set of light spot offsets. Output the thickness value according to the trigonometric distance measurement equation to complete the glass thickness measurement.

[0040] The beneficial technical effects of the glass optical thickness gauge in this application are roughly as follows:

[0041] This device precisely controls the glass tilt angle using a stepper motor 55 in conjunction with a shaft-mounted precision grinding plate 56, allowing the laser beam to be incident at a controllable oblique angle, meeting the geometric requirements of the triangulation method. In the clamped state, the polarizer 63 and quartz depolarizer 64 are tightly fitted to the glass via a mounting bracket 57. The polarizer 63 filters stray light from non-target polarization directions, and the quartz depolarizer 64 disrupts residual polarization noise, ensuring that the photodetector 43 only responds to the light intensity signal. This suppresses interference spots caused by multiple reflections within the glass, thereby reducing light energy loss. Furthermore, a linear motor 41 drives the photodetector 43 to achieve real-time tracking of the light spot position, enabling the device to automatically compensate for light spot shifts caused by glass rotation without manual intervention.

[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A glass optical thickness gauge, characterized in that, The device includes a thickness measuring stage (1), a light shield (2), a laser emitter (3), a receiving component (4), a rotating clamping component (5), and a polarizing light filtering component (6). The light shield (2) is fixedly connected to the top of the thickness measuring stage (1), the laser emitter (3) is installed on the inner side of the top of the light shield (2), the receiving component (4) is movably connected to the bottom of the thickness measuring stage (1), the rotating clamping component (5) is installed in the middle of the thickness measuring stage (1), and the polarizing light filtering component (6) is installed on the outer surface of the rotating clamping component (5). The light shield (2) is used to house the laser emitter (3) and block external light sources. The laser emitter (3) is used to emit short-pulse lasers to the glass. The rotating clamping assembly (5) is used to clamp the glass and eliminate the reflected light from the front surface by rotating the glass, retaining only the transmitted main signal. The polarization filter assembly (6) is used to filter impurity polarized light outside the light spot under the synchronous cooperation of the rotating clamping assembly (5).

2. The glass optical thickness gauge according to claim 1, characterized in that, The rotating clamping assembly (5) includes a hollow cover (51), a DC motor (52), a connecting shaft (53), a positioning frame (54), a stepper motor (55), a precision grinding plate with shaft (56), and a docking frame (57). The hollow cover (51) is fixedly connected to the surface of the thickness measuring table (1). The DC motor (52) is installed inside the hollow cover (51). The connecting shaft (53) is installed outside the output end of the DC motor (52). One side of the positioning frame (54) is fixedly connected to one end of the connecting shaft (53). The stepper motor (55) is installed inside the positioning frame (54). The outer side of the shaft end of the precision grinding plate with shaft (56) is fixedly connected to the output end of the stepper motor (55). The surface of the docking frame (57) is in contact with the precision grinding surface of the precision grinding plate with shaft (56), and the surface of the docking frame (57) is clamped to the glass.

3. The glass optical thickness gauge according to claim 2, characterized in that, The polarization filter assembly (6) includes a support frame (61), a light guide plate (62), a polarizer (63), and a quartz depolarizer (64). The support frame (61) is fixedly connected to the outside of the docking frame (57). The light guide plate (62) is installed on the inside of the support frame (61). The polarizer (63) is snapped into the middle of the light guide plate (62). The quartz depolarizer (64) is installed below the polarizer (63).

4. The glass optical thickness gauge according to claim 1, characterized in that, The receiving component (4) includes a linear motor (41), an adjustment plate (42), and a photodetector (43). The linear motor (41) is installed on the bottom inner side of the thickness measuring platform (1), the adjustment plate (42) is installed above the moving end of the linear motor (41), and the photodetector (43) is installed on the top of the adjustment plate (42).

5. The glass optical thickness gauge according to claim 2, characterized in that, A telescopic rod (7) and a compression spring (8) are also provided at the connection between the shaft-driven precision grinding plate (56) and the positioning frame (54). The two sides of the compression spring (8) are fixedly connected to the surfaces of the docking frame (57) and the positioning frame (54) respectively. The telescopic rod (7) is installed on the inner side of the compression spring (8).

6. The glass optical thickness gauge according to claim 3, characterized in that, The polarizer (63) and the quartz depolarizer (64) are symmetrically distributed on the outside of the shafted fine grinding plate (56) through the docking frame (57), and the light plates of the polarizer (63) and the quartz depolarizer (64) are in contact with the surface of the glass.

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