Detection method and detection device for torsion angle of optical fiber image inverter

Abstract

The invention relates to an optical fiber image inverter torsion angle detection device and a detection method thereof. The detection device comprises a workbench, a light source, a cross reticle, a positioning cylinder, a magnifying lens, an angle cross curve and a digital display angle sensor. The cross reticle is mounted on the upper surface of the workbench, and the positioning cylinder is mounted on the cross reticle; a light source is arranged below the cross reticle; a magnifying lens, an angle cross curve and a digital display angle sensor are arranged above the positioning cylinder, an observation window is arranged above the magnifying lens, and the digital display angle sensor and the angle cross curve are arranged on the observation window. By adopting the method and the device for detecting the torsion angle of the optical fiber image inverter, the torsion angle of the optical fiber image inverter can be quickly measured, the numerical value of the torsion angle can be easily and automatically detected by adopting the device, and the detection device is small and light, can be randomly moved and automatically detected, and is high in test efficiency and low in price. The detection method is simple and convenient, the test result is accurate and reliable, and the test performance index is stable.

Description

Technical Field

[0001] The present invention relates to the field of performance detection of fiber optic image inverters, and particularly to a method and a device for detecting the torsion angle of a fiber optic image inverter. Background Art

[0002] Low-light imaging technology uses photons-photoelectrons as the information carriers of the scene image. Based on the principles of external photoelectric effect, electron multiplication, and photoelectric conversion of devices, it captures, converts, and enhances the images of scenes under night sky low light or other non-visible light illuminations, and finally displays them as visible images to the human eye. Low-light night vision technology is also known as image intensification technology. The structural principle of an image intensifier is that a weak optical image is input through the input window of a fiber optic image transmission element, then converted into a weak electron image through a photocathode, then the electron image is enhanced through a microchannel plate, and finally an output enhanced optical image visible to the human eye is formed through a fluorescent screen.

[0003] The fiber optic image inverter is an optoelectronic imaging component with excellent performance. Its most typical application is as the optical output window of a low-light image intensifier, which plays an important role in improving the quality of imaging devices. The image transmission mechanism of the fiber optic image inverter is realized by using the total reflection principle of optical fibers. The optical fibers that make up the fiber optic image inverter are prepared by combining rod and tube and vacuum drawing processes, using a low-refractive-index skin glass tube, a high-refractive-index core glass rod, and a light-absorbing glass filament that efficiently absorbs stray light, through hot melt pressing, blank processing, and torsion forming. The fiber optic image inverter is a rigid fiber optic image transmission component prepared by densely packing and arranging thousands of micron-level optical fiber filaments, through hot melt pressing and torsion forming, which can invert the input image by 180° for output. Due to the characteristics of small size, light weight, and zero optical thickness of the fiber optic image inverter, in low-light night vision image intensifiers, the fiber optic image inverter is usually used to solve the problem of image inversion in the front-end imaging system. The torsion angle is an important performance index of the fiber optic image inverter. Currently, in the existing technology, the method for detecting the 180° torsion angle of the fiber optic image inverter is to use a projector for testing. However, for the detection method using a projector, the internal optical path structure of the projector equipment used is complex, with high requirements for the light source and optical path. Moreover, due to the addition of a projection screen, the equipment is large and heavy, not easy to move and carry, and occupies a large space, resulting in a very high price for each projector equipment. Many auxiliary tooling and fixtures are also required during testing, which brings inconvenience to use and detection. Moreover, during each test, manual visual calibration and focusing are required, and the test results are greatly affected by the differences in manual visual observation. The cumbersome operation requires high skills from the operators, resulting in low precision testing efficiency for the torsion angle of the fiber optic image inverter, inaccurate test values, high labor intensity, and the test precision being related to the observation level of the operators. This leads to low testing efficiency for the torsion angle, unstable detection quality, and the inability to automatically save and output the test results, making it impossible to quickly trace a large amount of production data, which greatly affects the labor productivity and performance detection stability of fiber optic image inverter products. Summary of the Invention

[0004] The main object of the present invention is to provide a detection method for the torsion angle of a fiber optic image inverter with high testing efficiency and stable testing performance indicators.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A detection device for the torsion angle of a fiber optic image inverter includes a workbench, a light source, a crosshair reticle, a positioning cylinder, a magnifying glass, an angular crosshair, and a digital display angular sensor;

[0007] The crosshair reticle is installed on the upper surface of the workbench,

[0008] The positioning cylinder is fixedly installed on the crosshair reticle;

[0009] A light source is provided below the cross reticle.

[0010] A magnifying glass, an angular crosshair, and a digital display angular sensor are provided above the positioning cylinder.

[0011] An observation window is provided above the magnifying glass. A digital display angular sensor is provided on the observation window, and an angular crosshair is provided on the observation window.

[0012] The light source is arranged in a lamp box. A workbench is provided on the lamp box. A support rod is fixed on one side of the lamp box. An observation component is provided on the support rod. A magnifying glass, an observation window, an angular crosshair, and a digital display angular sensor are fixed on the observation component. An angular display is further provided on the observation component. The digital display angular sensor is connected to the angular display.

[0013] The digital display angular sensor can measure the angle by rotation and display the measured angle value.

[0014] The magnifying glass has a magnification of 10 - 50 times.

[0015] The cross reticle is fixed at the central position of the workbench; the observation component is fixed on the support rod by fastening screws; the brightness of the light source can be adjusted.

[0016] A camera device is further installed on the observation window. The test lens of the camera device is connected to an image processor and an image display screen for processing images through a data cable; the image display screen can display the crosshair on the cross reticle.

[0017] The image processor can store images and various information. The various information includes the angular image of the test, the numerical result of the test angle, and the crosshair image of the cross reticle. The image processor can read and display the data of the various information, can also edit the independent data and save it in csv format, and can perform data editing and saving in Excel.

[0018] The present invention also provides an application of the detection device for the torsion angle of the optical fiber image inverter as described above in the test of the optical fiber image inverter.

[0019] The height of the optical fiber image inverter is 10 - 160 mm, and the accuracy of the measured torsion angle is ±0.1°.

[0020] The present invention also provides a method for detecting the torsion angle of an optical fiber image inverter, including the following steps:

[0021] (1) Prepare a workpiece of the optical fiber image inverter to be tested and an untwisted blank of the optical fiber image inverter with the same height as the workpiece of the optical fiber image inverter to be tested for standby.

[0022] (2) Fix the cross reticle in advance at the central position of the workbench, set the center of the positioning cylinder to coincide with the center of the cross reticle, and fixedly install the positioning cylinder on the cross reticle. Place the untwisted optical fiber image inverter blank plate fixedly in the positioning cylinder.

[0023] (3) Turn on the light source on the workbench. At this time, the image of the cross reticle on the workbench is transmitted to the surface of the untwisted optical fiber image inverter blank plate. Adjust the height of the magnifying glass, observe the cross reticle image formed on the surface of the untwisted optical fiber image inverter blank plate through the observation window above the magnifying glass, and then rotate the digital display angle sensor so that the angle crosshair scale on the digital display angle sensor coincides with the crosshair of the cross reticle. At this time, it is the zero position of the twisting angle of the optical fiber image inverter, and record the first rotation angle through the angle display.

[0024] (4) Take out the untwisted optical fiber image inverter blank plate, place the optical fiber image inverter workpiece to be tested in the positioning cylinder on the reticle. At this time, the image of the cross reticle formed after passing through the optical fiber image inverter workpiece to be tested is transmitted to the surface of the optical fiber image inverter workpiece to be tested as an inverted image. Then observe the cross reticle image formed on the surface of the optical fiber image inverter workpiece to be tested through the magnifying glass, rotate the digital display angle sensor so that the angle crosshair scale on the digital display angle sensor coincides with the crosshair of the cross reticle again, and record the second rotation angle through the angle display. The difference between the first rotation angle and the second rotation angle is the twisting angle value of the optical fiber image inverter.

[0025] Further, it also includes transmitting the image of the cross reticle and the test data obtained each time through the test lens to the image display screen, and saving or transmitting the test data again.

[0026] Compared with the technical solutions of the existing twisting angle test devices, the present invention has at least the following advantages:

[0027] After adopting the detection method and device for the twisting angle of the optical fiber image inverter of the present invention, the twisting angle of the optical fiber image inverter can be measured quickly. The twisting angle of the test sample can also provide relevant information from the image obtained by the camera of the imaging device, and the rotation angle can also be automatically read by the manually rotated angle sensor. Therefore, the measurement efficiency of the twisting angle can be improved. Moreover, when using this device to test the twisting angle of the optical fiber image inverter, the twisting angle value can be easily and automatically detected. The detection instrument is small and light, can be moved around at will and can automatically detect. The test efficiency is high, and the price of the test device is low. This detection method is simple and convenient, and has the advantages of accurate and reliable test results and stable test performance indicators.

[0028] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and be able to implement it according to the content of the description, the following will describe in detail the preferred embodiments of the present invention as follows. Brief Description of the Drawings

[0029] Figure 1 FIG. 1 is a schematic structural diagram of a device for detecting the torsion angle of an optical fiber image inverter provided by an embodiment of the present invention;

[0030] Figure 2 FIG. 2 is another schematic structural diagram of a device for detecting the torsion angle of an optical fiber image inverter provided by an embodiment of the present invention;

[0031] Figure 3 FIG. 3 is a partial cross-sectional view of a device for detecting the torsion angle of an optical fiber image inverter provided by an embodiment of the present invention;

[0032] Figure 4 FIG. 4 is a schematic diagram of the test result of the torsion angle provided by an embodiment of the present invention.

[0033] In the figures:

[0034] 1 - light source switch knob; 2 - workbench; 3 - digital display angle sensor, 4 - angle display; 5 - observation component; 6 - fastening screw; 7 - light box; 8 - support rod;

[0035] 10 - test lens; 11 - data line; 12 - image display screen;

[0036] 201 - light source, 202 - cross reticle, 203 - positioning cylinder, 204 - optical fiber image inverter workpiece to be tested; 205 - magnifying glass;

[0037] 301 - observation window, 302 - angle cross line, 303 - reticle cross line. Detailed Embodiment

[0038] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will, in combination with the preferred embodiments, describe in detail the specific embodiments, structures, features, and effects of the present invention as follows. In the following description, different "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0039] Refer to Figure 1 , a device for detecting the torsion angle of an optical fiber image inverter, comprising a workbench 2, a light source, a cross reticle, a positioning cylinder, a magnifying glass, an angle cross line, and a digital display angle sensor 3;

[0040] The cross reticle is installed on the upper surface of the workbench 2, and the positioning cylinder is fixedly installed on the cross reticle, and the center of the positioning cylinder coincides with the center position of the cross reticle;

[0041] A light source is provided on the workbench 2, and the light source is located below the reticle;

[0042] Above the positioning cylinder, there are a magnifying glass 205 and a digital display angle sensor 3.

[0043] Above the magnifying glass 205, there is an observation window. The digital display angle sensor 3 is provided on the observation window, and the observation window is provided with angle crosshairs.

[0044] The digital display angle sensor of the present invention can automatically read the code inside the manually rotatable angle sensor. Therefore, it can quickly measure the torsion angle of the fiber image inverter, and can achieve the effects of accurate and reliable test results and stable test performance indicators. The positioning cylinder of the present invention is used to place the fiber image inverter and the blank of the fiber image inverter to be tested, and plays the role of optical centering.

[0045] Preferably, the light source is arranged in the lamp box 7. The workbench 2 is provided on the lamp box 7. A support rod 8 is fixed on one side of the lamp box 7. The observation component 5 is fixed on the support rod 8. A magnifying glass, an observation window, angle crosshairs and a digital display angle sensor 3 are fixed on the observation component 5. An angle display 4 is also provided on the observation component 5. The digital display angle sensor 3 is connected to the angle display 4. The digital display angle sensor 3 can display the real-time rotation angle value on the angle display 4.

[0046] The present invention fixes the magnifying glass, the angle crosshairs and the digital display angle sensor above the workpiece to be tested through the support rod and the observation component, which is convenient for detecting the angle of the workpiece to be tested. The digital display angle sensor can measure the angle by rotation and display the measured angle value.

[0047] Preferably, the magnification of the magnifying glass 205 is 10 - 50 times. The magnification of the magnifying glass can be adjusted according to the height of the fiber image inverter to be tested and the test field of view. When the magnification of the magnifying glass is less than 10 times, the image of the reticle on the surface of the fiber image inverter cannot be clearly observed through the fiber image inverter; when the magnification of the magnifying glass is greater than 50 times, the test field of view is too small to accurately measure the torsion angle value of the fiber image inverter.

[0048] Preferably, the cross reticle is fixed at the center position of the workbench 2; the observation component 5 is fixed on the support rod 8 through the fastening screw 6, and the brightness of the light source is adjusted by the light source switch knob 1.

[0049] For easy detection, the reticle is fixed at the center position of the workbench; the test height of the observation component on the support rod is adjusted by the fastening screw 6, that is, the test height of the magnifying glass is adjusted to make the observed crosshair clearer. After the test height of the magnifying glass is adjusted, the observation component is fixed on the support rod by the fastening screw 6. The brightness of the light source is adjusted by the light source switch knob to adjust the clarity of the imaging.

[0050] See Figure 2 , a fiber optic image inverter torsion angle test device including an image processing device provided by the present invention. The image of the test reticle is passed through the test lens 10 and then transmitted to the image display screen 12 through the data line 11.

[0051] Specifically, in order to realize the automatic recognition, storage and operation of data, a camera device is further installed on the observation window. The test lens 10 of the camera device is connected to an image processor for processing images and an image display screen 12 through a data line 11, and the image display screen 12 can display the crosshair image on the reticle.

[0052] Furthermore, the image processor can store images and various information. The various information includes the test angle image, the test angle numerical result, the crosshair image of the reticle, etc. The image processor can read and display the data of the various information, and can also edit the independent data and save it in csv format, and can perform data editing and saving in Excel.

[0053] The present invention also provides an application of a fiber optic image inverter torsion angle test device in the test of a fiber optic image inverter.

[0054] For the said application, the height of the fiber optic image inverter is 10 - 160 mm, and the accuracy of the tested torsion angle is ±0.1°.

[0055] See Figure 1 and Figure 3 , a method for detecting the torsion angle of a fiber optic image inverter provided by the present invention, comprising the following steps:

[0056] (1) Prepare a fiber optic image inverter workpiece 204 to be tested and an untwisted fiber optic image inverter blank plate of the same height as the fiber optic image inverter workpiece to be tested for standby;

[0057] (2) Fix the reticle 202 in advance at the center position of the workbench 2, set the center of the positioning cylinder 203 to coincide with the center of the reticle 202, and fixedly install the positioning cylinder 203 on the reticle 202, and fixedly place the untwisted fiber optic image inverter blank plate in the positioning cylinder 203;

[0058] (3) Turn on the light source 201 on the workbench 2. Using the image transmission principle of the "optical zero thickness" of the fiber optic image transmission element, transmit the crosshair image of the crosshair reticle 202 on the workbench 2 to the surface of the untwisted fiber optic image inverter blank. Adjust the height of the magnifying glass 205, and observe the image of the crosshair reticle 202 formed on the surface of the untwisted fiber optic image inverter blank through the observation window above the magnifying glass 205. Then rotate the digital display angle sensor 206, and observe again through the observation window above the magnifying glass, so that the angle crosshair scale on the digital display angle sensor 206 coincides with the crosshairs of the crosshair reticle 202. At this time, it is the zero position of the twisting angle of the fiber optic image inverter. Record the first rotation angle through the angle display 4;

[0059] (4) Take out the untwisted fiber optic image inverter blank, and place the fiber optic image inverter workpiece 204 to be tested in the positioning cylinder 203 on the crosshair reticle 202. At this time, the image of the crosshairs of the crosshair reticle transmitted through the fiber optic image inverter workpiece 204 to be tested forms an inverted image on the surface of the fiber optic image inverter workpiece 204 to be tested. Observe the image of the crosshair reticle 202 formed on the surface of the fiber optic image inverter workpiece 204 to be tested through the observation window above the magnifying glass 205. Rotate the digital display angle sensor so that the angle crosshairs coincide with the crosshairs of the crosshair reticle again. Record the second rotation angle through the angle display 4; The difference between the first rotation angle and the second rotation angle is the twisting angle value of the fiber optic image inverter.

[0060] When the digital display angle sensor rotates clockwise, the displayed numerical value is the positive angle value, indicating that the twisting angle is greater than 180 degrees; when the digital display angle sensor rotates counterclockwise, the displayed numerical value is the negative angle value, indicating that the twisting angle is less than 180 degrees. For example, if the first rotation angle value is 0 degrees and the second rotation angle is +0.5 degrees, then the twisting angle of the fiber optic image inverter is 180° + 0.5°; if the first rotation angle value is 0 degrees and the second rotation angle is -0.5 degrees, then the twisting angle of the fiber optic image inverter is 180° - 0.5°.

[0061] See Figure 4 , through the observation window, it can be seen that the periphery is the observation window 302 with angle crosshairs. The angle crosshair 301 is provided on the observation window 302. The inside of the observation window 302 is the crosshair reticle 202, and the reticle crosshair 303 is provided on the crosshair reticle 202.

[0062] See Figure 2 and Figure 3 , it is also possible to transmit the image of the crosshair reticle 202 obtained in each test to the image display screen 12 through the test lens 10 and the data line 11. After image processing, the difference between the first rotation angle and the second rotation angle is displayed on the image display screen, which is the twisting angle value of the fiber optic image inverter.

[0063] As described above, it is only the preferred embodiment of the present invention and does not impose any formal restrictions on the present invention. Although the present invention has been disclosed above with the preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A device for detecting the torsion angle of an optical fiber image invertor, characterized in that: It includes a workbench, a light source, a cross-reticle plate, a positioning tube, a magnifying glass, an angle crosshair and a digital angle sensor; The cross-reticle plate is mounted on the upper surface of the workbench. The positioning tube is fixedly mounted on the cross-reticle plate; A light source is provided below the cross-reticle plate; A magnifying glass, an angle crosshair and a digital angle sensor are provided above the positioning tube; An observation window is arranged above the magnifying glass, a digital angle sensor is arranged on the observation window, and an angle cross line is arranged on the observation window.

2. The detection device according to claim 1, characterized in that: The light source is arranged in a light box, a workbench is provided on the light box, a support rod is fixed on one side of the light box, an observation component is provided on the support rod, a magnifying glass, an observation window, an angle crosshair and a digital angle sensor are fixed on the observation component, an angle display is also provided on the observation component, and the digital angle sensor is connected to the angle display.

3. The detection device according to claim 2, characterized in that: The magnification of the magnifying glass is 10-50 times.

4. The detection device according to claim 3, characterized in that: The cross-reticle plate is fixed at the center of the workbench; the observation component is fixed to the support rod by fastening screws; and the brightness of the light source can be adjusted.

5. The detection device according to any one of claims 1 to 4, characterized in that: A camera device is also installed on the observation window, and a test lens of the camera device is connected to an image processor for processing images and an image display screen through a data line; the image display screen can display the crosshairs on the cross-reticle plate.

6. The detection device according to claim 5, characterized in that: The image processor can store images and various information, including the tested angle image, the tested angle numerical result and the cross-line image of the cross-reticle. The image processor can read and display the data of the various information, edit independent data and save it in csv format, and edit and save data in Excel.

7. Application of the device for detecting the twisting angle of an optical fiber image inverter according to any one of claims 1 to 6 in testing an optical fiber image inverter.

8. The use according to claim 7, characterized in that: The height of the optical fiber image invertor is 10-160 mm, and the accuracy of the tested torsion angle is ±0.1°.

9. A method for detecting the torsion angle of an optical fiber image invertor, characterized in that: The following steps are involved: (1) preparing a fiber optic image inverter workpiece to be tested and an untwisted fiber optic image inverter blank plate at the same height as the fiber optic image inverter workpiece to be tested for standby use; (2) Fix the cross-reticle plate in the center of the workbench in advance, set the center of the positioning tube to coincide with the center of the cross-reticle plate, and fix the positioning tube on the cross-reticle plate, and fix the untwisted fiber optic image invertor blank in the positioning tube; (3) Turn on the light source. At this time, the image of the cross-reticle plate on the workbench is transmitted to the surface of the untwisted fiber optic image inverter blank. The height of the magnifying glass is adjusted. The image of the cross-reticle plate formed on the surface of the untwisted fiber optic image inverter blank is observed through the observation window above the magnifying glass. Then, the digital angle sensor is rotated so that the angle cross-line scale on the digital angle sensor coincides with the cross-line of the cross-reticle plate. At this time, the zero point position of the twist angle of the fiber optic image inverter is obtained. The first rotation angle is recorded by the angle display; (4) Take out the untwisted fiber optic image inverter blank, and place the fiber optic image inverter workpiece to be tested in the positioning tube on the graticule plate. At this time, the image formed by the crosshairs of the graticule plate after the fiber optic image inverter workpiece to be tested passes through is transmitted to the surface of the fiber optic image inverter workpiece to be tested as an inverted image. Then, observe the image of the crosshairs plate formed on the surface of the fiber optic image inverter workpiece to be tested through a magnifying glass, rotate the digital angle sensor so that the angle crosshairs scale on the digital angle sensor coincides with the crosshairs of the crosshairs of the crosshairs plate again, and obtain the second rotation angle by recording on the angle display; the difference between the first rotation angle and the second rotation angle is the twist angle value of the fiber optic image inverter.

10. The detection method according to claim 9, characterized in that: It also includes transmitting the image of the cross-reticle plate and the test data obtained from each test to the image display screen through the test lens, and saving or transmitting the test data again.

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