Novel microscopic vision displacement sensor based on image processing view

Abstract

The utility model provides a kind of novel microscopic vision displacement sensor under the view of image processing, micro displacement monitoring field, comprising: bushing, for fixed on auxiliary work, bushing has first mark in it;Probe for abutting on the workpiece to be measured, along the axial direction of bushing is set in bushing, and can move in the axial direction of bushing, the part of probe in bushing has second mark;Image acquisition module is set on the radial direction of the bushing for obtaining the image containing the first, second mark in axial direction interval distance and outputting the image, the present application utilizes image processing technology, and the first, second mark little distance is converted into digital image by image acquisition module, digital image can be subsequently processed by the software of PC end, using image vision measurement principle, the mapping relationship of pixel space and physical space is established, pixel unit is converted into physical unit, to obtain the real distance of the first, second mark.

Description

Technical Field

[0001] This utility model relates to the field of micro-displacement monitoring, and in particular to a novel microscopic visual displacement sensor based on image processing. Background Technology

[0002] In the field of structural health monitoring in civil engineering, the measurement of minute displacements plays a crucial role in assessing structural safety, diagnosing early damage, and providing disaster warnings. For example, monitoring changes in minute displacements is essential for diagnosing and evaluating the structural safety performance in areas such as crack propagation, fatigue deformation of steel structural members, and minute vibrations in roads and bridges.

[0003] Existing micro-displacement measurement sensors are mainly represented by capacitive displacement sensors, fiber optic displacement sensors, and laser displacement sensors, but they still have certain limitations. These limitations include: (1) Capacitive displacement sensors have a small range, usually <1mm, require high parallelism in installation, and are easily affected by the external environment (such as humidity, oil stains, etc., which can cause capacitance drift); (2) Fiber optic displacement sensors may experience decreased accuracy, slow dynamic response, and wavelength drift due to improper fiber bonding or implantation, and are easily affected by temperature, with a cost of no less than a thousand yuan, making large-scale application difficult; (3) Laser displacement sensors are affected by harsh environments, resulting in decreased accuracy, are easily affected by the surface reflectivity of the measured object, leading to signal instability, and have a cost of over ten thousand yuan. Most of these sensors require additional data acquisition and analysis devices, which undoubtedly increases the measurement cost.

[0004] With the development of image processing technology and digital microscopes, how to use digital microscopes to obtain minute displacements has become a new direction in this field. Utility Model Content

[0005] This invention provides a novel microscopic visual displacement sensor based on image processing perspective. Its purpose is to provide a micro-displacement sensor that, while ensuring monitoring accuracy, has the advantages of convenient installation and is not easily affected by the environment.

[0006] To achieve the above objectives, embodiments of this utility model provide a novel microscopic visual displacement sensor based on image processing perspective, comprising:

[0007] A sleeve, used for fixing to an auxiliary working object, has a first mark inside the sleeve.

[0008] The probe, which is used to abut against the workpiece being tested, is inserted into the sleeve along the axial direction of the sleeve and can move along the axial direction of the sleeve. The portion of the probe located inside the sleeve has a second mark.

[0009] An image acquisition module is configured on the radial side of the sleeve to acquire an image containing a first mark and a second mark spaced apart axially and to output the image.

[0010] Preferably, the sleeve is further provided with a clamp at both the front and rear ends for fixing the sleeve to the auxiliary workpiece.

[0011] Preferably, the sleeve has a sealing plate at its front end, the sealing plate has a central hole at its center, the probe has a probe at its front end, the probe is inserted into the sleeve through the central hole at its rear end, and the probe is covered with an elastic element, one end of the elastic element abutting against the sealing plate and the other end abutting against the probe.

[0012] Preferably, the sleeve is further provided with two partitions arranged at intervals along the axial direction of the sleeve. Each partition has a central hole, which is used for the probe to pass through to keep the probe coaxial with the sleeve.

[0013] Preferably, a limiting platform is further provided inside the sleeve, and the limiting platform has a platform surface parallel to the axis of the sleeve;

[0014] A scale is fixed on the table surface, and the scale is arranged along the axial direction of the sleeve. The distance between adjacent scales is 0.1 mm, and the first mark is any of the scales.

[0015] Preferably, a measurement window for mounting an image acquisition module is provided on the side wall of the sleeve.

[0016] Preferably, the image acquisition module is a digital microscope with a field of view diameter of 3 mm and a magnification of 200-1600 times.

[0017] Preferably, the sleeve is made of carbon fiber material.

[0018] Preferably, the probe is made of a rigid material.

[0019] The above-mentioned solution of this utility model has the following beneficial effects:

[0020] This application utilizes the image acquisition module's ability to acquire and convert observation images into digital images, records the relative displacement of two markers, and converts this relative displacement into a digital image. This is combined with existing digital image processing techniques to obtain the true minute displacement between the workpiece under test and the auxiliary workpiece.

[0021] In this application, the displacement of the workpiece under test is transferred to the field of view of the image acquisition module by a probe, which effectively reduces the field of view requirement of the image acquisition module. At the same time, with the rapid development of the image acquisition module, the acquisition accuracy is also getting higher and higher, which can accurately acquire the relative displacement of two markers, thereby providing more accurate analytical data for subsequent analysis using digital images.

[0022] This application features high precision, easy installation, and is not easily affected by the environment, allowing for large-scale deployment. Other features and advantages of this invention will be described in detail in the subsequent detailed description section. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the appearance of this utility model;

[0024] Figure 2 This is a cross-sectional view of the present invention parallel to the axial direction of the sleeve;

[0025] Figure 3 yes Figure 1 Sectional view of AA (without frame clamps).

[0026] [Explanation of Labels in the Attached Image]

[0027] 10-Sleeve, 11-Sealing plate, 12-Partition plate, 13-Limiting platform, 14-Scale,

[0028] 20-Probe, 21-Probe, 22-Elastic element

[0029] 30-Image Acquisition Module

[0030] 40-frame clamps. Detailed Implementation

[0031] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 3 As shown, an embodiment of this utility model provides a novel microscope visual displacement sensor based on image processing perspective, including a sleeve 10 for fixing to an auxiliary workpiece. A first mark is located within the sleeve 10, and a probe 20 is also inserted within the sleeve 10. The probe 20 moves along the axial direction of the sleeve 10 and abuts against the workpiece being measured. A second mark is located on the portion of the probe 20 located within the sleeve 10. Understandably, the distance between the first mark on the sleeve 10 and the second mark on the probe 20 changes as the probe 20 moves axially.

[0033] An image acquisition module 30 is also provided on the sleeve 10. The image acquisition module 30 is arranged radially along the sleeve 10. The image acquisition module 30 can obtain an image containing the position information of the first mark and the second mark, and output the image as electronic information for processing by a PC or microcontroller.

[0034] When using this application, the sleeve 10 needs to be fixed on the auxiliary workpiece, and one end of the probe 20 needs to be abutted against the workpiece to be tested. When a small displacement occurs between the auxiliary workpiece and the workpiece to be tested, the probe 20 will move, thereby changing the distance between the first mark and the second mark. The image acquisition module 30 records the moving distance of the first mark and the second mark and outputs it in the form of electronic information.

[0035] After acquiring electronic information containing the first and second markers, the user uses existing digital image visual measurement technology to establish a mapping relationship between pixel distances in the image and real physical distances through calibration, converting pixel units into physical units. By comparing different images, the user can obtain the real distance between the first and second markers, and thus obtain the real minute displacements of the auxiliary workpiece and the workpiece being measured.

[0036] Understandably, there should be a height difference between the workpiece being tested and the auxiliary workpiece, and the auxiliary workpiece should be positioned before the workpiece being tested so that the probe 20 can abut against the workpiece being tested.

[0037] Furthermore, in order to facilitate fixing the sleeve 10 to the auxiliary workpiece, the front and rear ends of the sleeve 10 are respectively equipped with clamps 40. The clamps 40, also known as clamps, are metal fasteners that fix pipes, cables and other objects by clamping. The sleeve 10 can be effectively fixed to the auxiliary workpiece by the use of clamps 40 and bolts at both ends, thus preventing the sleeve 10 from moving.

[0038] Furthermore, a sealing plate 11 is provided at the front end of the sleeve 10, and a central hole is provided at the center of the sealing plate 11. The front end of the probe 20 has a probe 21, and the rear end of the probe 20 is inserted into the sleeve 10 through the aforementioned central hole and keeps it aligned with the axis of the sleeve 10. An elastic element 22 is fitted on one end of the probe 20 outside the sleeve 10. One end of the elastic element 22 abuts against the sealing plate 11, and the other end abuts against the probe 21. The elastic element 22 provides the probe 20 with the elastic force to return to its initial position. When the elastic element 22 is in its naturally extended state, the position of the probe 20 is the initial position.

[0039] The use of elastic element 22 helps to maintain the stability of probe 20 during the detection process. Preferably, elastic element 22 is a spring.

[0040] To ensure that the probe 20 remains collinear with the axis of the sleeve 10 during the testing process, two spaced partitions 12 are provided inside the sleeve 10. The two partitions 12 are arranged along the axial direction of the sleeve 10, and each partition 12 has a central hole located at its center. In this application, the partitions 12 and the sleeve 10 have the same circular shape. When the probe 20 is inserted into the central hole, the partitions 12 ensure that the probe 20 remains collinear with the axis of the sleeve 10.

[0041] Furthermore, a limiting platform 13 is provided inside the sleeve 10, the limiting platform 13 having a platform parallel to the axis of the sleeve 10. When viewed in a cross section perpendicular to the axis, the cross-sectional pattern of the limiting platform 13 consists of straight lines and curves, the diameter of which is smaller than the inner wall of the sleeve 10, and the corresponding central angle is a straight angle.

[0042] A scale 14 is also fixed on the aforementioned limiting platform 13. The scale of the scale 14 is arranged along the axial direction of the sleeve 10, with the first mark being any scale. Therefore, when the probe 20 moves relative to the sleeve 10, the relative displacement between the first mark and the second mark can be obtained. Preferably, the first mark is selected from the scales closest to the center. The distance between adjacent scales is 0.1 mm.

[0043] Preferably, the thickness of the scale 14 is the same as the diameter of the probe 20, ensuring that when the scale 14 and the probe 20 are located on the limiting platform 13, the upper edge of the probe 20 is flush with the upper surface of the scale 14. Preferably, the second mark on the probe 20 is formed by laser marking, and the second mark is a circular mark arranged around the circumference of the probe 20, to prevent the second mark from being obscured due to accidental rotation of the probe 20.

[0044] A measuring window is provided on the side wall of the sleeve 10. The image acquisition module is installed at the measuring window, and the first and second marks are located within the field of view of the image acquisition module 30. Preferably, when the image acquisition module 30 is installed at the measuring window, the field of view of the image acquisition module 30 should be perpendicular to the limiting platform 13, thereby improving the accuracy of acquiring the relative distance between the first and second marks.

[0045] In this embodiment, the image acquisition module 30 uses a digital microscope with a field of view diameter of 3 mm and a magnification between 200 and 1600 times.

[0046] Preferably, in this application, the sleeve 10 is made of carbon fiber material, which has the characteristics of high strength, light weight, corrosion resistance and high temperature resistance, and can adapt to different external environments, making the application scope of this application wider.

[0047] Preferably, the probe 20 is made of a rigid material to prevent it from bending due to excessive length extending beyond the sleeve 10. In this embodiment, the probe 20 is made of carbon fiber.

[0048] This application relies on mechanical structures to measure minute displacements, is unaffected by light or external environment, and has a low cost, making it suitable for long-term detection and monitoring of minute displacements.

[0049] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A novel microscopic visual displacement sensor based on image processing perspective, characterized in that, include: A sleeve (10) is used to fix it to an auxiliary workpiece, and the sleeve (10) has a first mark inside; The probe (20) for abutting against the workpiece being tested is inserted into the sleeve (10) along the axial direction and can move along the axial direction of the sleeve (10). The portion of the probe (20) inside the sleeve (10) has a second mark. The image acquisition module (30) is set in the radial direction of the sleeve (10) to acquire an image containing the first mark and the second mark spaced apart in the axial direction and output the image; The sleeve (10) has a sealing plate (11) at its front end, and the sealing plate (11) has a central hole at its center. The probe (20) has a probe (21) at its front end, and the rear end of the probe (20) is inserted into the sleeve (10) through the central hole. The probe (20) is covered with an elastic element (22), one end of which abuts against the sealing plate (11) and the other end of which abuts against the probe (21). The sleeve (10) is also provided with two partitions (12) arranged at intervals along the axial direction of the sleeve (10). The two partitions (12) are respectively provided with central holes. The central holes on the two partitions (12) are used for the probe (20) to pass through so as to keep the probe (20) and the sleeve (10) coaxial.

2. The novel microscopic visual displacement sensor based on image processing field of view according to claim 1, characterized in that: The sleeve (10) is also provided with a clamp (40) at the front end and the rear end for fixing the sleeve (10) to the auxiliary workpiece.

3. The novel microscopic visual displacement sensor based on image processing field of view according to claim 1, characterized in that: The sleeve (10) is also provided with a limiting platform (13), which has a platform parallel to the axis of the sleeve (10); A scale (14) is fixed on the table surface. The scale of the scale (14) is arranged along the axial direction of the sleeve (10). The distance between adjacent scales is 0.1 mm. The first mark is any of the scales.

4. The novel microscopic visual displacement sensor based on image processing field of view according to claim 1, characterized in that: The sleeve (10) has a measurement window on its side wall for installing the image acquisition module (30).

5. The novel microscopic visual displacement sensor based on image processing field of view according to claim 1, characterized in that: The image acquisition module (30) is a digital microscope with a field of view diameter of 3 mm and a magnification of 200-1600 times.

6. The novel microscopic visual displacement sensor based on image processing field of view according to claim 1, characterized in that: The sleeve (10) is made of carbon fiber material.

7. The novel microscopic visual displacement sensor based on image processing field of view according to claim 1, characterized in that: The probe (20) is made of a rigid material.

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