High-precision displacement meter based on bar code ruler and CCD imaging principle

Abstract

The utility model discloses a high precision displacement meter based on bar code scale and CCD imaging principle, which comprises a sealing sleeve, a bar code scale and a miniature camera, the bar code scale and the miniature camera are arranged in the sealing sleeve, one end of the sealing sleeve is coaxially provided with a measuring pull rod capable of sliding along the axial direction of the sealing sleeve, and the miniature camera is arranged at the first end of the measuring pull rod. The bar code scale is fixedly arranged in the sealing sleeve; a lighting device used for lighting the miniature camera is further arranged in the sealing sleeve. And the miniature camera is electrically connected with the upper computer. Displacement measurement is carried out by adopting a visual image processing mode based on a bar code scale, the problems of nonlinear error compensation and the like do not exist, displacement measurement can be realized with high precision under the support of a sub-pixel feature extraction algorithm, and meanwhile, the sealing sleeve is sealed through the sealing ring, can resist water pressure of 1.0 MPa, and is more suitable for field sites.

Description

Technical Field

[0001] This utility model relates to the field of force measuring device technology, and in particular to a high-precision displacement meter based on barcode scale and CCD imaging principle. Background Technology

[0002] Displacement measurement is a common requirement in the field of engineering structural safety monitoring. Traditional displacement gauges generally use vibrating wire, magnetostrictive, resistive (capacitive, inductive) and laser imaging methods. These methods often require complex calculations such as nonlinear error compensation or temperature drift correction, or are subject to problems such as decreased accuracy due to changes in the reflective surface. Moreover, traditional displacement gauges are not resistant to water pressure and are prone to water ingress when used in the field, making it impossible to measure. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a high-precision displacement meter based on barcode scale and CCD imaging principle. The displacement measurement is performed by visual image processing based on barcode scale, which eliminates problems such as nonlinear error compensation. With the support of sub-pixel feature extraction algorithm, the displacement can be measured with high precision. At the same time, the sealing sleeve is sealed by sealing ring and can withstand water pressure of 1.0MPa, making it more suitable for field use.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A high-precision displacement meter based on barcode scale and CCD imaging principle includes a sealed sleeve, a barcode scale and a miniature camera disposed inside the sealed sleeve. One end of the sealed sleeve is coaxially provided with a measuring rod that can slide along its axial direction. The miniature camera is disposed at the first end of the measuring rod. The barcode scale is fixedly disposed inside the sealed sleeve.

[0006] The sealing sleeve is also equipped with an illumination device for illuminating the miniature camera;

[0007] The miniature camera is electrically connected to the host computer.

[0008] Furthermore, the miniature camera is a CCD camera.

[0009] Furthermore, the barcode scale is equipped with a hybrid encoding of QR code and barcode.

[0010] Furthermore, the first end of the measuring rod is provided with an L-shaped connecting plate, and the miniature camera is fixed on the connecting plate.

[0011] Furthermore, the lighting device is a light-emitting diode, and the lighting device is mounted on the connecting plate.

[0012] Furthermore, the second end of the measuring rod extends from the first end of the sealing sleeve, and a rod sealing end is provided between the second end of the measuring rod and the first end of the sealing sleeve.

[0013] Furthermore, a Y-shaped sealing ring is provided between the sealing end of the pull rod and the pull rod.

[0014] Furthermore, the second end of the sealing sleeve is provided with a cable sealing end, the cable sealing end is provided with a cable, and a sealing nut is provided between the cable and the cable sealing end.

[0015] Furthermore, the barcode ruler is equipped with a temperature sensor for measuring the barcode ruler.

[0016] The beneficial effects of this utility model are:

[0017] This invention uses visual image processing based on a barcode scale for displacement measurement, eliminating problems such as nonlinear error compensation. With the support of sub-pixel feature extraction algorithms, it can achieve high-precision displacement measurement. Meanwhile, the sealing sleeve is sealed by a sealing ring and can withstand water pressure of 1.0 MPa, making it more suitable for field applications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the high-precision displacement meter based on the barcode scale and CCD imaging principle in this embodiment of the present invention;

[0019] Figure 2 for Figure 1 Sectional view along line AA;

[0020] Figure 3 for Figure 1 Sectional view along the BB direction;

[0021] Figure 4 for Figure 2 C-axis sectional view;

[0022] In the diagram, 1. Sealing sleeve; 2. Barcode ruler; 3. Miniature camera; 4. Measuring rod; 5. Connecting plate; 6. Rod sealing end; 7. Y-type sealing ring; 8. Cable sealing end; 9. Cable; 10. Sealing nut; 11. Core wire; 12. Lifting eye. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] See Figures 1-4 This utility model provides a technical solution:

[0025] Example:

[0026] like Figures 1-4 As shown, a high-precision displacement meter based on barcode scale and CCD imaging principle includes a sealing sleeve 1, a barcode scale 2 disposed inside the sealing sleeve 1, and a miniature CCD camera. One end of the sealing sleeve 1 is coaxially provided with a measuring rod 4 that can slide along its axial direction. The miniature camera 3 is disposed at the first end of the measuring rod 4. The barcode scale 2 is fixedly disposed inside the sealing sleeve 1. The second end of the measuring rod 4 extends out from the first end of the sealing sleeve 1. A rod sealing end 6 is provided between the second end of the measuring rod 4 and the first end of the sealing sleeve 1. A Y-shaped sealing ring 7 is provided between the rod sealing end 6 and the rod.

[0027] The sealing sleeve 1 is also provided with an illumination device for illuminating the miniature camera 3. The illumination device is a light-emitting diode and is mounted on the connecting plate 5.

[0028] The miniature camera 3 is electrically connected to the host computer. The miniature camera 3 may, but is not limited to, wireless communication with the host computer.

[0029] like Figure 3 As shown, the barcode ruler 2 is equipped with a hybrid encoding of QR code and barcode, and the barcode ruler 2 is equipped with a temperature sensor for measuring the temperature of the barcode ruler 2.

[0030] The measuring rod 4 has an L-shaped connecting plate 5 at its first end, and the miniature camera 3 is fixed on the connecting plate 5.

[0031] The second end of the sealing sleeve 1 is provided with a cable sealing end 8, and a cable 9 is provided on the cable sealing end 8. A sealing nut 10 is provided between the cable 9 and the cable sealing end 8. The cable is used for communication between the camera and the host computer. Figure 2 and Figure 4 As shown, a lifting ring 12 is arranged inside the sleeve, and the core wire 11 of the cable is inside the lifting ring 12. The core wire 11 has a reserved length to ensure its freedom of movement. When the CCD camera moves, the core wire 11 moves inside the lifting ring to prevent the core wire from getting tangled.

[0032] Working principle: Taking two measuring points (measuring point one and measuring point two) as an example, the sealing sleeve 1 is fixed at measuring point one, and then the measuring rod 4 is pulled to measuring point two. During this process, the miniature camera 3 collects the coding information on the barcode scale 2 in real time. The specific measurement process is as follows:

[0033] After the displacement meter is powered on, the miniature camera 3 (CCD camera) acquires coded images in real time under infrared or visible light LED illumination. When the host computer issues a command to determine the start of the measurement, feature extraction and image matching are performed in real time. Then, the host computer calculates the geometric parameters and corrects the scale expansion coefficient in real time based on the temperature collected by the temperature sensor. After the calculation is completed, the displacement is output in real time.

[0034] This invention uses visual image processing based on a barcode scale for displacement measurement, eliminating problems such as nonlinear error compensation. With the support of sub-pixel feature extraction algorithms, it can achieve high-precision displacement measurement. Meanwhile, the sealing sleeve is sealed by a sealing ring and can withstand water pressure of 1.0 MPa, making it more suitable for field applications.

[0035] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A high-precision displacement meter based on barcode scales and CCD imaging principles, characterized in that: The device includes a sealing sleeve, a barcode scale disposed within the sealing sleeve, and a miniature camera. One end of the sealing sleeve is coaxially provided with a measuring rod that can slide along its axial direction. The miniature camera is disposed at the first end of the measuring rod, and the barcode scale is fixedly disposed within the sealing sleeve. The sealing sleeve is also equipped with an illumination device for illuminating the miniature camera; The miniature camera is electrically connected to the host computer.

2. The high-precision displacement meter based on barcode scale and CCD imaging principle according to claim 1, characterized in that: The miniature camera is a CCD camera.

3. The high-precision displacement meter based on barcode scale and CCD imaging principle according to claim 1, characterized in that: The barcode scale has a hybrid encoding of QR code and barcode.

4. The high-precision displacement meter based on barcode scale and CCD imaging principle according to claim 1, characterized in that: The first end of the measuring rod is provided with an L-shaped connecting plate, and the miniature camera is fixed on the connecting plate.

5. The high-precision displacement meter based on barcode scale and CCD imaging principle according to claim 4, characterized in that: The lighting device is a light-emitting diode, and the lighting device is mounted on the connecting plate.

6. The high-precision displacement meter based on barcode scale and CCD imaging principle according to claim 4, characterized in that: The second end of the measuring rod extends from the first end of the sealing sleeve, and a rod sealing end is provided between the second end of the measuring rod and the first end of the sealing sleeve.

7. The high-precision displacement meter based on barcode scale and CCD imaging principle according to claim 6, characterized in that: A Y-shaped sealing ring is provided between the sealing end of the pull rod and the pull rod.

8. The high-precision displacement meter based on barcode scale and CCD imaging principle according to claim 4, characterized in that: The second end of the sealing sleeve is provided with a cable sealing end, the cable sealing end is provided with a cable, and a sealing nut is provided between the cable and the cable sealing end.

9. The high-precision displacement meter based on barcode scale and CCD imaging principle according to claim 1, characterized in that: The barcode ruler is equipped with a temperature sensor for measuring the barcode ruler.

Images