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Photoelectric multichannel communicating pipe liquid level bridge deflection measuring device and method

A bridge deflection and measurement device technology, which is applied in the direction of measurement devices, liquid/fluid solid measurement, lubrication indicator devices, etc., can solve the problems of low accuracy of the deflection detection system, disappearance of liquid level edge lines, and susceptibility to environmental interference, etc. Achieve the effect of convenient installation, improved accuracy and high real-time performance

Active Publication Date: 2021-06-25
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a more accurate photoelectric sensor that can improve the disappearance of the edge line of the liquid level in order to overcome the defects of the deflection detection system in the prior art, such as low accuracy, low real-time performance, and susceptibility to environmental interference. Device and method for measuring deflection of liquid level bridge with multi-channel connecting pipe

Method used

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  • Photoelectric multichannel communicating pipe liquid level bridge deflection measuring device and method
  • Photoelectric multichannel communicating pipe liquid level bridge deflection measuring device and method
  • Photoelectric multichannel communicating pipe liquid level bridge deflection measuring device and method

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Experimental program
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Effect test

Embodiment 1

[0049] A photoelectric multi-channel connecting pipe liquid level bridge deflection measuring device, such as figure 1 As shown, it includes a base 2, a fixed plate 1, a power supply 10, a light source 5, a horizontal connecting pipe 7, a liquid level observation pipe 3, a connecting pipe joint 4, a diffuser plate 6, a visual sensor 8, and a digital processing unit 9;

[0050] The light source 5 used in this embodiment is a bar-shaped light source and is a white light source; the fixed plate 1 has a plurality of horizontal chutes, which are used to adjust the shooting distance and height, and adapt to different measurement ranges; the digital processing unit 9 is a computer;

[0051] The plane where the base 2 is located is a horizontal plane, the fixed plate 1 is vertically installed on the base 2, and the horizontal connecting pipe 7 is a connecting pipe parallel to the base 2 and connected from the outside. The joint 4 is connected with two liquid level observation tubes 3,...

Embodiment 2

[0060] A device and method for calibrating a photoelectric multi-channel communication pipe liquid level bridge deflection measuring device constructed in Example 1, such as Figure 5 As shown, prepare lifting slide table, laser displacement meter 20, laser baffle 22, digital-analog acquisition card 21; and light source 5, astigmatism plate 6, liquid level observation tube 3, visual sensor 8, digital processing unit 9, power supply 10 all Same as embodiment 1;

[0061] In the application of bridge deflection measurement, a measurement accuracy of 0.1 mm can meet the measurement requirements. The accuracy of the laser displacement meter used in this embodiment is at the micron level, which can meet the calibration requirements with higher accuracy.

[0062] The calibration method includes the following steps,

[0063] S21, fix the liquid level of the liquid level observation tube 3 so that the liquid level is on the same level as the reference position of embodiment 1, and the...

Embodiment 3

[0072] After the calibration method described in Example 2 is used to calibrate the photoelectric multi-channel communication pipe liquid level bridge deflection measurement device constructed in Example 1, the device and method for verifying and calibrating the calibration results, such as Figure 6 As shown, prepare horizontal fixed plate 12, syringe, ball screw, stepper motor 16, pipe channel sealing interface 15, conduit 14; there is a cavity in the described tube channel sealing interface 15; light source 5, astigmatism plate 6, visual sensor 8. The digital processing unit and the power supply are the same as in Embodiment 1; the bottom of the liquid level observation tube 3 does not need to be connected to the horizontal connecting pipe 7, but to take over the channel sealing interface 15;

[0073] The method of verification and calibration includes the following steps:

[0074] S31, fix the position of the visual sensor at the reference position in embodiment 1, inject ...

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Abstract

The invention discloses a photoelectric multichannel communicating pipe liquid level bridge deflection measuring device and method. The device comprises a power supply, a light source, a liquid level observation pipe, a light scattering plate, a visual sensor and a digital processing unit. The light scattering plate is provided with a light transmitting sheet, and the light transmittance of the light transmitting sheet is not higher than 80%; and light emitted by the light source penetrates through the light scattering plate, the light transmitting sheet and the liquid level observation pipe to reach the visual sensor, and the visual sensor is connected with the digital processing unit and used for transmitting collected liquid level images to the digital processing unit. The method comprises the steps that calibration, accuracy verification, calibration and measurement are carried out on the measuring device, during calibration, a function relational expression of image liquid level edge coordinates and a displacement difference is constructed, and during measurement, after the visual sensor captures a liquid level picture of the liquid level observation pipe, liquid level image information is collected in real time and transmitted to the digital processing unit to be processed and calculated, and liquid level height information is obtained. An edge detection success rate is higher, and the measurement accuracy is better.

Description

technical field [0001] The invention relates to the technical field of bridge detection and monitoring, in particular to a photoelectric multi-channel communication pipe liquid level bridge deflection measuring device and method. Background technique [0002] How to ensure the safe operation of bridges has always been a matter of great concern to management departments, and deflection is one of the important parameters for evaluating bridge safety conditions. Bridge deflection refers to the vertical deformation of the bridge at different positions under load, which directly reflects the overall vertical stiffness of the bridge structure. The measurement of the connecting pipe is to use the principle of the liquid level in the pipe to lay the connecting pipe along the beam body, and record the change of the liquid level in the connecting pipe through measurement, so as to convert the change of the bridge deflection, and the accurate measurement of the liquid level is the key....

Claims

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Application Information

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IPC IPC(8): G01M5/00G01F23/02
CPCG01M5/0008G01M5/0075G01F23/02
Inventor 倪文波刘昕宇晋智斌王雪梅
Owner SOUTHWEST JIAOTONG UNIV
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