A method and device for calibrating an image method displacement measuring instrument

Abstract

The invention provides a method and device for calibrating an image method displacement measuring instrument and belongs to bridge deflection detection instrument industry standards and verification regulations. The device comprises a motor controller, transmission modules consisting of motors and shafts, a recording tape control module, a light source conversion module, a controller, a recording tape and a light source. The three transmission modules and the recording tape control module are arranged at four corners of a rectangle; the recording tape control module comprises a recording tape incoming module consisting of a motor and a shaft and a recording tape outgoing module consisting of a motor and a shaft, wherein the recording tape incoming module and the recording tape outgoing module rotate in opposite directions; the recording tape is wound around the shafts of the recording tape incoming module and the recording tape outgoing module; the controller controls on / off of the light source; the motors are controlled to drive the shafts to rotate; the recording tape control module and the three transmission modules work cooperatively. The method and the device can be used for calibration of dynamic measurement properties of an image method displacement measuring instrument and have the advantages of great controllability, accurate displacement and controllable displacement speed.

Description

technical field [0001] The invention belongs to the technical field of instrument measurement. Background technique [0002] Digital image technology has entered an era of rapid development since the end of the 20th century. The image method is also used in various industries. It has become an important non-contact measurement method in the field of displacement measurement, which can avoid the problems faced by traditional contact methods. Difficult, with high precision, easy to use and so on. [0003] With the rapid development of China's economy, the construction volume of roads, bridges and tunnels is increasing day by day, and the types of road and bridge engineering testing equipment are also increasing. Among road and bridge engineering inspection equipment, many equipment use the image method to measure the displacement. The calibration of such equipment is an important link related to the measurement accuracy of the equipment. [0004] At present, there are two m...

AI Technical Summary

Problems solved by technology

[0014] 1) Cannot be calibrated accurately

Using the standard plate can only calibrate the resolution, the actual calibration content is the performance of the imaging unit (CCD or CMOS), and cannot calibrate the performance of the instrument in dynamic measurement such as instrument response speed and data processing accuracy

[0015] 2) Expensive

Calibration is carried out by using the motor to drive the mobile platform, which has extremely high requirements on the accuracy and response speed of the motor and lead screw, which is expensive

[0016] 3) Poor controllability

Calibration is carried out by using the motor to drive the mobile platform, its displacement and moving speed are difficult to control, and the repeatability of the device is difficult to meet the requirements

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