Spatial displacement and strain measurement device and method based on CCD camera

Abstract

The invention discloses a spatial displacement and strain measurement device and method based on a CCD camera. The spatial displacement and strain measurement device comprises the CCD color camera, afirst spectroscope, a second spectroscope, a first reflector, a second reflector and a third reflector; the first reflector, the first spectroscope and the second spectroscope constitute a first lightpath, the second reflector and the first spectroscope constitute a second light path, and the third reflector, the second spectroscope and the first spectroscope constitute a third light path; the first light path, the second light path and the third light path all enter the CCD color camera; and the CCD color camera is used for conducting shooting through the first light path, the second light path and the third light path. The spatial displacement and strain measurement device is simple in structure, no synchronous trigger device is required for synchronous data acquisition, equivalently, shooting is conducted from three directions with three CCD cameras, thus the calculation result is more accurate, the limitation on the shape of the surface of a to-be-measured object is avoided, and application is flexible.

Description

technical field [0001] The invention relates to the field of optical measurement, in particular to a CCD camera-based spatial displacement and strain measurement device and method. Background technique [0002] Since the advent of the digital image correlation method in 1980, the method has been developed rapidly. In order to measure spatial displacement and strain, some scholars have proposed a spatial digital image correlation method. This method has many advantages, such as: full field, high precision, non-contact and insensitivity to the measurement environment, etc., so that this method has been applied in many fields of displacement and strain measurement. The traditional spatial digital image correlation needs to use two CCD cameras, which not only makes the hardware cost high, but also needs to provide a synchronous trigger device in order to realize the simultaneous operation of the two cameras, which makes the operation complicated. [0003] At present, the inven...

AI Technical Summary

Problems solved by technology

Traditional spatial digital image correlation requires two CCD cameras, which not only makes the hardware cost high, but also provides a synchronous trigger device in order to realize the simultaneous operation of the two cameras, which makes the operation more complex

[0003] At present, the invention patent with the publication number CN103940357A discloses a non-contact spatial displacement measuring device, which includes a laser range finder arranged at the reference point, an imaging transparent plate arranged at the detection point, and an imaging transparent plate arranged on the imaging transparent plate. For the image acquisition device, drive module, and control module on the side of the laser rangefinder, the above-mentioned measuring device has the following disadvantages: 1. The laser rangefinder is expensive, bulky, and inconvenient to carry; 2. There is only one optical path to the sensor during shooting , which may result in missing reference point information

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