Real-time monitoring variable temperature and pressure type laser speckle measuring system

A technology of laser speckle and real-time monitoring, which is applied in the direction of measuring devices, optical testing flaws/defects, and optical devices, etc. It can solve the problems of uncontrollable heating degree, uneven force on samples, and material limitations, etc., and achieve the convenience of large-scale The effect of manufacturing and promotion, low cost, and easy placement of samples

Active Publication Date: 2014-04-30
SHENYANG NORMAL UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a laser speckle measuring instrument heating measurement system, which aims to solve the problem that the existing eddy current heating will affect the measured displacement, strain, surface defects and cracks of the sample when the laser speckle The sample material is limited, the degree of heating cannot be controlled, and the uneven force of the sample causes measurement errors and other problems

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  • Real-time monitoring variable temperature and pressure type laser speckle measuring system
  • Real-time monitoring variable temperature and pressure type laser speckle measuring system
  • Real-time monitoring variable temperature and pressure type laser speckle measuring system

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[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] Such as figure 1 As shown, a real-time monitoring variable temperature and variable pressure laser speckle measurement system includes a fixture for fixing the sample and receiving laser signals. Cement resistors 3 are arranged around the sample on the fixture for heating the sample. , the fixing device includes a bottom plate 10 engraved with a parallel chute 6, a fixing plate 2 with a light transmission hole 4 at the center, and a baffle 7 with a screw hole 12 at the center, the fixing plate 2 and the baffle 7 Sliders 13 that match the structure of the chute 6 are respectively provided. T...

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Abstract

The invention provides a real-time monitoring variable temperature and pressure type laser speckle measuring system which comprises a fixing device. The fixing device is used for fixing a sample and receiving laser signals. Cement resistors are arranged around the sample on the fixing device and are used for heating the sampler. The system comprises a control unit which comprises a CPU control unit, a temperature collecting system which is connected with the input end of the CPU control unit, a key, a digital display unit and a temperature control module, wherein the digital display unit and the temperature control module are connected with the output end of the CPU control unit. The temperature sensor is used for measuring the temperature of the sample and transmitting the temperature to the CPU control unit, after the CPU control unit collects the temperature, PID operation is conducted on the temperature and the set value input by the key, pulse width modulation signals are output, the pulse width modulation signals control a power field-effect transistor of the temperature control module to change the voltages of the cement resistors, and temperature control is achieved.

Description

technical field [0001] The invention belongs to the technical field of laser interference nondestructive testing, and in particular relates to a real-time monitoring variable temperature variable pressure laser speckle measurement system. Background technique [0002] Laser speckle interferometry (ESPI) technology is a non-contact full-field real-time measurement technology, which has achieved rapid development in recent years because of its strong versatility, high measurement accuracy, wide frequency range and easy measurement. Laser speckle interference non-destructive testing technology can complete various tests such as displacement, strain, surface defects and cracks. It is also an important experimental course offered in the undergraduate teaching experiments of optics and optoelectronics in most universities, but the existing laser speckle measurement experiment system has shortcomings: the material measurement rack can only be used to place samples with a single sha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01B11/16G01N21/88
Inventor 陈秀艳邓玉福李鑫田宇辰李乾华
Owner SHENYANG NORMAL UNIV
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