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Device and method for measuring metal linear expansion coefficient based on multi-beam laser heterodyne second harmonic

A laser heterodyne and second harmonic technology, which is applied in the direction of measuring devices, material thermal expansion coefficients, optical devices, etc., can solve the problems of poor acquisition effect of laser difference frequency signals, slow signal processing operation speed, and low measurement accuracy.

Inactive Publication Date: 2013-04-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of low measurement accuracy caused by poor acquisition effect of laser difference frequency signal and slow operation speed of signal processing in the existing method of measuring metal linear expansion coefficient by using multi-beam laser heterodyne, the present invention provides a multi-beam based Device and method for measuring metal linear expansion coefficient of laser heterodyne second harmonic

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  • Device and method for measuring metal linear expansion coefficient based on multi-beam laser heterodyne second harmonic
  • Device and method for measuring metal linear expansion coefficient based on multi-beam laser heterodyne second harmonic
  • Device and method for measuring metal linear expansion coefficient based on multi-beam laser heterodyne second harmonic

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specific Embodiment approach 1

[0052] Specific implementation mode 1. Combination figure 1 Illustrate this specific embodiment, the measuring device based on the metal linear expansion coefficient of multi-beam laser heterodyne second harmonic, it comprises H 0 Solid-state laser 2, quarter-wave plate 12, vibrating mirror 13, first plane mirror 3, polarizing beam splitter PBS11, converging lens 10, thin glass plate 9, second plane mirror 6, metal rod 15 to be tested , electric furnace 14, photodetector 4 and signal processing system 5;

[0053] h 0 The linearly polarized light emitted by the solid-state laser 2 is reflected by the first plane mirror 3 and then enters the polarization beam splitter PBS11, and the light beam reflected by the polarization beam splitter PBS11 is transmitted by the quarter-wave plate 12 and then enters the galvanometer 13, the light beam reflected by the vibrating mirror 13 is sent to the polarizing beam splitter PBS11 after being transmitted by the quarter-wave plate 12 again,...

specific Embodiment approach 2

[0055] Embodiment 2. The difference between this embodiment and the metal linear expansion coefficient measuring device based on multi-beam laser heterodyne second harmonic described in Embodiment 1 is that the temperature controller 16 and the temperature acquisition device, the The temperature control signal input end of electric furnace 14 is connected with the temperature control signal output end of digital display temperature controller 16; 16 is connected to the temperature signal input terminal.

specific Embodiment approach 3

[0056] Embodiment 3. The difference between this embodiment and the measuring device for metal linear expansion coefficient based on multi-beam laser heterodyne second harmonic described in Embodiment 2 is that the temperature controller 16 is a digital display temperature controller.

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Abstract

The invention provides to a method for measuring metal linear expansion coefficient based on multi-beam laser heterodyne second harmonic, relating to a system and method for measuring metal linear expansion coefficient. In the invention, the problem of lower measuring accuracy caused by poor laser difference frequency signal acquisition effect and low signal processing operation speed in the existing methods for measuring the metal linear expansion coefficient is solved by adopting multi-beam laser heterodyne. A light frequency is added to the incident light signal at different moments by introducing a galvanometer to the light path, so that the light reflected by a plane mirror k times and k+2 times generates multi-beam heterodyne second harmonic signals under the condition of satisfying interference and successfully modulates the measured information into the frequency difference of the mid-frequency heterodyne second harmonic signals, thus computing the metal linear expansion coefficient. The device and the method are suitable for measurement of the metal linear expansion coefficient.

Description

technical field [0001] The invention relates to a system and a measuring method for measuring the linear expansion coefficient of metal. Background technique [0002] The thermal expansion properties of an object reflect the properties of the material itself, and the change in the length of a solid in one dimension after being heated is usually called linear expansion. Measuring the linear expansion coefficient of materials is not only of great significance to the development of new materials, but also one of the important indicators for selecting materials. The thermal expansion characteristics of materials must be considered in engineering structure design, machinery and instrument manufacturing, and material processing. Otherwise, it will affect the stability of the structure and the accuracy of the instrument. Improper consideration may even cause damage to the project, failure of the instrument, and defects and failures in processing and welding, etc. At present, the...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16G01B11/02
Inventor 李彦超王春晖高龙曲杨张峰
Owner HARBIN INST OF TECH