Device and method for measuring metal linear expansion coefficient by adopting Doppler galvanometer sine modulated multi-beam laser heterodyne

A technology of Doppler galvanometer and laser heterodyne, which is applied in the direction of measuring device, optical device, material thermal expansion coefficient, etc., can solve the problem of single measurement accuracy and so on

Inactive Publication Date: 2011-11-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low measurement accuracy due to the low measurement accuracy of the thermal expansion coefficient of the object measured by the tradit

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  • Device and method for measuring metal linear expansion coefficient by adopting Doppler galvanometer sine modulated multi-beam laser heterodyne
  • Device and method for measuring metal linear expansion coefficient by adopting Doppler galvanometer sine modulated multi-beam laser heterodyne
  • Device and method for measuring metal linear expansion coefficient by adopting Doppler galvanometer sine modulated multi-beam laser heterodyne

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specific Embodiment approach 1

[0069] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the Doppler vibrating mirror sinusoidal modulation multi-beam laser heterodyne measurement device for metal linear expansion coefficient described in this embodiment, the device consists of 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 , an electric furnace 14, a photodetector 4 and a signal processing system 5;

[0070] 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 sp...

specific Embodiment approach 2

[0076] Specific embodiment two: this embodiment is a further explanation to embodiment one, and it also comprises temperature controller 16 and temperature acquisition device, the temperature control signal input terminal of described electric furnace 14 and the temperature control signal output of temperature controller 16 The temperature acquisition device is used to collect the temperature of the metal rod 15 to be measured, and the temperature signal output end of the temperature acquisition device is connected with the temperature signal input end of the temperature controller 16.

specific Embodiment approach 3

[0077] Embodiment 3: This embodiment is a further description of Embodiment 2, and the temperature controller 16 is a digital display temperature controller.

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Abstract

The invention provides a device and method for measuring metal linear expansion coefficient by adopting Doppler galvanometer sine modulated multi-beam laser heterodyne, belonging to the technical field of metal linear expansion coefficient measurement. The invention aims to solve the problem that the measuring accuracy is low because only the single measured parameter value can be obtained in thetraditional methods for measuring the thermal expansion coefficients of the objects by adopting heterodyne interferometry. The device comprises an H0 solid laser, a quarter waveplate, a galvanometer,a first plane mirror, a polarizing beam splitter (PBS), a convergent lens, a thin glass plate, a second plane mirror, a metal rod to be measured, an electric heating furnace, a photoelectric detectorand a signal processing system. The method is characterized by ensuring the reflecting surface of the second plane mirror to be parallel with the thin glass plate through adjustment, adopting the electric heating furnace to uniformly heat the metal rod to be measured, opening the galvanometer and the H0 solid laser, adopting the signal processing system to acquire the electrical signal output by the photoelectric detector and processing the acquired signal to obtain 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 device and method for measuring metal linear expansion coefficient by sinusoidally modulating multi-beam laser heterodyne with a Doppler vibrating mirror, and belongs to the technical field of metal linear expansion coefficient measurement. 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. Imprope...

Claims

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Application Information

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IPC IPC(8): G01N25/16G01B11/16
Inventor 李彦超王春晖高龙曲杨丛海芳邵文冕
Owner HARBIN INST OF TECH
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