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A Method for Measuring Linear Expansion Coefficient of Metal by Linear Frequency Modulation Multi-beam Laser Heterodyne

A technology of linear frequency modulation and laser heterodyne, applied in the direction of material thermal expansion coefficient, etc., can solve the problems of large measurement error, many directly measured parameters, complicated operation, etc., and achieve the effect of convenient operation, low power consumption and good repeatability

Inactive Publication Date: 2017-10-10
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the problem that many parameters need to be directly measured and the operation is complicated in the existing linear expansion coefficient measurement method, so that the measurement error is too large, and now provides a method for linear frequency modulation multi-beam laser heterodyne measurement of metal linear expansion coefficient

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  • A Method for Measuring Linear Expansion Coefficient of Metal by Linear Frequency Modulation Multi-beam Laser Heterodyne
  • A Method for Measuring Linear Expansion Coefficient of Metal by Linear Frequency Modulation Multi-beam Laser Heterodyne
  • A Method for Measuring Linear Expansion Coefficient of Metal by Linear Frequency Modulation Multi-beam Laser Heterodyne

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specific Embodiment approach 1

[0028] Specific implementation mode one: refer to figure 1 and figure 2 Specifically illustrate this embodiment, the chirped multi-beam laser heterodyne device for measuring metal linear expansion coefficient described in this embodiment, it comprises: chirp laser 1, thin glass plate 2, No. 1 plane reflector 3, electric heating furnace 4 , temperature controller 6, converging lens 7 and photodetector 8;

[0029] The chirp laser output by the chirp laser 1 is incident on the front surface of the thin glass plate 2, and the incident angle θ 0 is an acute angle, the thin glass plate 2 splits the laser beam into No. 1 reflected light and refracted light, the thin glass plate 2 reflects the No. 1 reflected light to the converging lens 7, and the thin glass plate 2 refracts the refracted light to a On the No. 1 plane reflector 3, the rear surface of the No. 1 plane reflector 3 and the thin glass plate 2 reflects the refracted light multiple times to obtain multiple beams of No. 2...

specific Embodiment approach 2

[0033] Specific implementation mode two: refer to image 3 This embodiment is described in detail. This embodiment is a further description of the device for measuring the linear expansion coefficient of metal with linear frequency modulation multi-beam laser heterodyne described in the first embodiment. In this embodiment, it also includes: a data processing system 9;

[0034] The electrical signal output end of photodetector 8 is connected to the electrical signal input end of data processing system 9; The module that software realizes is embedded in described data processing system 9, and described module comprises following unit:

[0035] A signal acquisition unit that collects the photocurrent I output by the photodetector 8;

[0036] Filter the photocurrent I to obtain the intermediate frequency current I IF filter unit;

[0037] Using intermediate frequency current I IF Obtain the frequency f of the interference signal p unit;

[0038] Using the frequency f of the ...

specific Embodiment approach 3

[0041] Specific implementation mode three: refer to Figure 4 This embodiment is described in detail. This embodiment is a further description of the device for measuring the linear expansion coefficient of metal with linear frequency modulation multi-beam laser heterodyne described in the first embodiment. In this embodiment, it also includes: filter 9-1 , amplifier 9-2, A / D converter 9-3 and DSP 9-4;

[0042] The electrical signal output end of the photodetector 8 is connected to the electrical signal input end of the filter 9-1, the electrical signal output end of the filter 9-1 is connected to the electrical signal input end of the amplifier 9-2, and the electrical signal output of the amplifier 9-2 Connect the analog signal input end of A / D converter 9-3, the digital signal output end of A / D converter 9-3 connects the digital signal input end of DSP9-4;

[0043] A module implemented by software is embedded in the DSP9-4, and the module includes the following units:

[0...

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Abstract

The invention relates to a device and a method for measuring a linear expansion coefficient of metal by virtue of a linear-frequency-modulation multi-beam laser heterodyne, belonging to the field of the measurement of linear expansion coefficients of materials and solving the problem that measuring errors are too large because more parameters need to be directly measured and the operation is complex in an existing linear expansion coefficient measuring method. According to the device and the method, to-be-measured parameter information is modulated into the frequency difference of heterodyne signals by virtue of a linear frequency modulation technique based on the linear frequency modulation and a laser heterodyne technique, a plurality of to-be-measured parameters can be simultaneously obtained by demodulating the laser heterodyne signals, and the accurate information of the to-be-measured parameters is obtained by virtue of weighted average treatment. The device and the method are applied to ultra-precise measurement, detection, processing equipment, laser radar systems and the like; an experimental phenomenon is obvious, and the experimental data is reliable; the device and the method are particularly applied to engineering design fields of coherence laser wind-finding radars and the like.

Description

technical field [0001] The invention belongs to the field of linear expansion coefficient measurement of materials. 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, there are measurement me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16
Inventor 李彦超沈中辉甄佳奇杨九如高扬冉玲苓杨瑞海杜军丁群王春晖马立峰
Owner HEILONGJIANG UNIV