Measuring device and method for measuring coefficient of metal linear expansion by Doppler vibration lens sine modulation multi-beam laser heterodyning secondary harmonics

A Doppler galvanometer and sinusoidal modulation technology, applied in measurement devices, optical devices, thermal expansion coefficients of materials, etc., can solve the problems of poor laser signal quality and signal processing operation speed, and achieve simple structure and high precision. high effect

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

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Problems solved by technology

[0005] In order to solve the problem that the quality of the collected laser difference frequency signal and the operation speed of signal processing are not ideal when the existing laser heterodyne measurement method mea...

Method used

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  • Measuring device and method for measuring coefficient of metal linear expansion by Doppler vibration lens sine modulation multi-beam laser heterodyning secondary harmonics
  • Measuring device and method for measuring coefficient of metal linear expansion by Doppler vibration lens sine modulation multi-beam laser heterodyning secondary harmonics
  • Measuring device and method for measuring coefficient of metal linear expansion by Doppler vibration lens sine modulation multi-beam laser heterodyning secondary harmonics

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specific Embodiment approach 1

[0019] Specific implementation mode one: combine figure 1 Describe the present embodiment, the measuring device of the Doppler vibrating mirror sinusoidal modulation multi-beam laser heterodyne second harmonic measurement metal linear expansion coefficient described in the present embodiment, it comprises H0 solid-state laser 2, quarter-wave plate 12, Galvanometer 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;

[0020] The linearly polarized light emitted by the H0 solid-state laser 2 is reflected by the first plane reflector 3 and then enters the polarizing beam splitter PBS11, and the light beam reflected by the polarizing beam splitting mirror PBS11 is transmitted by the quarter-wave plate 12 and then enters the vibrating beam. The light receiving surface of the mirror 13, the light beam reflected by the o...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is that it also increases the temperature controller 16 and the temperature acquisition device, the temperature control signal input end of the electric furnace 14 and the temperature control of the digital display temperature controller 16 The signal output end is connected; the temperature acquisition device collects 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 . Other compositions and connection methods are the same as those in Embodiment 1.

specific Embodiment approach 3

[0023] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the temperature controller 16 is a digital display temperature controller. Other compositions and connection methods are the same as those in the second embodiment.

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Abstract

The invention relates to a measuring device and a measuring method for measuring a coefficient of metal linear expansion by Doppler vibration lens sine modulation multi-beam laser heterodyning secondary harmonics, and relates to a measuring device and a measuring method for measuring the coefficient of metal linear expansion. The measuring device and the method aim to solve the problem that the quality of collected laser difference frequency signals and the computing speed of signal processing are nonideal in the process of measuring the coefficients of metal linear expansion by the conventional laser heterodyning measuring method. The measuring device comprises the following steps of: making a reflective surface of a second planar reflector parallel to a thin glass plate mutually; heating a metal rod to be measured uniformly, and opening an H0 solid laser simultaneously; and collecting the temperature inside an electrothermal furnace to acquire temperature variable quantity, collecting electric signals outputted by a photoelectric detector continuously by a signal processing system to acquire distance variable quantity between the second planar reflector and the thin glass plate,and acquiring the coefficient of metal linear expansion. The measuring device and the measuring method have the advantages of high quality of the collected laser difference frequency signals and highcomputing speed of the signal processing.

Description

technical field [0001] The invention relates to a measuring device and 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. If it is not considered properly, it may even cause damage to the project, malfunction of the instrument, and defects and failures in processing and welding. At pr...

Claims

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Application Information

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IPC IPC(8): G01N25/16G01B11/02
Inventor 王春晖李彦超
Owner HARBIN INST OF TECH
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