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Heterodyne laser vibration measuring device and method

A technology of laser vibration measurement and heterodyning, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as non-stationary, unable to demodulate correctness, etc., to achieve improved accuracy, good adaptability, The effect of absolute convergence of the algorithm

Active Publication Date: 2015-01-07
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0004] When the carrier signal is relatively regular and stable, and the signal-to-noise ratio is high, there are many modulation and demodulation theories, methods and technologies that can be used. The demodulation of this type of signal poses a huge challenge to people when it has characteristics such as non-stationary, and in many cases the correct result cannot be demodulated

Method used

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  • Heterodyne laser vibration measuring device and method
  • Heterodyne laser vibration measuring device and method
  • Heterodyne laser vibration measuring device and method

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Embodiment

[0032] A heterodyne laser vibration measuring device, its structure is as follows figure 1 As shown, the system is mainly composed of a frequency-stabilized laser 1, a polarizer 2, a beam splitter 3, a frequency shifter 4, a mirror 5, half-mirrors 6 and 7, a vibrating object to be measured 8, a photoelectric converter 9, and data acquisition System 10, electronic computer 11 etc. are formed.

[0033] The frequency-stabilized laser light emitted by the frequency-stabilized laser 1 is divided into two by the polarizer 2 and the beam splitter 3, and all the way through the frequency shifter 4 to shift the frequency f c Afterwards, it passes through the reflector 5, passes through the half-mirror 6 and interferes with another beam combination and enters the photoelectric converter 9 for reception. The other path passes through the half-mirror 7 and enters the surface of the vibrating object 8, and returns after being reflected by the vibrating surface. After being reflected by th...

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Abstract

The invention relates to a heterodyne laser vibration measuring device and method and belongs to the technical field of photoelectric measurement. The method includes: using the heterodyne laser vibration measuring device to obtain a vibration laser Doppler signal waveform with frequency being translated to a radio frequency range; using a waveform data acquisition system to acquire a vibration laser Doppler signal waveform data sequence; intercepting a waveform section of a carrier cycle at the front edge of the vibration laser Doppler signal waveform data sequence; performing sine fitting to the waveform section to obtain instant frequency of a fit sine wave; translationally sliding the waveform section by one sampling point for sine fitting so as to obtain instant frequency of a fit sine wave; repeating sliding fitting until the end point of the data sequence.

Description

technical field [0001] The invention relates to a heterodyne laser vibration measuring device and method, belonging to the technical field of photoelectric measurement. Background technique [0002] Modulation domain measurement is to make the measured physical quantity modulate another physical quantity (such as sound wave, light wave, electromagnetic wave, etc.), and then use modulation domain measurement technology to demodulate it from the modulated signal waveform. It is the modulation domain Basic functions in measurement. [0003] Because the Doppler effect of motion itself produces a frequency modulation phenomenon, and the corresponding measurement can be attributed to the non-contact and modulation domain measurement with indirect measurement characteristics, so the analysis and acquisition of the transient process of the actual physical quantity can be done. It is called the analysis and processing process of the transient signal in the modulation domain. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
Inventor 梁志国朱振宇李新良李强张大鹏
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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