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Heterodyne laser interference angle vibration measuring method

A technology of laser interference and measurement method, which is applied in measurement devices, measurement of ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the influence of non-stationary angular vibration measurement accuracy, low frequency range and accuracy, and difficulty in high-speed angular motion measurement large problems, to achieve good adaptability, high model demodulation resolution, and self-adaptive effects

Active Publication Date: 2014-12-03
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

[0004] The measurement of high-speed angular motion is difficult, and the frequency range and accuracy have not been high. The measurement accuracy of non-stationary angular vibration is even more affected, and its measurement calibration is more difficult.

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  • Heterodyne laser interference angle vibration measuring method
  • Heterodyne laser interference angle vibration measuring method
  • Heterodyne laser interference angle vibration measuring method

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Embodiment

[0035] A heterodyne laser interferometry angle measurement vibration device, its structure is as follows figure 1 As shown, the system mainly consists of a polarizing laser 1, a beam splitter 2, a rectangular prism 3, an acousto-optic modulator 4, a mirror 5, a mirror 6, a rectangular prism 7, a mirror 8, a mirror 9, a grating 10, an objective lens 12, Reflector 13, reflector 14, photoelectric converter 15, data acquisition system 16, electronic computer 17 and so on.

[0036] The polarized laser 1 emits a laser beam, which is split by the beam splitter 2 to form two paths, and one path is reflected by the rectangular prism 3, and then enters the acousto-optic modulator 4 and the frequency is shifted by f c , and then enter the grating 10 through the mirror 5 and the mirror 6, and the ±1st-order reflected beam generated by the grating converges to the objective lens 12 and interferes with another beam of light. The other path passes through rectangular prism 7, reflector 8, a...

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Abstract

The invention relates to a heterodyne laser interference angle vibration measuring device and method, and belongs to the technical field of photoelectric measurement. The device comprises a polarization laser (1), a spectroscope (2), a first right-angle prism (2), an acoustic-optical modulator (4), a first reflection mirror (5), a second reflection mirror (6), a second right-angle prism (7), a third reflection mirror (8), a fourth reflection mirror (9), a grating (10), a lens (12), a fifth reflection mirror (13), a sixth reflection mirror (14), a photoelectric converter (15), a data collecting system (16) and a computer (17). The heterodyne laser interference angle vibration measuring device and method is characterized in that a model segment smaller than a carrier cycle is used for digital frequency demodulation of a vibration laser Doppler signal waveform with a low signal-to-noise ratio and a non-stationary angle, and therefore an angular vibration velocity waveform and an angular vibration acceleration waveform are obtained.

Description

technical field [0001] The invention relates to a heterodyne laser interference angle vibration measurement 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 modul...

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张大鹏张大治
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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