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A Demodulation Device for Simultaneously Obtaining Amplitude and Phase of Vibration Signals

A technology of vibration signal and demodulation device, which is applied in the field of laser detection and can solve problems such as inability to obtain phase information

Active Publication Date: 2021-09-24
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, modal analysis needs to obtain the amplitude and phase of the vibration signal at the same time, while the laser heterodyne Doppler vibration measurement technology can only obtain the amplitude of the vibration signal, but cannot obtain the phase information

Method used

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  • A Demodulation Device for Simultaneously Obtaining Amplitude and Phase of Vibration Signals

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Embodiment Construction

[0015] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0016] see figure 1 , which is a functional block diagram of a demodulation device that simultaneously acquires the amplitude and phase of a vibration signal provided by this embodiment. A demodulation device for obtaining the amplitude and phase of vibration signals at the same time, which is applied to piezoelectric measured objects, and specifically includes a heterodyne Doppler interference optical module 1, an avalanche photodetector 2, an excitation signal source 4, and a dual-channel data Acquisition card 5 and processing module 6;

[0017] The excitation signal source 4 is used to generate an excitation signal;

[0018] The piezoelectric measured object 3 is u...

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Abstract

The invention provides a demodulation device for obtaining the amplitude and phase of the vibration signal at the same time. The interference signal containing the amplitude and phase information of the vibration of the piezoelectric measured object is obtained through the heterodyne Doppler interference optical module, and then through the positive Operations such as cross-demodulation and Hilberg transform extract the amplitude and phase of the vibration signal; it can be seen that the present invention only needs to collect the excitation signal instead of the quadrature signal of the excitation signal, and can obtain the vibration signal at the same time. Magnitude and phase, available for sinusoidally excited modal analysis.

Description

technical field [0001] The invention belongs to the technical field of laser detection, in particular to a demodulation device for simultaneously acquiring the amplitude and phase of a vibration signal. Background technique [0002] Due to its non-contact, high precision and high signal-to-noise ratio, laser heterodyne Doppler vibration measurement technology has attracted more and more attention. Modal analysis is a method to study the dynamic characteristics of structures. The combination of the two can be used for structural Design, non-destructive testing, failure analysis, etc., have broad application prospects in fields including aerospace vehicles, industrial production, and scientific research. However, modal analysis needs to obtain the amplitude and phase of the vibration signal at the same time, while the laser heterodyne Doppler vibrometer technique can only obtain the amplitude of the vibration signal, but cannot obtain the phase information. Contents of the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00G01B9/02
CPCG01B9/02029G01B9/02045G01H9/00
Inventor 舒风风王凯旋刘永顺迟明波王越吴一辉
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI