System and method for testing acoustic emission sensor based on laser Doppler principle

An acoustic emission sensor, laser Doppler technology, applied in instruments, measuring devices, scientific instruments, etc., can solve the problems of inconvenient operation and difficult to achieve traceability

Inactive Publication Date: 2011-06-15
NAT INST OF METROLOGY CHINA
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Problems solved by technology

[0006] In order to solve the problems of inconvenient operation and difficult traceability of the surface wave pulse method in the prior ar

Method used

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  • System and method for testing acoustic emission sensor based on laser Doppler principle
  • System and method for testing acoustic emission sensor based on laser Doppler principle
  • System and method for testing acoustic emission sensor based on laser Doppler principle

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Embodiment Construction

[0039] The invention utilizes the inverse piezoelectric effect, and adopts piezoelectric transducers as sound emitting sources. The broadband emission transducer is coupled to one end of an optical glass test block with a certain thickness, and the longitudinal wave generated by the transducer will be measured at the other end of the test block, which is coated with a high reflection film. The first measurement is completed by the laser Doppler single-point vibration measurement unit, and then the acoustic emission signal at the coating is detected by the acoustic emission sensor to be tested. Compared with the two received waveforms, the sensitivity curve of the acoustic emission sensor can be obtained by a The frequency function is given.

[0040] The laser Doppler single-point vibrometer unit consists of optical devices including helium-neon laser tubes, beam splitters, prisms, focusing mirrors, quarter-wave plates, half-wave plates, modulation crystals driven by belts, and...

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Abstract

The invention belongs to the field of test, measurement and calibration of sensors, and in particular relates to a system and a method for testing the sensitivity of an acoustic emission sensor. A system for testing the acoustic emission sensor based on a laser Doppler principle is used for testing the sensitivity of the acoustic emission sensor; and a sensitivity curve of the acoustic emission sensor is obtained according to a voltage spectrum and a velocity spectrum of the acoustic emission sensor which are measured by the system; and the displacement or displacement velocity of acoustic emission elastic waves is directly measured, accuracy of dozens of picometers can be achieved, the measured physical quantity can be traced to the source of time frequency, and a high-accuracy method is provided for testing the sensitivity of the acoustic emission sensor.

Description

technical field [0001] The invention belongs to the field of measuring and calibrating sensors, and in particular relates to a system and a method for testing the sensitivity of an acoustic emission sensor, especially based on laser Doppler technology. Background technique [0002] The phenomenon that a local source in a material releases energy rapidly to generate a transient elastic wave is called Acoustic Emission (AE for short). In the application of acoustic emission technology, the operating frequency band and sensitivity of the sensor play a decisive role in the results of AE detection. Most AE sensors in practical applications are resonant piezoelectric transducers. The sensitivity of the acoustic emission sensor is expressed in the form of displacement sensitivity or velocity sensitivity. How to test its frequency response is the bottleneck of the wide application of AE quantitative technology. [0003] In the prior art, the method recommended by ASTM and ISO is t...

Claims

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Application Information

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IPC IPC(8): G01N29/30
Inventor 何龙标杨平钟波牛锋
Owner NAT INST OF METROLOGY CHINA
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