Application of Phase-Sensitivity Detector in Air-Coupled Ultrasonic Testing

Abstract:

The signal to noise ration of air-coupled ultrasonic testing is very poor and there is long time pulse residue, so it need adopt appropriate signal processing method to enhancing the SNR of received signal. Factors, which affect the received signal in ultrasonic testing process, is analyzed, phase sensitivity detection technology is presented to process the received signal, and ultrasonic testing information can be acquired by the calculation of phase signal. The principle of super-heterodyne receiver and phase sensitivity detector is introduced; some problem which should be pay attention in ultrasonic testing process is explained. Based on the research result, air-coupled ultrasonic testing system with phase sensitivity detector is constituted. Experiment results of image testing on carbon fiber reinforced plastic plate indicated that, phase sensitivity detection technology can improved signal to noise ratio of system and testing effect in evidence.

• Periodical: Applied Mechanics and Materials (Volumes 170-173)
• Pages: 3125-3129
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.170-173.3125
• Online since: May 2012
• Authors: Wei Dong, Zi Wei Zhou, Zheng Gan Zhou
• Keywords: Air-Coupled Ultrasonic, Phase-Sensitivity Detector, Super-Heterodyne Receiver, Ultrasonic Imaging

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