Abstract：The calibration of acoustic emission (AE) sensors is the premise of achieving acoustic emission quantitative testing technology. In view of electro - acoustic transducer reciprocity principle, the reciprocal constant is calculated to establish a calibration system that applies to the reciprocity of piezoelectric AE sensor Rayleigh wave and longitudinal wave. With specific excitation signal waveform, in accordance with the time delay between the received voltage signal and the excitation current signal, the characteristic values of both signals could be captured accurately. Because of the aperture effect of the sensor, the velocity sensitivity of surface waves is lower than that of longitudinal waves while the sensor operates in high frequency. The uncertainty of reciprocity calibration on the velocity sensitivity of acoustic emission sensors is about 1. 2 dB.
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