Experimental study of “Auto Sensor Test–Self Test Mode” for Acoustic Emission system performance verification

Finkel, Peter; Mitchell, James R.; Carlos, Mark F.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1995
Academic Journal
An important consideration in Acoustic Emission testing is the determination of the performance of the instrumentation prior to and after data acquisition. In an effort to satisfy this need, an electronic means has recently been developed. The technique, known as “Auto Sensor Test–Self Test Mode” (AST-STM) utilizes a voltage pulse to excite a sensor’s crystal and the structure to which the sensor is attached. After excitation, the sensor output is measured. Instrumentation performance, including efficiency of the coupling, can be determined by comparing the waveform duration and energy to minimum values established using a sensor and instrumentation channel that is known to be operating properly on the same structure. The AST-STM technique is compared with the pencil lead break technique for a variety of sensor frequencies, couplant types, couplant efficiency factors, structural geometries and plate thicknesses. © 2000 American Institute of Physics.


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