ASTM E 1781 - 98. Standard Practice for Secondary Calibration of Acoustic Emission Sensors

American Society for Testing and Materials (ASTM). 1998, 7 pages.
This practice covers requirements for the secondary calibration of acoustic emission (AE) sensors. The secondary
calibration yields the frequency response of a sensor to waves of the type normally encountered in acoustic emission work.
The source producing the signal used for the calibration is mounted on the same surface of the test block as the sensor
under testing (SUT). Rayleigh waves are dominant under these conditions; the calibration results represent primarily the sensor’s
sensitivity to Rayleigh waves. The sensitivity of the sensor is determined for excitation within the range of 100 kHz
to 1 MHz. Sensitivity values are usually determined at frequencies approximately 10 kHz apart. The units of the calibration
are volts per unit of mechanical input (displacement, velocity, or acceleration).