Abstract
An ultrasonic displacement sensor is currently being investigated. A possible application for this sensor is acoustic/seismic landmine detection in which a noncontact vibrometer is employed to measure the normal surface velocity of soil. The ultrasonic sensor is an alternative displacement sensor to a laser Doppler vibrometer (LDV). The ultrasonic wavelength suggests that the ultrasonic sensor is capable of resolving displacements in the presence of rough surfaces. This functionality is of particular interest because scattering of optical signals by rough surfaces can prohibit accurate LDV measurements. The ultrasonic sensor will be evaluated in an array of surface roughness conditions. The performance of the ultrasonic sensor will be compared to the LDV for each of these cases. The relative advantages and limitations of the ultrasound system will be presented. The applicability of the ultrasonic sensor to acoustic mine detection will also be addressed.
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