"Non-contact thermoacoustic detection of embedded targets using airborne-capacitive micromachined ultrasonic transducers"

by Hao Nan, Kevin C. Boyle, Nikhil Apte, Miaad S. Aliroteh, Anshuman Bhuyan, Amin Nikoozadeh, Butrus T. Khuri-Yakub and Amin Arbabian
2015