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2008 IEEE Radio and Wireless Symposium
The use of sound as a means to gather information about our environment has been developed with limited scope over the past several decades. The primary application of this technology has been ultrasound and ultrasonic ranging. Recent developments in nonlinear acoustics have proven that two-tone measurements and directional high frequency parametric arrays can extract much more information about the size, shape, and density of objects under inspection. However, acoustic measurements aredoi:10.1109/rws.2008.4463496 fatcat:bdo67eqeszhr5jjsjge7u7x4ni