Abstract: A thermal acoustic imaging (TAI) system includes a source of continuous amplitude-modulated RF or microwaves for irradiating a tissue region to be imaged, wherein a modulation frequency of the RF of microwaves resonantly excite the tissue region to emit thermal acoustic signals in response. The source preferably provides a substantially uniform power distribution in the region to be imaged. An acoustic transducer receives the thermal acoustic signals and generates an electrical signal in response. Matched filtering matched to a frequency of the amplitude-modulated RF or microwaves followed by delay-and sum or adaptive methods are preferably used to generate images from the electrical signals. The acoustic transducer is preferably a micro-electromechanical system (MEMS) transducer.

Abstract: A Moiré interferometric-based shear-stress sensor includes a substrate support. The substrate includes a first optical grating disposed in or on the substrate, the first grating having a plurality of features defining a first spatial period. A floating element having a second optical grating is disposed in or on the floating element. The second grating has a plurality of features defining a second spatial period. The floating element is suspended over the first grating and flexibly connected to the substrate with compliant springs, wherein the respective gratings are in an optical path with one another. Upon irradiation, the sensor forms a Moiré fringe pattern which relates to a shear-stress induced translation of the floating element.

Abstract: A multi-resonator-based system responsive to acoustic waves includes at least two resonators, each including a bottom plate, side walls secured to the bottom plate, and a top plate disposed on top of the side walls. The top plate includes an orifice so that a portion of an incident acoustical wave compresses gas in the resonators. The bottom plate or the side walls include at least one compliant portion. A reciprocal electromechanical transducer coupled to the compliant portion of each of the resonators forms a first and second transducer/compliant composite. An electrical network is disposed between the reciprocal electromechanical transducer of the first and second resonator.