We present a pressure sensor based on a Michelson interferometer, for use inphotoacoustic tomography. Quadrature phase detection is employed allowingmeasurement at any point on the mirror surface without having to retune theinterferometer, as is typically required by Fabry-Perot type detectors. Thisopens the door to rapid full surface detection, which is necessary for clinicalapplications. Theory relating acoustic pressure to detected acoustic particledisplacements is used to calculate the detector sensitivity, which is validatedwith measurement. Proof-of-concept tomographic images of blood vessel phantomshave been taken with sub-millimeter resolution at depths of severalmillimeters.
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