A novel optical multilayer hydrophone with a triangular pyramid substrate
2011
A novel concept for an optical multilayer ultrasonic hydrophone with the
sensing film deposited on a triangular pyramid glass substrate is proposed. Using
the calculation model for the spectral coefficients' derivatives of a dielectric
multilayer optical coating, the acousto-optic sensitivity characteristic of the
hydrophone is analyzed with different measurement laser polarizations and incident
angles. We present a reasonable method and adjusting strategy for the optimum
working point selection of the ultrasound measurement. Analytic results show that
the novel hydrophone possesses all the other merits of a plate glass substrate
optical multilayer hydrophone but with improved detection sensitivity. A longer
measurement time without distortion decreases the difficulty of high frequency
signal circuits. Spatial split of the ultrasound signal caused by the substrate's
triangular pyramid roof simplifies the spatial spot area correction, which
contributes to the accurate calibration of the hydrophone's wideband frequency
response.
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