Chinese Optics Letters, 2011, 9 (1): 013101, Published Online: Jan. 7, 2011
A novel optical multilayer hydrophone with a triangular pyramid substrate Download: 572次
薄膜 光学薄膜水听器 膜系导数模型 声光灵敏度 基片结构 230.1040 Acousto-optical devices 280.4788 Optical sensing and sensors 310.6845 Thin film devices and applications 310.6870 Thin films, other properties
Abstract
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.
Suyong Wu, Xingwu Long, Kaiyong Yang, Yun Huang. A novel optical multilayer hydrophone with a triangular pyramid substrate[J]. Chinese Optics Letters, 2011, 9(1): 013101.