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    • 5. 发明授权
    • Variable sensitivity acoustic transducer
    • 可变灵敏度声换能器
    • US06542244B1
    • 2003-04-01
    • US09456739
    • 1999-12-07
    • Raymond C. RumpfCharles M. Newton
    • Raymond C. RumpfCharles M. Newton
    • G01B902
    • H04R23/008
    • The gauge length of an acoustic signal detector is dynamically variable by adjusting the location of an induced light reflection interface within a section of optical waveguide to which an acoustic stimulus is coupled. In an interferometer based architecture, a light beam is applied to each of an ‘acoustic signal detection’ optical waveguide and a ‘reference’ optical waveguide. The ‘acoustic signal detection’ waveguide is coupled to an acoustic energy transmission element. The acoustic input modifies the index of refraction of the optical waveguide and modulates the light passing through the waveguide. Since the index of refraction of the optical waveguide section is modified by the acoustic stimulus, the signal beam has a phase delay dependent upon the acoustic signal and the distance between one end of the signal waveguide section and an induced reflection interface. The ‘reference’ optical waveguide section also contains a reflection interface, the induced location of which is ganged with that of the signal optical waveguide section. The ‘signal’ path and ‘reference’ path beams reflected by their reflection interfaces are combined and applied to a photo-detector. The index of refraction of the material of the signal optical waveguide section is modified by the acoustic stimulus is the ‘signal path’. This ‘signal’ path light beam is combined out of phase with ‘reference’ light beam at the photo-detector.
    • 声学信号检测器的标距可以通过调节声学刺激耦合到的光波导的一部分内的感应光反射界面的位置来动态地变化。 在基于干涉仪的架构中,将光束施加到“声信号检测”光波导和“参考”光波导中的每一个。 “声信号检测”波导耦合到声能传输元件,声输入修改光波导的折射率并调制通过波导的光,由于光波导部分的折射率被修改为 声波刺激,信号光束具有取决于声信号的相位延迟和信号波导部分的一端与感应反射界面之间的距离,“参考”光波导部分还包含反射界面,诱导位置 其与信号光波导部分的结合。 由其反射界面反射的“信号”路径和“参考”路径光束被组合并应用到光检测器。 信号光波导部分的材料的折射率通过声学刺激来改变为“信号路径”,该“信号”路径光束在光检测器处与“参考”光束异相组合。