Beard P C, Mills T N
Appl Opt. 1996 Feb 1;35(4):663-75. doi: 10.1364/AO.35.000663.
Theoretical and experimental aspects of an extrinsic optical-fiber ultrasound sensor are described. The sensor is based on a thin transparent polymer film acting as a low-finesse Fabry-Perot cavity that is mounted at the end of a multimode optical fiber. Performance was found to be comparable with that of a piezoelectric polyvinylidene dinuoride-membrane (PVDP) hydrophone with a sensitivity of 61 mV/MPa, an acoustic noise floor of 2.3 KPa over a 25-MHz bandwidth, and a frequency response to 25 MHz. The wideband-sensitive response and design flexibility of the concept suggests that it may find application as an alternative to piezoelectric devices for the detection and measurement of ultrasound.
本文描述了一种外置光纤超声传感器的理论和实验方面。该传感器基于一个薄的透明聚合物薄膜，该薄膜作为一个低精细度的法布里-珀罗腔，安装在多模光纤的末端。研究发现，其性能与灵敏度为61 mV/MPa的压电聚偏二氟乙烯膜（PVDP）水听器相当，在25 MHz带宽上的声学本底噪声为2.3 KPa，频率响应可达25 MHz。该概念的宽带敏感响应和设计灵活性表明，它可能作为压电设备的替代品，用于超声的检测和测量。
