Novel Fiber Optic Acoustic Sensor System

这笔赠款为探索开发一种用于高频带宽测量的新型光纤声学系统提供资金。传感器系统的新颖性将来自于包括基于法布里-珀罗腔的外部传感能力、基于集成光学电路的相位调制器、高速光电探测器以及基于新的多步相移算法的数字解调方案。法布里-珀罗腔将位于光纤尖端和传感器的膜片结构之间，相位调制器中的马赫-曾德尔干涉仪将与法布里-珀罗结构进行路径匹配，作为读出干涉仪。为了开发传感器和了解传感器的机理，我们将进行实验和分析工作。开发这种传感器系统的一个潜在风险是，它可能不能像其他光纤传感器那样进行多路传输。如果成功，该传感器系统的开发将对声音和振动传输问题的集成主动控制系统产生巨大影响，目前可用于高频带宽应用的多路传感器并不容易获得。此外，如果对传感器系统进行改造，它可以用于水下流动中的高频带宽压力测量。传感器系统在汽车工业中也可能有应用，例如点火室。

This grant provides funding for exploring the development of a novel fiber optic acoustic system for high-frequency bandwidth measurements. The novelty of the sensor system will be derived from the inclusion of extrinsic sensing capabilities based on a Fabry-Perot cavity, an integrated optical circuit based phase modulator, a high-speed photo detector, and a digital demodulation scheme based on a new multi-step phase stepping algorithm. The Fabry-Perot cavity will be located between the fiber tip and the diaphragm structure of the sensor, and the Mach-Zehnder interferometer in the phase modulator will be path matched with the Fabry-Perot arrangement to act as a read-out interferometer. Both experimental efforts and analytical efforts will be pursued for developing the sensor and understanding the sensor mechanics. A potential risk involved in the development of this sensor system is that it may not be amenable to multiplexing as the other fiber-optic sensors. If successful, the development of this sensor system will have a tremendous impact on integrated active control systems for sound and vibration transmission problems where currently multiplexable sensors for high-frequency bandwidth applications are not readily available. Furthermore, if the sensor system is adapted, it can be used for high-frequency bandwidth pressure measurements in underwater flows. The sensor system may also have applications in the automotive industry such as ignition chambers