Ren Baokai, Cheng Jin, Zhao Longjiang, Zhu Zhenghou, Zou Xiaoping, Qin Lei, Wang Yifei
Research Center for Sensor Technology, School of Applied Sciences, Mechanical Electrical Engineering School, Jianxiangqiao Campus, Beijing Information Science and Technology University, Beijing 100101, China.
College of Engineering, Qufu Normal University, Rizhao 276826, China.
Sensors (Basel). 2021 Sep 14;21(18):6152. doi: 10.3390/s21186152.
A quadrature fiber optic Fabry-Perot cavity microphone based on a differential cross multiplication algorithm consists of a pair of fibers and a membrane. It has many advantages such as high sensitivity, a simple structure, and resistance to electromagnetic interference. However, there are no systematic studies on its key performance, for example, its frequency response and dynamic range. In this paper, a comprehensive study of these two key parameters is carried out using simulation analysis and experimental verification. The upper limit of the frequency response range and the upper limit of the dynamic range influence each other, and they are both affected by the data sampling rate. At a certain data sampling rate, the higher the upper limit of the frequency response range is the lower the upper limit of the dynamic range. The quantitative relationship between them is revealed. In addition, these two key parameters also are affected by the quadrature phase deviation. The quadrature phase deviation should not exceed 0.25π under the condition that the demodulated signal intensity is not attenuated by more than 3 dB. Subsequently, a short-step quadrature Fabry-Perot cavity method is proposed, which can suppress the quadrature phase deviation of the quadrature fiber optic Fabry-Perot cavity microphone based on the differential cross multiplication algorithm.
基于差分交叉乘法算法的正交光纤法布里-珀罗腔麦克风由一对光纤和一个膜片组成。它具有许多优点，如灵敏度高、结构简单、抗电磁干扰等。然而，对于其关键性能，例如频率响应和动态范围，尚无系统研究。本文通过仿真分析和实验验证对这两个关键参数进行了全面研究。频率响应范围的上限和动态范围的上限相互影响，且它们都受数据采样率的影响。在一定的数据采样率下，频率响应范围的上限越高，动态范围的上限越低。揭示了它们之间的定量关系。此外，这两个关键参数还受正交相位偏差的影响。在解调信号强度衰减不超过3dB的条件下，正交相位偏差不应超过0.25π。随后，提出了一种短步长正交法布里-珀罗腔方法，该方法可以抑制基于差分交叉乘法算法的正交光纤法布里-珀罗腔麦克风的正交相位偏差。
