scholarly journals Research on the Frequency Response and Dynamic Range of the Quadrature Fiber Optic Fabry–Perot Cavity Microphone Based on the Differential Cross Multiplication Demodulation Algorithm

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6152
Author(s):  
Baokai Ren ◽  
Jin Cheng ◽  
Longjiang Zhao ◽  
Zhenghou Zhu ◽  
Xiaoping Zou ◽  
...  
Keyword(s):  
Frequency Response ◽  
Differential Cross ◽  
Fiber Optic ◽  
Dynamic Range ◽  
Sampling Rate ◽  
Data Sampling ◽  
Upper Limit ◽  
Fabry Perot ◽  
Quadrature Phase ◽  
Phase Deviation

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.

Quadrature phase-stabilized three-wavelength interrogation of a fiber-optic Fabry–Perot acoustic sensor

2019 ◽  
Vol 44 (22) ◽  
pp. 5402 ◽  
Author(s):  
Qiang Liu ◽  
Zhenguo Jing ◽  
Yueying Liu ◽  
Ang Li ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Acoustic Sensor ◽  
Fabry Perot ◽  
Quadrature Phase

High-resolution, large dynamic range fiber-optic thermometer with cascaded Fabry–Perot cavities

2016 ◽  
Vol 41 (21) ◽  
pp. 5134 ◽  
Author(s):  
Guigen Liu ◽  
Qiwen Sheng ◽  
Weilin Hou ◽  
Ming Han
Keyword(s):  
High Resolution ◽  
Fiber Optic ◽  
Dynamic Range ◽  
Large Dynamic Range ◽  
Fabry Perot

scholarly journals Ripple Suppression in Broadband Microwave Photonic Phase Shifter Frequency Response

2018 ◽  
Vol 8 (12) ◽  
pp. 2433 ◽  
Author(s):  
Weicheng Xia ◽  
Ruiqi Zheng ◽  
Bijuan Chen ◽  
Erwin Chan ◽  
Xudong Wang ◽  
...  
Keyword(s):  
Frequency Response ◽  
Phase Shifter ◽  
Dynamic Range ◽  
Optical Filter ◽  
Signal Amplitude ◽  
Wide Frequency Range ◽  
Amplitude Variation ◽  
Microwave Photonic ◽  
Phase Deviation ◽  
Hybrid Coupler

This paper presents a detailed investigation on the cause of ripples in the frequency response of a microwave photonic phase shifter implemented using a 90° hybrid coupler. It was found that an unwanted radio frequency (RF) modulation sideband is generated at the modulator output due to the 90° hybrid coupler amplitude and phase imbalance. This resulted in phase shifter output RF signal amplitude variation and phase deviation. Experimental results demonstrated that incorporating an optical filter in the phase shifter structure can reduce the amplitude variation and phase deviation from 4.2 dB to 2.2 dB and from ±12° to ±3.8°, respectively, over a wide frequency range. A comparison of the loss and the dynamic range of the microwave photonic phase shifter implemented using a 90° hybrid coupler with a conventional fiber optic link is also presented.

Analysis on Upper Limit of Dynamic Range of Fiber Optic Interferometric Hydrophone Using Digital Heterodyne Detection Scheme

2011 ◽  
Vol 31 (8) ◽  
pp. 0806011 ◽  
Author(s):  
张楠 Zhang Nan ◽  
孟洲 Meng Zhou ◽  
饶伟 Rao Wei ◽  
熊水东 Xiong Shuidong
Keyword(s):  
Fiber Optic ◽  
Dynamic Range ◽  
Heterodyne Detection ◽  
Detection Scheme ◽  
Upper Limit

scholarly journals Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry–Pérot Etalons with Different Q Factors

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 118
Author(s):  
Jiamin Chen ◽  
Chenyang Xue ◽  
Yongqiu Zheng ◽  
Jiandong Bai ◽  
Xinyu Zhao ◽  
...  
Keyword(s):  
Sound Pressure ◽  
Fiber Optic ◽  
Dynamic Range ◽  
Q Factor ◽  
Acoustic Detection ◽  
Performance Study ◽  
Application Range ◽  
Acoustic Performance ◽  
Fabry Perot ◽  
Q Factors

The ideal development direction of the fiber-optic acoustic sensor (FOAS) is toward broadband, a high sensitivity and a large dynamic range. In order to further promote the acoustic detection potential of the Fabry–Pérot etalon (FPE)-based FOAS, it is of great significance to study the acoustic performance of the FOAS with the quality (Q) factor of FPE as the research objective. This is because the Q factor represents the storage capability and loss characteristic of the FPE. The three FOASs with different Q factors all achieve a broadband response from 20 Hz to 70 kHz with a flatness of ±2 dB, which is consistent with the theory that the frequency response of the FOAS is not affected by the Q factor. Moreover, the sensitivity of the FOAS is proportional to the Q factor. When the Q factor is 1.04×106, the sensitivity of the FOAS is as high as 526.8 mV/Pa. Meanwhile, the minimum detectable sound pressure of 347.33 μPa/Hz1/2  is achieved. Furthermore, with a Q factor of 0.27×106, the maximum detectable sound pressure and dynamic range are 152.32 dB and 107.2 dB, respectively, which is greatly improved compared with two other FOASs. Separately, the FOASs with different Q factors exhibit an excellent acoustic performance in weak sound detection and high sound pressure detection. Therefore, different acoustic detection requirements can be met by selecting the appropriate Q factor, which further broadens the application range and detection potential of FOASs.

Sign in / Sign up

Export Citation Format

Share Document