Assessment of Dynamic Range in Interferometric Fiber Optic Hydrophones Based on Homodyne PGC Interrogator

Kumar, S Sham; Khansa, C. A.; Praveen, T. V.; Sreehari, C. V.; Santhanakrishnan, T.; Rajesh, R.

doi:10.1109/jsen.2020.3006931

Cited by 20 publications

(4 citation statements)

References 24 publications

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“…Acoustic demodulation schemes are also largely affected by 2 > REPLACE THIS LINE WITH YOUR MANUSCRIPT ID NUMBER (DOUBLE-CLICK HERE TO EDIT) < the properties of interferometric spectra, which play an important role in enhancing fiber-optic acoustic sensing performance [26,27]. Intensity demodulation and phase demodulation are often employed as the two primary schemes for dynamic signal demodulation.…”

Section: Introductionmentioning

confidence: 99%

High-Sensitivity EFPI-Based Acoustic Sensor Using in-Fiber Collimator and Adjustable 45° Mirror

Zhang,

Luo,

Zhang

et al. 2024

IEEE Photonics J.

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In this paper, a high-sensitivity cross-axial extrinsic Fabry-Perot interferometric (EFPI) acoustic sensor is proposed and experimentally demonstrated. The cross-axial EFPI is constructed by optical fiber and cantilever's inner surface, assisted with an adjustable 45° mirror. Herein, the 45° mirror is utilized to achieve beam total reflection and flexibly adjust the parallelism of the two reflectors. A quarter-pitch graded index fiber (GIF) is introduced as an in-fiber collimator to reduce beam propagation loss and thus enhance coupling efficiency. Experimental results show that the proposed sensor achieves a high fringe visibility of up to 41 dB, greatly enhancing acoustic sensing performance. Furthermore, the sensitivity and the minimum detectable pressure (MDP) measured at resonance frequency (@2.05 kHz) are significantly improved to be 70.67 mV/Pa that is corresponding to mechanical sensitivity of ~2490 nm/Pa, and 13.4 μPa/Hz 1/2 , respectively. The proposed sensor demonstrates the potential for low-frequency vibration monitoring with the advantages of easy fabrication, highsensitivity and flexible manipulability.

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Section: Introductionmentioning

confidence: 99%

High-Sensitivity EFPI-Based Acoustic Sensor Using in-Fiber Collimator and Adjustable 45° Mirror

Zhang,

Luo,

Zhang

et al. 2024

IEEE Photonics J.

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“…This method focuses on the phase information from the voltage change of the photodetectors. It consists of the heterodyne method [15,16], the homodyne based on the Phase Generated Carrier (PGC) method [17,18], and the passive homodyne using the Naval Postgraduate School (NPS) method [19,20]. These methods can efficiently suppress optical noise and are immune to working point drift.…”

Section: Introductionmentioning

confidence: 99%

Improved demodulation method for fibre optic sensors applied in transformer partial discharge detection

et al. 2022

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The 2 × 2 couplers, as a demodulation core of the fibre optic sensing system, have been extensively employed in fibre optic sensors for partial discharge (PD) detection of power equipment. However, the unstable demodulation sensitivity and low signal‐to‐noise ratio (SNR) of such a system are still unsatisfactory in engineering. This work uses a distributed feedback fibre laser as the sensor and employs a common asymmetric 2 × 3 coupler instead of a 2 × 2 coupler as the demodulation core to design a PD detection system. Then, we propose a new demodulation method for PD acoustic emission signals based on the Naval Postgraduate School method. On the PD detection platform, the performance of the conventional detection system and the proposed system is compared. The experimental results show that the proposed system has better reliability and can identify the PD signals in all instances. Furthermore, the average SNR of the new demodulation method is 6.11 dB higher than the traditional 2 × 2 coupler system and can be extended to most PD detection systems using fibre optic sensors.

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“…As a new type of microphone, the fiber optic microphone (FOM) has the advantages of high sensitivity, low propagation loss, and resistance to electromagnetic interference compared with the existing electric, piezoelectric, capacitive, and other traditional acoustic microphones [1][2][3][4]. Therefore, it have a wide range of applications, especially irreplaceable applications in acoustic source detection under a strong electromagnetic environment [5].…”

Section: Introductionmentioning

confidence: 99%

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

Ren

Cheng

Zhao

et al. 2021

Sensors

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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.

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Assessment of Dynamic Range in Interferometric Fiber Optic Hydrophones Based on Homodyne PGC Interrogator

Cited by 20 publications

References 24 publications

High-Sensitivity EFPI-Based Acoustic Sensor Using in-Fiber Collimator and Adjustable 45° Mirror

High-Sensitivity EFPI-Based Acoustic Sensor Using in-Fiber Collimator and Adjustable 45° Mirror

Improved demodulation method for fibre optic sensors applied in transformer partial discharge detection

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

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