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High-Sensitivity Fiber-Optic Low-Frequency Acoustic Detector Based on Cross-Correlation Demodulation

Fiber-optic acoustic sensors based on Fabry-Perot (F-P) interference structure have advantages of compact structure, high sensitivity, convenience to manufacture and immunity to electromagnetic interference. To simplify the demodulation system of the fiber-optic F-P sensor and reduce the demodulation cost, a low-frequency acoustic detector based on the principle of optical cross-correlation (OCC) demodulation is proposed. A fiber-optic F-P interference sensor based on the phenylene sulfide (PPS) diaphragm is used as a low-frequency acoustic detection unit. The OCC demodulation system of the F-P acoustic sensors mainly includes a superluminescent diode (SLED), a flat glass wafer and single-mode fibers. The flat glass wafer is used as the static correlation reference cavity of the PPS diaphragm-based F-P acoustic sensor. The experimental results show that the detector is responsive to low-frequency acoustic waves from below 20 Hz to 250 Hz. For the acoustic waves with a frequency of 20 Hz, the minimum detection limit (MDL) of sound pressure is 0.65 mPa. The detector has the potential for low-cost and high-sensitivity acoustic detection for applications such as infrasonic detection and photoacoustic gas detection.

Ketersediaan

Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.40 No.13 July 1 2022

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 4481-4488

Bahasa

English

ISBN/ISSN

-

Klasifikasi

NONE

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

FABRY-PEROT (F-P) INTERFERENCE
FIBER-OPTIC ACOUSTIC SENSOR (FOAS)
LOW-FREQUENCY ACOUSTIC DETECTOR
OPTICAL CROSS-CORRELATION (OCC) DEMODULATION
STATIC CORRELATION REFERENCE CAVITY

Info Detail Spesifik

DOI: 10.1109/JLT.2022.3164134

Pernyataan Tanggungjawab

Min Guo, Ke Chen, Guangyin Zhang, Chenxi Li, Xinyu Zhao, Zhenfeng Gong, Qingxu Yu

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