A Fiber Optic Hydrophone Used for Thin Line Towed Array

Zhaoqing, 运朝青 Yun; Hong, 罗洪 Luo; Zhengliang, 胡正良 Hu; Yongming, 胡永明 Hu

doi:10.3788/aos201232.1206004

Cited by 5 publications

(2 citation statements)

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“…Where the phase changes eφ is demodulated by array signal processing with identical UWFBGs. It is clearly that the sensitivity is closely related to the demodulation amplitude from equation (12). Figure 8 Since acoustic wave is set at a single frequency for a short time (2ms), what can be seen from Figure 9, the FOH and PZT hydrophones both have the sinusoidal response as the acoustic wave hits the sensor.…”

Section: Sensitivity Analysismentioning

confidence: 93%

“…Generally, FOHs towed array are based on three kinds of sensor configurations. The conventional structure are complicated with many discrete optical components fusion joints, which making the array not only costly, but also difficult to manufacture with poor reliability [11][12][13] . In recent years, demonstrations of a towed array based on fiber coil with a flexible elastic bar have been reported [14][15][16][17][18][19] .…”

Section: Introductionmentioning

confidence: 99%

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Underwater acoustic azimuth angle estimation with a millimetre diameter flexible hydrophone towed array

Wu,

Huang,

Pang

et al. 2024

Preprint

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This paper investigates a millimetre diameter hydrophone towed array cable for acoustic direction finding. The mechanism of the underwater acoustic waves received by this linear array without any mandrel structure is deduced and it is demonstrated that the amplitude of its response varies with the direction of the sound wave. An anechoic pool experiment is carried out to test the performance of such a hydrophone array. The hydrophone unit consists of a sensing fiber between adjacent UWFBGs, coiled into 9 cm diameter fiber rings, with arbitrary 6 fiber rings, called a 6-element hydrophone array, suspended horizontally in the sound-absorbing wedge to receive acoustic signals. An average sensitivity of − 141.2 dB re rad/µPa at frequencies from 2.5 kHz to 6.3 kHz was achieved. Direction detection at an angle of 75° is realised, validating the detection of the azimuth of underwater acoustic waves. The ultra-thin towing cable system, with free structure, high sensitivity and underwater target detection capability that it has demonstrated has great potential for future Unmanned Underwater Vehicle (UUV) applications.

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Section: Sensitivity Analysismentioning

confidence: 93%