Experimental Research on DFB Fiber Laser Hydrophone Towed Line Array

Bo, 唐波 Tang; Junbin, 黄俊斌 Huang; Hongcan, 顾宏灿 Gu; Xin, 毛欣 Mao

doi:10.3788/gzxb20174604.0406004

Cited by 5 publications

(2 citation statements)

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“…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] . F.A.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

Wu,

Huang,

Pang

et al. 2024

Preprint

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“…Tang Bo produced a prototype of 32-element fiber laser hydrophone towed array with a diameter of only 16 mm, and then, lake trials were conducted successfully. 10 Guo made a 32-element fiber grating interferometric towed hydrophone array with an outer diameter of 20 mm, whose acoustic pressure phase sensitivity is about −143.9 dB (re rad/μPa). 11 However, in recent years, the achieved diameter of FBG hydrophone towed linear arrays has been less than 20 mm in China.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin interferometric hydrophone towed line array based on uwFBG

Wu,

Gu,

Pang

et al. 2023

AIP Advances

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In order to improve the suitability of the fiber hydrophone towing line array, we propose an interferometric hydrophone towed line array with a diameter of 1.7 mm. The line array is an integration of sensitization and package, embedding grating sensors in the composite materials of Kevlar and polyurethane in an additional pultrusion process. The theory and experiment indicate that polymer cladding of pultrusion is an effective way to improve phase sensitivity, increasing mechanical strength and decreasing cable diameter simultaneously. Then, a hydroacoustic detection system, with a quasi-distributed ultra-weak fiber Bragg grating towed line array, based on unbalanced interference is established and its phase sensitivities are tested experimentally. The result is measured by the vibration liquid column method and compared with a standard piezoelectric underwater acoustic detector. Over the frequency range of 200–2000 Hz, the system has a good amplitude–frequency response. We obtain an average phase sound pressure sensitivity of about −147.96 dB (re 1 rad/μPa) and a relative flatness response of 3 dB. The experimental results show that this system provides the possibility of an integrated hydrophone towed linear array with high adaptability and reliability.

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