Low-frequency fiber optic hydrophone based on weak value amplification

Luo, Zhengchun; Yang, Yue; Wang, Zhongmin; Yu, Miao; Wu, Chongjian; Wu, Peng; Cui, Hong‐Liang

doi:10.1364/oe.400373

Cited by 32 publications

(11 citation statements)

References 34 publications

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“…The underwater acoustic detection experiment and towing test were conducted in the lake of Mogan Mountain, showing a responsivity of −135 dB in the frequency range from 20 Hz to 1000 Hz. Various configurations of interferometric FOH based on idea of Bucaro [ 106 , 107 , 108 ] have been proposed too. We also designed an FOH to operate in an acoustic frequency range up to 10 kHz and then developed a fiber optic towed array [ 109 ].…”

Section: Optical Fiber Sensors For Seismic Monitoringmentioning

confidence: 99%

Innovative Photonic Sensors for Safety and Security, Part III: Environment, Agriculture and Soil Monitoring

Breglio

Bernini

Berruti

et al. 2023

Sensors

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In order to complete this set of three companion papers, in this last, we focus our attention on environmental monitoring by taking advantage of photonic technologies. After reporting on some configurations useful for high precision agriculture, we explore the problems connected with soil water content measurement and landslide early warning. Then, we concentrate on a new generation of seismic sensors useful in both terrestrial and under water contests. Finally, we discuss a number of optical fiber sensors for use in radiation environments.

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Section: Optical Fiber Sensors For Seismic Monitoringmentioning

confidence: 99%

Innovative Photonic Sensors for Safety and Security, Part III: Environment, Agriculture and Soil Monitoring

Breglio

Bernini

Berruti

et al. 2023

Sensors

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show abstract

“…In 2014, a linear towed array with four fiber laser hydrophones using a DFB-FL was used as the sensing element [ 9 ] and was tested in Mogan Mountain lake. More recently, various configurations of interferometric FOH have been proposed [ 10 , 11 , 12 ]. Among these, a fiber-optic towed array operating in an acoustic frequency range up to 10 kHz was recently demonstrated [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

An Innovative Fiber-Optic Hydrophone for Seismology: Testing Detection Capacity for Very Low-Energy Earthquakes

Guardato

Riccio

Janneh

et al. 2023

Sensors

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An innovative fiber-optic hydrophone (FOH) was developed and investigated via an experiment at sea; it is capable of operating at a very low frequency of the seismic spectrum and detecting small magnitude earthquakes. The FOH exploits an optical fiber coil wrapped around a sensitive mandrel in a Michelson interferometric configuration. The FOH operated for about seven days at a water depth of 40 m, in the Campi Flegrei volcanic area (Southern Italy), and a few meters from a well-calibrated PZT hydrophone used as a reference. Thirty-three local earthquakes occurred during the simultaneous operation of the two hydrophones, allowing a straightforward comparison of the recordings. The local earthquakes occurred at an epicentral distance less than 2.5 km from the site of recording, and were estimated to be in the range of magnitude from −0.8 to 2.7. The analysis of the recorded earthquake waveforms in the frequency and time domains allowed retrieving the response function of the FOH in the frequency range from 5 to 70 Hz. The FOH responsivity in terms of acoustic pressure reached about 230 nm/Pa and was flat in the studied frequency range. Due to the high quality of the FOH recordings, this equipment is suitable for applications addressing submarine volcanic activity and the background seismicity of active faults in the ocean.

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“…For instance, while large-sized piezoelectric acoustic sensors possess a high sensitivity and signal-to-noise ratio, it is disadvantageous to sensor miniaturization that is urgently desired in practical applications, and the low resonant frequency of membranes result in a narrow frequency response of sensors. Furthermore, in order to adapt to the expansion of the acoustic detection field and the application requirements of the harsh environment, fiber-optic acoustic sensors (FOASs) with the advantages of a high sensitivity [6][7][8][9], immunity to electromagnetic interference [10][11][12], high temperature resistance and miniaturization [13,14] have been widely studied and applied in the fields of national defense security [15,16], medical diagnosis [17][18][19] and non-destructive testing [20,21]. At present, optical fiber [8] and membrane [22][23][24][25][26] are the most commonly used sound-sensitive element.…”

Section: Introductionmentioning

confidence: 99%

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

Chen¹,

Chen²,

Zheng³

et al. 2022

Micromachines

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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.

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Low-frequency fiber optic hydrophone based on weak value amplification

Cited by 32 publications

References 34 publications

Innovative Photonic Sensors for Safety and Security, Part III: Environment, Agriculture and Soil Monitoring

Innovative Photonic Sensors for Safety and Security, Part III: Environment, Agriculture and Soil Monitoring

An Innovative Fiber-Optic Hydrophone for Seismology: Testing Detection Capacity for Very Low-Energy Earthquakes

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

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