Response of in-Fibre Bragg Gratings to Focused Ultrasonic Fields

Fisher, NE; O’Neill, SF; Webb, DJ; Pannell, CN; Jackson, D.A.; Lr, Gavrilov; Hand, J.W.; Zhang, L; Bennion, I.

doi:10.1364/ofs.1997.owc12

Cited by 9 publications

(5 citation statements)

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“…We also found that the sidebands did not fall to zero as the OPD between the two arms of the MZI approached zero, but remained finite and were of equal magnitude. 21 Despite these anomalies, we recorded the results in Fig. 5, which shows the detected magnitude of one of the sidebands normalized by its corresponding carrier signal ͑to compensate for any intensity fluctuations of light levels in the system͒ as a function of acoustical pressure incident on the IFBG.…”

Section: Preliminary Resultsmentioning

confidence: 99%

Ultrasonic hydrophone based on short in-fiber Bragg gratings

Fisher¹,

Webb²,

Pannell³

et al. 1998

Appl. Opt.

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We investigate the feasibility of using in-fiber Bragg gratings for measuring acoustic fields in the megahertz range. We found that the acoustic coupling from the ultrasonic field to the grating leads to the formation of standing waves in the fiber. Because of these standing waves, the system response is complex and, as we show, the grating does not act as an effective probe. However, significant improvement in its performance can be gained by use of short gratings coupled with an appropriate desensitization of the fiber. A noise-limited pressure resolution of Ϸ4.5 ϫ 10 Ϫ3 atm͞ ͌ Hz was found.

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Section: Preliminary Resultsmentioning

confidence: 99%

Ultrasonic hydrophone based on short in-fiber Bragg gratings

Fisher¹,

Webb²,

Pannell³

et al. 1998

Appl. Opt.

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“…Specifically, the use of the sensors was for distributed in vivo sensing of ultrasound. Additional work [89]- [92] investigated the interaction of the FBG with the ultrasonic field. It was found that the upper limit on the incident acoustic frequency is set by the length of the grating.…”

Section: Fiber Bragg Grating (Fbg) Sensorsmentioning

confidence: 99%

Acousto-Ultrasonic Optical Fiber Sensors: Overview and State-of-the-Art

2008

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“…2. When we use a FBG as an acoustic sensor in water, the wavelength of the incident light is tuned to a particular wavelength where the magnitude of the slope of the transmittance-vs.-wavelength curve is large and the transmitted power of the light may be written in the following form: P, = (2) where and ? are the power and the wavelength of the incident light, and T(2) is the transmittance of the FBG as a function of optical wavelength.…”

Section: Introductionmentioning

confidence: 99%

<title>Fiber Bragg grating WDM underwater acoustic sensor with directivity</title>

et al. 1999

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An optical fiber sensor with two fiber Bragg gratings in serial connection which is multiplexed in an optical wavelength domain is constructed to sense an acoustic field in water. Both the gratings are inserted between optical isolators in order to stabilize the sensor by suppressing Fabry-Perot interference in fiber that is caused by small reflections from fiber end facet, connectors and an optical coupler. The two gratings in the sensor are confirmed to work independently and have little influence on each other. Comparison of the experimental data to the theoretical prediction shows that the developed sensor can detect the relative phase between two points in the acoustic field and thereby determine the direction of the acoustic source. Since a fiber Bragg grating can make an optical sensor of high sensitivity and wide dynamic range and can be easily multiplexed with an arrayed structure in either one or two dimension, it will then offer a convenient tool to measure distribution of amplitude and phase of an acoustic field in water.

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Response of in-Fibre Bragg Gratings to Focused Ultrasonic Fields

Cited by 9 publications

References 0 publications

Ultrasonic hydrophone based on short in-fiber Bragg gratings

Ultrasonic hydrophone based on short in-fiber Bragg gratings

Acousto-Ultrasonic Optical Fiber Sensors: Overview and State-of-the-Art

<title>Fiber Bragg grating WDM underwater acoustic sensor with directivity</title>

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