Broad-band ultrasonic sensor based on induced optical phase shifts in single-mode fibers

Paula, R. De; Cole, James H.; Bucaro, J. A.

doi:10.1109/jlt.1983.1072126

Cited by 40 publications

(18 citation statements)

References 8 publications

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“…This is the first account of a polarimetric optical fiber acoustic sensor. Further work on polarimetric optical fiber sensors has been undertaken by dePaula et al [64]- [66], and also by Chan et al [67], [70] with Price [68], and Brinch [69]. The work of Chan et al [67] describes a polarimetric optical fiber sensor based on acoustically induced birefringence in a polarization maintaining fiber.…”

Section: Optical Fiber Interferometersmentioning

confidence: 99%

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

2008

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Section: Optical Fiber Interferometersmentioning

confidence: 99%

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

2008

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“…, which we shall call the array receiving frequencies. From (2), it is also clear that the spectral amplitude of the signal detected by an M-element array increases by a factor of M at these frequencies when compared with single element detection. Consider an N-cycle ultrasonic toneburst of frequency ω 0 received by an M-element array receiver that is tuned to this frequency, i.e., the fiber array spacing is chosen such that δ = 2πc/ω 0 .…”

Section: G(ω) = Mh(ω)s(ω)mentioning

confidence: 99%

“…Their primary advantage over conventional strain gauges and thermocouples is that they are non-electrical devices that are also very compact. A number of researchers have also developed fiber optic sensors that are capable of detecting dynamic (high frequency) phenomena such as ultrasonic fields in a liquid [2], [3] or inside a solid structure [4], [5]. Fiber-optic ultrasound sensors have potential applications in smart structure technology [6], composite materials [7], materials processing industry [8], and medicine [9].…”

Section: Introductionmentioning

confidence: 99%

Sagnac-type fiber-optic array sensor for detection of bulk ultrasonic waves

Fomitchov

Kromine

Krishnaswamy

et al. 2000

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In this paper, we describe a fiber optic array sensor suitable for detection of bulk ultrasonic waves. This sensor is based on an intrinsic fiber optic Sagnac interferometer. The fiber array is formed by multiple folding of a continuous length of an optical fiber into flat coils. Depending on the orientation of the fiber array with respect to the ultrasonic wave, the proposed sensor can act as a conventional in-phase detector or as a narrowband detector. In the narrowband mode, the center frequency of detection can be tuned by adjusting the spacing of the fiber array elements to be equal to the ultrasonic wavelength of interest. This feature distinguishes this array sensor from conventional hydrophones in which a receiver is typically much smaller than the acoustical wavelength. It is shown that the array sensor provides an enhanced signal-to-noise ratio (SNR) compared with a single element detection scheme. Results are presented for detection of ultrasonic waves in water arising from both piezoelectric and laser ultrasonic sources. Potential areas of application of this sensor include process monitoring, smart structures, bio-medical ultrasound, and chemical sensing.

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“…The principle of using a conventional single-mode fiber for ultrasound sensing has been known for some time [6]- [8]. It has been shown that when an ultrasonic wave in the megahertz range (in liquid) is incident normally upon a single-mode fiber, the fiber becomes anisotropic so that the two orthogonal linear polarizations of light in the fiber encounter different refractive indexes, and hence, propagate at different velocities [6], [8].…”

Section: Introduction T Present the Most Widely Used Device For Smentioning

confidence: 99%

“…It has been shown that when an ultrasonic wave in the megahertz range (in liquid) is incident normally upon a single-mode fiber, the fiber becomes anisotropic so that the two orthogonal linear polarizations of light in the fiber encounter different refractive indexes, and hence, propagate at different velocities [6], [8]. A polarimetric ultra- CHAN, AND JAMES L. GARDNER sonic sensor based on the detection of such induced birefringence in a single-mode fiber has been demonstrated [7].…”

Section: Introduction T Present the Most Widely Used Device For Smentioning

confidence: 99%

Detection of high-frequency ultrasound with a polarization-maintaining fiber

Chiang

Chan

Gardner

1990

J. Lightwave Technol.

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Abstruct-The effect of a high-frequency ultrasonic wave incident normally upon a polarization-maintaining optical fiber is investigated theoretically and experimentally. Two different mechanisms accounting for the change of the birefringence in the fiber due to the radial strain produced by the ultrasonic wave are identified and studied. The more well-known mechanism, which also occurs in a single-mode fiber, arises from the anisotropic strain distribution in the fiber, and is significant only at very high frequencies. The other mechanism, which occurs only in a polarization-maintaining fiber, arises from the inhomogeneous elastic properties of the fiber, and is more significant than the former mechanism at lower frequencies. Because of the latter effect, a polarization-maintaining fiber can respond to lower frequencies than a single-mode fiber in the polarimetric mode. The frequency that separates the ranges of significance of these two mechanisms is experimentally found to be about 1 MHz (in water). The principle and the realization of a polarimetric ultrasonic sensor using a polarizationmaintaining fiber are also described.

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Broad-band ultrasonic sensor based on induced optical phase shifts in single-mode fibers

Abstract: Abstract-A broad-band ultrasonic sensor based on induced optical phase shifts in single-mode fibers is demonstrated over a frequency regime of 0550 MHz. In addition, a recently developed theory used to predict the magnitudes of acoustically induced strains in optical fibers is verified.

Cited by 40 publications

References 8 publications

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

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

Sagnac-type fiber-optic array sensor for detection of bulk ultrasonic waves

Detection of high-frequency ultrasound with a polarization-maintaining fiber

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