Download PDF by D. A. Jackson (auth.), A. N. Chester, S. Martellucci, A. M.: Optical Fiber Sensors

By D. A. Jackson (auth.), A. N. Chester, S. Martellucci, A. M. Verga Scheggi (eds.)

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A further consideration in the design of the fibre optic hydrophone (as in the case of all hydrophones) is that the sensitivity will become both frequency- and directiondependent as the wavelength of the sound begins to approach the dimensions of the hydrophone; further frequency-dependent effects can also be expected as the sound wavelength approaches the dimensions of the fibre coil itself (Jarzynski et al 1981). Other forms of fibre optic hydrophone have recently been demonstrated and are discussed by Dakin in this volume.

An example is provided here to estimate actual sensor performance for the normalized sensitivity. 0 x 10 -12 cm2 /dyne for a 410 m coating thickness of Teflon PFA 340. 83 ~m have been assumed. 3 x 10-4 dynes/cm- 2 • Such a detection level compares favorably with conventional acoustic sensors. 'i:I. 20 HYTREL COATED ~ ..!!. -&IQ. <1<1 -& 15 ~ > UNCONSTRAINED ISOTROPIC ~ E 1/1 Z w 1/1 AXIALLY CONSTRAINED ANISOTROPIC 10 W 1/1 c :z: Q. * w .... C n = 2 AXIALLY CONSTRAINED RADIALLY ISOTROPIC 0 t:! 0 5 ~ II: 0 UNCOATED Z 0 Fig.

1980, Proposal for detection of magnetostrictive perturbation of optical fibres, Opt. Lett. 2, 87. 35 OPTICAL FIBER INTERFEROMETER TECHNOLOGY AND HYDROPHONES Thomas G. Gia110renzi Naval Research Laboratory Washington, DC 20375-5000 1. INTRODUCTION Because of the extremely high sensitivities possible with interfermetric fiber sensors many laboratories have conducted research on these devices. , could be measured. The application of these coatings usually is straightforward and does not affect the optical performance of the optical fiber waveguide.

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