Planar and linear fiber optic acoustic sensors embedded in an el

Details Planar and linear fiber optic acoustic sensors embedded in an el Planar and linear fiber optic acoustic sensors embedded in an el

1992-08-20

1994-11-22

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

25022719, 385 12, G01B 902

Patent

active

053673760

ABSTRACT:
A interferometric planar and linear fiber optic sensor system comprised of a sensor element and a reference element. In the planar fiber optic sensor system the sensor and reference fibers are shaped in loops circularly and uniformly, heat treated or bonded together and embedded in a spiral pattern within a low Bulk Modulus and Young's Modulus elastomer encapsulant. The invention results in high and frequency independent sensitivity which minimizes acceleration effects. For the linear sensor, the sensing fiber is shaped in loops forming a linear chain which is embedded in an appropriate low bulk modulus elastomeric encapsulant. The reference fiber is shaped in loops around a cylindrical aluminum mandrel within which the input and output fiber cables and couplers are encapsulated in a high bulk modulus material epoxy resin. In both the planar and linear forms, the sensing and reference fiber may be of equal length, however, the reference fiber may be of a shorter length when a coherent light source is utilized.

REFERENCES:
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patent: 4621896 (1986-11-01), Lagakos et al.
patent: 4979798 (1990-12-01), Lagakos et al.
patent: 4994668 (1991-02-01), Lagakos et al.
patent: 5140559 (1992-08-01), Fisher
J. A. Bucaro et al., High Frequency Response of Fiba-Optic Planar Acoustic ensors, J of Lightutive Technology, vol. 9, No. 9, Sep. 91, pp. 95-1199.
N. Lagakos et al. Planar Flexible Fiber-Optic Interferometer Acoustic Sensor, Optic Ltrs, vol. 13, No. 9, Sep. 1988, pp. 788-790.
N. Lagakos, Frequency and Temperature Dependence of Elastic Moduli of Polymers, J. Appl. Phys, 59(12), 15 Jun. 86. pp. 4017-4031.

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