Fiber-optical pressure detector

Details Fiber-optical pressure detector Fiber-optical pressure detector

1985-11-14

1986-10-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

324 96, 73705, H01J 516

Patent

active

046187642

ABSTRACT:
An optical fiber disposed between a light source and a photodetector is subjected at a number of points, equispaced along its axis, to a transverse pressure causing a significant attenuation of the transmitted luminous radiation. The optimum spacing of the pressure points is a function of the radius of the fiber core and of the refractive indices of its core and its envelope. These pressure points are formed by turns of a substantially incompressible helix which is wound around the fiber and which may be constituted by an internal or external rib of a surrounding flexible sheath of similarly incompressible material. The pressure may be applied by a piezoelectrical transducer and may be modulated by an electrical signal to be picked up by the photodetector.

REFERENCES:
patent: 4342907 (1982-08-01), Macedo et al.
patent: 4381140 (1983-04-01), Van der Hoek et al.
patent: 4408829 (1983-10-01), Fitzgerald et al.
patent: 4421979 (1983-12-01), Asawa et al.

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