Fiber-optical pressure detector

Details Fiber-optical pressure detector Fiber-optical pressure detector

G - Physics

01

L

73/53, 340/140.1

G01L 11/00 (2006.01) G01B 11/16 (2006.01) G01L 1/24 (2006.01) G01M 11/08 (2006.01) G08B 13/12 (2006.01)

Patent

CA 1192761

ABSTRACT OF THE DISCLOSURE An optical fiber disposed between a light source and a photodetector is subjected at a number of points, equi- spaced along its axis, to a transverse pressure causing a significant attenuation of the transmitted luminous radi- ation. The optimum spacing of the pressure points is a function of the radius of the fiber core and of the refrac- tive 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 con- stituted 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.

418069

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