Fiber-optical pressure detector

Details Fiber-optical pressure detector Fiber-optical pressure detector

G - Physics

01

L

73/53

G01L 1/24 (2006.01)

Patent

CA 1268640

- ? - FIBER-OPTICAL PRESSURE DETECTOR ABSTRACT OF THE DISCLOSURE 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 caus- ing 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.

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