The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 25, 1986
Filed:
Dec. 17, 1982
Alan L Harmer, Plan Les Ouates, CH;
Battelle Memorial Institute, Carouge, CH;
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.