Patent · US Expired

Optical sensor activation device

US6021240A · kind A · utility

77Cited by
14References
14Claims
0Family size

Assignee

Inventors

Key dates

Filing dateOct 2, 1997
Grant dateFeb 1, 2000
Priority date—
Expiry dateOct 2, 2017

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG02B6/02104
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

An optical sensor having at least one long period grating disposed within an optical waveguide is provided. The optical waveguide has a refractive index profile. The long period grating has a plurality of index perturbations spaced apart by a periodic distance .LAMBDA.. The long period grating promotes an excitation of confined propagating broadband light into higher order modes that excite a sensing mechanism. The excitation of confined propagating broadband light is spectrally dependent on the periodic distance of the long period grating and the refractive index profile of the optical waveguide.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.