Optical time-domain reflectometry

Details Optical time-domain reflectometry Optical time-domain reflectometry

1986-08-19

1989-04-18

McGraw, Vincent P.

Optics: measuring and testing

Optical pyrometers

With sample engaging rod or tube

250227, 356301, 374131, G01J 510, G01N 2165

Patent

active

048231665

ABSTRACT:
An optical time-domain reflectometry method of sensing respective values of a physical parameter, such as temperature, at different locations along an optical fibre, in which back-scattered optical radiation is used to produce output signals indicative of the values being sensed, is improved by employing optical filtering means to ensure that the back-scattered radiation used is restricted to a preselected single spectral line resulting from inelastic scattering in the fibre, for example one of the Anti-Stokes Raman lines, or to two mutually adjacent such lines.

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patent: 4081215 (1978-03-01), Penney et al.
patent: 4459024 (1984-07-01), Gergely
patent: 4545253 (1985-10-01), Avicola
patent: 4545679 (1985-10-01), Moore et al.
patent: 4555179 (1985-11-01), Langerhole et al.
patent: 4560286 (1985-12-01), Wickersheim
Hartog et al., "A Fibre-Optic Temperature Distribution Sensor" Conference: Colloqnium on Optical Fibre Sensors, London, England, May 26, 1982, pp. 2/1&2/2.
Control and Insutrimentation, Sep. 1984, pp. 41-43, John Dakin "Fibre Optic Sensors, Principles & Applications".
J. Phys. E: Sci. Instrum., vol. 18, 1985, pp. 914-919, "Diode Array Spectrometer, an Optimised Design".

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