Sensing strain and temperature

Details Sensing strain and temperature Sensing strain and temperature

1988-12-05

1989-06-27

Rosenberger, Richard A.

Optics: measuring and testing

For optical fiber or waveguide inspection

73800, 356 32, 374161, G01B 1116, G01J 538

Patent

active

048424030

ABSTRACT:
An optical fibre sensor 11 has two monomode cores 13,14 arranged in a common cladding 15 to allow cross-talk of optical signals between the cores as a function of strain, temperature and optical wavelength. Optical signals are generated by a generator 16 at two wavelengths, at one of which cross-talk between the cores 13,14 is temperature independent. The generated optical signals are injected into the element 11 via an optical fibre lead 18 having a single monomode core 19 which is connected to one of the cores 13 of the element 11 at one end thereof and after cross-talk between the cores, optical signals are extracted from the element, for example via the same lead 18, and processed to determine temperature and strain at the element.

REFERENCES:
patent: 4151747 (1979-05-01), Gottlieb et al.
patent: 4295738 (1981-10-01), Meltz et al.
patent: 4295739 (1981-10-01), Meltz et al.
patent: 4298794 (1981-11-01), Snitzer et al.
patent: 4420251 (1983-12-01), James et al.
patent: 4653906 (1987-03-01), Dunphy et al.

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