Apparatus for sensing temperature and/or strain in an object wit

Details Apparatus for sensing temperature and/or strain in an object wit Apparatus for sensing temperature and/or strain in an object wit

1998-03-19

2000-01-25

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 32, H01J 516

Patent

active

060181605

ABSTRACT:
Apparatus for sensing temperature and/or strain in an object includes a broadband light source (1), connector means (2) in the form of an optical circulator or an optical coupler to which at least two substantially identical optical fiber Bragg gratings (4, 5) are connected. Grating (4) receives the broadband light from the connector means (2) and functions as a sensor of temperature and/or strain in an object. Light is reflected back from the grating (4) to the connector means (2) and then passed to the grating (5) which acts as a reference grating through which a light output signal is transmitted to a detector (8) which is conveniently a photodetector. Means are provided for chirping the two gratings (4, 5) at the same bandwidth and the detector (8) measures the intensity of the received light output signal, with the intensity being monotonically related to the change in temperature and/or strain sensed by the grating (4) in the object.

REFERENCES:
patent: 5380995 (1995-01-01), Udd et al.
patent: 5534993 (1996-07-01), Ball et al.

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