Strain-isolated Bragg grating temperature sensor

Details Strain-isolated Bragg grating temperature sensor Strain-isolated Bragg grating temperature sensor

2005-03-08

2005-03-08

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Optical fiber laser

C356S073100

Reexamination Certificate

active

06865194

ABSTRACT:
A strain-isolated bragg grating temperature sensor includes an optical sensing element20,600which includes an optical fiber10having at least one Bragg grating12disposed therein which is encased within and fused to at least a portion of a glass capillary tube20and/or a large diameter waveguide grating600having a core and a wide cladding and having the grating12disposed therein, which senses temperature changes but is substantially not sensitive to strains on the element caused by the fiber or other effects. Light14is incident on the grating12and light16is reflected at a reflection wavelength λ1. The shape of the sensing element20,600may be other geometries and/or more than one concentric tube may be used or more than one grating or pair of gratings may be used or more than one fiber or optical core may be used. At least a portion of the element20,600may be doped between a pair of gratings150,152, disposed therein to form a temperature tunable laser or the grating12or gratings150,152may be constructed as a temperature tunable DFB laser disposed in the element. Also, the element may have an inner or outer tapered regions22,27, respectively, to provide strain relief and/or added pull strength for the fiber10. Further, the fiber10and the tube20may be made of different coefficients of thermal expansion for increased sensitivity.

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