Optical fibre distributed LHD with SMA element for discrete alarm
AssigneeKidde Technologies, Inc.
InventorsPaul D. Smith, Paul Rennie, Beth A. Dutson
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Abstract
A temperature sensing system 10 comprises an optical waveguide 102, a shape memory alloy (SMA) element 106a, and an interrogator 12. The SMA element 106a is deformable as a function of temperature and at least partially surrounds the optical waveguide 102. The interrogator 12 is configured to detect distributed temperature along the optical waveguide 102 using spectroscopy and to detect strain in the optical waveguide 102 induced by deformation of the SMA element 106a to identify local hot spots along the optical waveguide 102.
Claims13
A temperature sensing system comprising:
- an optical waveguide;
- a shape memory alloy (SMA) element deformable as a function of temperature, and at least partially surrounding at the optical waveguide;
- and
- an interrogator configured to detect distributed temperature along the optical waveguide using spectroscopy and configured to detect strain in the optical waveguide induced by deformation of the SMA sheath to identify local hot spots along the optical waveguide.
The temperature sensing system of any preceding claim, wherein the spectroscopy is strain-insensitive, and wherein detecting strain comprises polarization-based or intensity-based strain sensing.
Dependencies are inferred from the claim text.