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US 5,672,008 AGranted
Reconfigurable multipoint temperature sensor
AssigneeThomson-CSF
InventorsPhilippe Bonniau, Jean Chazelas, Marc Turpin
Life of this patent
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Abstract
A temperature sensor having a light fiber connecting a light source and a reflectometer. Temperature measurement zones are formed by sensing elements made of shape-memory alloy. The elements exert a stress on the fiber when they are subjected to an increase in temperature due to their memorized state. The change in temperature is detected by the reflectometer.
Claims5
A temperature sensor comprising:
- a light source;
- an optical fiber receiving light from said light source;
- a time domain reflectometry read device connected to said optical fiber for measuring a variation in light flux;
- and
- a plurality of elements made of shape-memory alloy arranged on the optical fiber, each element having a plurality of turns arranged alternately on opposite sides of the optical fiber, wherein each element exerts essentially no stress on the fiber when it is at a temperature on one side of a transition temperature and exerts a stress on the fiber when it is at a temperature on another side of the transition temperature so that the optical fiber is subjected to stress from opposite directions form adjacent turns.
2 more elements
Dependencies are inferred from the claim text.