Review of Fibre Sensor Techniques for Temperature-Strain Discrimination

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Abstract
This paper reviews techniques for the simultaneous measurement of strain and temperature (?,T) using a single sensing element. Temperature compensation is a familiar problem in instrument design and the sensitivity of optical path length in single-mode fibre for both ? and T was recognised almost simultaneously and is described by a similar analysis [1,2]. Slowly-varying ? measurement is important, e.g. for structural monitoring with embedded sensors. The simplest way of measuring (?,T) is to use physically separate sensors, where one is isolated from strain. Where sensors must be embedded with minimal intrusion, using a second sensor is not feasible. It is those cases, demanding (?,T) measurement with a common sensor, that are the subject of this paper.

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