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Light travelling in an optical fibre may be directly modulated by external parameters such as pressure, strain, temperature, etc. Thus the fibre may form the basis of a transducer involving neither moving parts nor electrical connections. Another class of transducers uses the fibre as a means of guiding light from a monitoring point to the measuring point where the light is externally modulated. This paper presents a review of the current status of optical fibre sensors and discusses their future potential.