Athermal sensing with optical fibre Bragg gratings and long-period gratings

Swart, Pieter L.
May 2005
South African Journal of Science;May/Jun2005, Vol. 101 Issue 5/6, p278
Academic Journal
This paper presents a brief overview of two techniques to circumvent the large temperature sensitivities of fibre Bragg gratings and long-period gratings in sensing applications. The first technique employs the different temperature dependencies of the effective refractive indices of the core and cladding modes in two different types of optical fibre in a long-period grating Michelson interferometer. In the second sensor, both torsion and temperature measurements are possible with only two fibre Bragg gratings by exploiting the geometrical dependence of the strain in a shaft exposed to pure torque.


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