Fibre Bragg gratings target strain measurements in harsh environments
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Furthermore, multiplexing many sensors on a single fibre is possible, thus reducing both installation complexity and weight, claims the manufacturer. As the fibre is immune to the effects of EMI, the range of possible applications where electric sensors are not suitable is vast. It has even been proven to work whilst bombarded with gamma and proton radiation and can operate effectively in temperatures from cryogenic to 200ºC.
Perhaps most importantly and unlike electric strain gauged sensors, optical fibre based sensors do not require a recalibration once installed. It is possible to return to them after weeks, months or years and simply plug in an instrument to read the relative change of strain since the last visit.
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