We present fiber Bragg grating pressure sensors in air-hole microstructured fibers for high-temperature operation above . An ultrafast laser was used to inscribe Type II grating in two-hole optical fibers. The fiber Bragg grating resonance wavelength shift and peak splits were studied as a function of external hydrostatic pressure from . The grating pressure sensor shows stable and reproducible operation above . We demonstrate a multiplexible pressure sensor technology for a high-temperature environment using a single fiber and a single-fiber feedthrough.
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