A technique for temperature-insensitive displacement measurement using a single fiber Bragg grating (FBG) based on
strain-gradient-induced reflection spectrum bandwidth modulation and optical power detection is demonstrated. Linear
displacement measurement up to 20mm with displacement resolution of 0.054 mm and thermal stability of < 0.8 % F.S.
for temperature range from 20 °C to 80 °C are respectively achieved without any temperature compensation.i
Temperature-insensitive pressure measurement using a single fiber Bragg grating (FBG) based on reflection spectrum
bandwidth modulation and optical power detection is proposed. A specially designed double-hole cantilever beam
(DHCB) is used to provide pressure induced axial strain gradient along the sensing FBG and further modulate the
reflection bandwidth of the grating. The bandwidth modulation immunes to spatially uniform temperature effect and the
pressure can be unambiguous determined by reflected optical power measurement, avoiding the complex wavelength
interrogation system. The thermal fluctuate of the system is less than 1.2 % F.S. for temperature range from -10°C to 80
°C without any temperature compensation.
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