Enhanced Sensitivity of FBG Pressure Sensor Using Thin Metal Diaphragm

A highly sensitive fiber Bragg grating diaphragm pressure transducer

“…The solid line shows the average transfer function. The pressure transducer has an average sensitivity of 0.116 nm/kPa, which compares favorably with the 0.048 nm/kPa transducer based on metal bellows, reported by Song et al [26], and the 0.031 nm/kPa diaphragm pressure transducer, reported by Vengal Rao et al [18].…”

“…Diaphragm pressure transducers incorporating FBGs bonded to a metallic diaphragm have been designed, tested and reported [13,18,14,12]. Typically, the Young's modulus and physical dimensions of the diaphragm are much greater than that of the fiber, and in turn, of the grating.…”

“…By using two FBGs and analyzing the difference in the wavelength shift, the temperature sensitivity was effectively eliminated [12]. Similarly, other groups such as Vengal Rao et al [13] and Xiong et al [14] have also described diaphragm type FBG pressure sensors where the FBG is bonded perpendicular to the diaphragm surface with a U-shaped clamp. They report a sensitivity of 31.67 nm/ MPa and 3.55 nm/MPa, respectively.…”

Fiber Bragg Grating Sensors for Mainstream Industrial Processes

“…They report a sensitivity of 31.67 nm/MPa [67,68]. Xiong et al [69] designed, simulated, and tested a similar sensor to that proposed by Pachava et al which had a sensitivity of 3.55 nm/MPa.…”