High-sensitivity pressure sensor based on fiber Bragg grating and metal bellows

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].…”

High-Resolution Fibre Bragg Grating (FBG) Pressure Transducer for Low-Pressure Detection

“…The obtained resolution was much higher than any of the reported works as summarised in Table 1. The sensitivity of the proposed pressure transducer was 38,717 times much higher than the bare FBG [8], three times much higher than the polymer half-filled metal cylinder [20], 346 times much higher than the cantilever structure [13] and more than twice much higher than the metal bellows structure [23]. The Bragg wavelength shifted towards temperature effects was evaluated by submerging the pressure transducer in the water at a temperature of 30.…”

“…Regarding this, various encapsulation methods with diverse temperature compensation techniques were reported. Polymer filled structure [17][18][19][20], cantilever beam structure [13,21], metal bellows structure [1,22,23] and diaphragm-based structure [10,16,[24][25][26] appeared to be favourable to most researchers. Pachava et al [1] bonded two FBGs to a metal bellow, where one of the FBGs is to sense the pressure strain while the other is to compensate the temperature variations.…”

Fiber Bragg Grating Sensors for Mainstream Industrial Processes

“…An FBG pressure sensor embedded within metal bellows was reported by Song et al [62]. As the metal bellows had a lower spring rate than the fiber, a sensitivity of 48 pm/kPa was reported.…”