Enhanced sensitivity of fiber Bragg grating hydrogen sensor using flexible substrate

Improved performance of fiber optic hydrogen sensor based on WO3-Pd2Pt-Pt composite film and self-referenced demodulation method

“…Therefore, the value of I 1 /I 2 increases quickly with the increase of hydrogen concentration in the gas chamber. The response time for hydrogen sensor is no more than 20 s at room temperature of 25 • C, which is a significant improvement when compared with the reported work [12][13][14][15][16][17][18][19][20][21]. The quick response rate of the hydrogen sensor can be attributed to the amorphous structure of WO 3 and intensive optical power focused on the core of single mode fiber.…”

“…Many researches have been focused on exploring hydrogen sensors with alternative solution [4,5]. Optical fiber hydrogen sensing technology [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] is one of the hotspots due to its intrinsic safety and anti-electromagnetic interference. Although these hydrogen sensors have good selectivity, their sensitivities (in air) are still much poorer than that of conventional electrode hydrogen sensor, especially under low hydrogen concentrations.…”

A Robust Fiber Bragg Grating Hydrogen Gas Sensor Using Platinum-Supported Silica Catalyst Film

“…Furthermore, significantly valuable characteristics such as explosion proof and immunity to electromagnetic noise are noteworthy for practical applications. Many types of optical fiber hydrogen sensors have been proposed, including evanescent wave absorption devices [9,10], micromirror optode [11,12], Mach-Zehnder interferometers [13], surface plasmon resonance (SPR) devices [14], and fiber Bragg gratings (FBG) [15][16][17]. Among them, the fiber-optic sensor based on evanescent wave absorption is able to detect the leakage point by time-domain reflectometry using light pulse technique [18].…”

Optical Fiber Grating Hydrogen Sensors: A Review

“…Optical fiber hydrogen sensors can be intrinsically safe as they employ optical signals as a sensing medium, and as such they have attracted much research interest. Several kinds of optical fiber hydrogen sensors, such as evanescent sensors [4,5,6], micro-mirror sensors [7,8], interference sensors [9], surface plasmon resonance (SPR) sensors [10], acoustic resonator sensors [11], and fiber grating sensors [12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35], have been proposed in recent years. Compared to other optical fiber hydrogen sensors, hydrogen sensors based on fiber grating are more suitable for distributed measurement and temperature compensation because of their wavelength multiplexing capability.…”

“…According to classification of hydrogen-sensitive materials, two types of fiber grating hydrogen sensors have been reported. The first kind of fiber grating hydrogen sensor is based on Pd [12,13,14,15,16,17,18,19,20] or Pd alloys [21,22,23,24,25], which can produce volume expansion or optical constant change during hydrogen response. The other type is based on Pt-loaded WO 3 coatings [40,41,42,43,44] or other oxide materials [45] undergoing an exothermic or gasochromic reaction [46,47] in a hydrogen atmosphere.…”