Gas diffusion measurement using hollow-core photonic bandgap fiber

Long period gratings in air-core photonic bandgap fibers

“…[6][7]. The hollow-core characteristic of the PBFs also allow strong light/material interaction inside the fiber-core over an extended length, which offers a new platform for developing ultra-sensitive and distributed gas and liquid sensors [8][9] and for studying nonlinear optics for gases [10]. To increase the impact of the technology, in-fiber components such as wavelength/polarization selective filters are required for manipulating light of different wavelengths/polarizations.…”

Gas detection with micro- and nano-engineered optical fibers

“…In 2004, Hoo et al reported online the results of the experimental investigation on gas diffusion measurement with HC-PBGF [32]. After a short while, Ritari et al reported the demonstration of high sensitivity gas sensing using HC-PBGFs with transmission windows cnetred at 1300 and 1500 nm respectively with which detection of C 2 H 2 , HCN, CH 4 and NH 3 gas was performed [33].…”

“…Gas detection based on absorption spectroscopy with IG-PCFs was proposed by Monro et al in 1999 [29] and experimentally demonstrated by Hoo et al in 2002 [30]. Afterwards, numerous designs and configurations of MOF based gas sensors have been reported [31][32][33][34][35], aiming to develop sensors with better sensitivity and distributed detection capability.…”

Advances in optical fiber Bragg grating sensor technologies

“…One is to employ hollow core MOFs to maximize or enhance the overlap between guided light and gas. Y. L. Hoo et al firstly proposed gas diffusion measurement using the hollow-core photonic bandgap fiber [40], almost at the same time T. Ritari et al addressed a paper on gas sensing using the air-guided photonic bandgap fiber [26]. The other one is to use solid core or suspended core MOFs [41][42][43] in which the light is guided by total internal reflection and interacts with samples via evanescent waves.…”