Recent Advances in Spectroscopic Gas Sensing With Micro/Nano-Structured Optical Fibers

Abstract

With micro- and nano-structured optical fibers, parts-per-million to parts-per-trillion level gas detection has been demonstrated for a range of gases such as methane, acetylene, ethane, carbon monoxide, hydrogen, and oxygen. We review the recent development in optical fiber gas cells and gas detection systems based on direct absorption, photothermal, photoacoustic, and stimulated Raman spectroscopies.

In Situ All-Fiber Remote Gas Sensing Strategy Based on Anti-Resonant Hollow-Core Fiber and Middle-Hole Eccentric-Core Fiber

“…However, conventional light-gas interaction platforms typically use large free-space gas cells as sensing elements. These cells are size-constrained and susceptible to degradation in the optical coatings due to ageing, which affects long-term stability [7]. In Photonics 2024, 11, 301 2 of 10 contrast, optical transmission and remote detection capabilities based on optical fibers can make the detection system more flexible and stable [8].…”

A theoretical analysis of performance enhancement of SPR sensor based on ZnO and BaTiO3 for NH3 detection

“…Optical sensing technology is one of the preferred methods for gas sensing applications. In recent decades, various optical techniques such as ellipsometry, spectroscopy, interferometry and surface plasmon resonance (SPR) are used for chemical and bio samples and gas sensing [2][3][4][5][6][7][8]. Compared to other optical methods, SPR sensors offer many advantages, including sensing at room temperature, good selectivity, low detection limits, and easy fabrication of samples.…”

Sensing Performance of Ethanol Microfiber Probe Augmented by ZnO Nanosheet and UV Glue Film

“…Currently, practical optical fiber sensor technology is mainly limited by the repeatability of processing technology and the expensive components of demodulation equipment [23]. When gas molecules are detected by gas sensors made from sensitive nanomaterials and optical fiber structures, the effective refractive index of the function material film will become different, thereby changing the optical signal parameters in the optical fiber [24][25][26]. Therefore, the gas concentration in the environment can be determined by demodulating the change to the optical parameters of frequency domain interference spectra (recorded by an optical spectrum analyzer) or time domain variation waveforms (obtained by an optoelectronic detector and oscilloscope) [27,28], including attributes such as phase and intensity (power).…”