@article{KOZIOŁ2025, 
author = {Paweł KOZIOŁ and Piotr BOJĘŚ and Piotr JAWORSKI and Dakun WU and Fei YU and Karol KRZEMPEK},
title = {Enhancing Gas Diffusion in Antiresonant Hollow-Core Fiber Gas Sensors Using Microchannels},
year = {2025},
journal = {Photonic Sensors},
volume = {15},
number = {3},
pages = {250336},
keywords = {Optical fiber sensor, antiresonant hollow core fibers, gas diffusion measurement, microchannel, side-slot},
url = {https://www.sciopen.com/article/10.1007/s13320-025-0753-5},
doi = {10.1007/s13320-025-0753-5},
abstract = {In this paper, we analyze the performance of diffusion-based gas distribution in antiresonant hollow-core fiber-based gas absorption cells. Performed theoretical analysis was based on Fick’s second law using the OpenFOAM® software and finite volume method (FVM), followed by an experimental verification of the obtained simulations. The diffusion time was tested for a 1.25 m long fiber, with laser-micromachined microchannels. Full analysis of the correlation between the microchannel count, position, and separation on the rate at which the fiber-based gas cell was filled with the target gas was presented. Experimental results showed that with the proper microchannel configuration, the purely-diffusion-based gas exchange time in the 1.25 m fiber could be reduced from 6 h, down to 330 s. Obtained results correlated with the simulations, giving perspective for the development and implementation of novel miniaturized passively filled gas absorption cells for compact laser spectrometers.}
}