Title: Analysis on measurement of hydrogen concentration in air mixture using 3 omega method

Authors: Dong-Wook Oh

Addresses: Department of Mechanical Engineering, Chosun University, 309 Pilmundaero, Donggu, Gwangju 61452, South Korea

Abstract: Thermal conductivity of hydrogen is the highest compared with that of other gases, and it is approximately seven times greater than that of air. Therefore, several hydrogen concentration detection techniques are based on the thermal conductivity measurement of a sample gas. Measurement of thermal conductivity is susceptible to limitations during the detection of hydrogen in the low-concentration range compared with that of electrochemical or catalytic measurements. However, accurate measurement of hydrogen volume fraction of 4% or greater is possible. Therefore, in this study, the feasibility of a high-spatial resolution thermal conductivity measurement technique, the 3 omega method, was analysed for measurement of a mixture of hydrogen and dry air. The temperature amplitude and phase lag at the microheater on a polymer and a glass substrate are calculated as a function of input heating frequency and hydrogen concentration.

Keywords: hydrogen concentration; thermal conductivity of gas; 3 omega method; microheater based sensor; hydrogen; air mixture.

DOI: 10.1504/IJNT.2022.122371

International Journal of Nanotechnology, 2022 Vol.19 No.1, pp.88 - 93

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 16 Apr 2022 *

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