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Appl. Sci. 2018, 8(9), 1630; https://doi.org/10.3390/app8091630

Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity

1
Condensed-Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150001, China
2
Physical Science and Technology, Heilongjiang University, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Received: 2 August 2018 / Revised: 2 September 2018 / Accepted: 7 September 2018 / Published: 12 September 2018
(This article belongs to the Special Issue State-of-the-art Laser Gas Sensing Technologies)
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Abstract

The relationship between absorption and gas concentration was studied using a diffuse integrating cavity as a gas cell. The light transmission process in an arbitrary diffuse cavity was theoretically derived based on a beam reflection analysis. It was found that a weak absorption condition must be satisfied to ensure a linear relationship between absorbance and gas concentration. When the weak absorption condition is not satisfied, a non-linear relation will be observed. A 35 × 35 × 35 cm diffuse integrating cavity was used in the experiment. Different oxygen concentrations were measured by detecting the P9 absorption line at 763.8 nm, based on tunable diode laser absorption spectroscopy. The relationship between the absorption signals and oxygen concentration was linear at low oxygen concentrations and became non-linear when oxygen concentrations were higher than 21%. The absorbance value of this transition point was 0.17, which was considered as the weak absorption condition for this system. This work studied the theoretical reason for the non-linear phenomenon and provided an experimental method to determine the transition point when using a diffuse integrating cavity as a gas cell. View Full-Text
Keywords: diffuse integrating cavity; TDLAS; gas detection; non-linearity diffuse integrating cavity; TDLAS; gas detection; non-linearity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhou, X.; Yu, J.; Wang, L.; Zhang, Z. Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity. Appl. Sci. 2018, 8, 1630.

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