Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity
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 s...
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MDPI AG
2018-09-01
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| Series: | Applied Sciences |
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| Online Access: | http://www.mdpi.com/2076-3417/8/9/1630 |
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| author | Xue Zhou Jia Yu Lin Wang Zhiguo Zhang |
| author_facet | Xue Zhou Jia Yu Lin Wang Zhiguo Zhang |
| author_sort | Xue Zhou |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-11T08:48:42Z |
| format | Article |
| id | doaj.art-d17d9447992e4872962205fa5a9ee03e |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-11T08:48:42Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-d17d9447992e4872962205fa5a9ee03e2022-12-22T01:14:04ZengMDPI AGApplied Sciences2076-34172018-09-0189163010.3390/app8091630app8091630Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating CavityXue Zhou0Jia Yu1Lin Wang2Zhiguo Zhang3Condensed-Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150001, ChinaPhysical Science and Technology, Heilongjiang University, Harbin 150001, ChinaCondensed-Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150001, ChinaCondensed-Matter Science and Technology Institute, Harbin Institute of Technology, Harbin 150001, ChinaThe 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.http://www.mdpi.com/2076-3417/8/9/1630diffuse integrating cavityTDLASgas detectionnon-linearity |
| spellingShingle | Xue Zhou Jia Yu Lin Wang Zhiguo Zhang Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity Applied Sciences diffuse integrating cavity TDLAS gas detection non-linearity |
| title | Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity |
| title_full | Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity |
| title_fullStr | Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity |
| title_full_unstemmed | Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity |
| title_short | Investigating the Relation between Absorption and Gas Concentration in Gas Detection Using a Diffuse Integrating Cavity |
| title_sort | investigating the relation between absorption and gas concentration in gas detection using a diffuse integrating cavity |
| topic | diffuse integrating cavity TDLAS gas detection non-linearity |
| url | http://www.mdpi.com/2076-3417/8/9/1630 |
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