| Original Articles |
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Gas Sensor Using a Robust Approach under Time Multiplexing Scheme with a Twin Laser Chip for Absorption and Reference |
| ZHANG Yong-Gang, GU Yi, Zhang Xiao-Jun, LI Ai-Zhen, TIAN Zhao-Bing |
| State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050 |
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| Cite this article: |
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ZHANG Yong-Gang, GU Yi, Zhang Xiao-Jun et al 2008 Chin. Phys. Lett. 25 3246-3249 |
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Abstract A tunable diode laser absorption spectroscopy nitrous oxide gas sensor at 2.1 micrometres using one antimonide twin laser chip and one InGaAs photodiode is demonstrated, in which time multiplexing techniques are adopted to acquiring both the absorption and reference signal in a robust fluctuation tolerable scheme. Electronics in analogue modality is developed to extracting absorption information and compensating for fluctuations, resulting in a direct analogue voltage output corresponding to the target gas concentration in real time. The performance of the gas sensor is evaluated experimentally, the validity and feasibility of this scheme is also discussed
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| Keywords:
42.55.Px
42.62.Fi
85.60.Dw
52.25.Os
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Received: 28 June 2008
Published: 29 August 2008
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| PACS: |
42.55.Px
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(Semiconductor lasers; laser diodes)
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42.62.Fi
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(Laser spectroscopy)
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85.60.Dw
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(Photodiodes; phototransistors; photoresistors)
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52.25.Os
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(Emission, absorption, and scattering of electromagnetic radiation ?)
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