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An Innovative Gas Sensor with On-Chip Reference Using Monolithic Twin Laser |
| ZHANG Yong-Gang;TIAN Zhao-Bing;ZHANG Xiao-Jun;GU Yi;LI Ai-Zhen;ZHU Xiang-Rong;ZHENG Yan-Lan;LIU Sheng |
| 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, TIAN Zhao-Bing, ZHANG Xiao-Jun et al 2007 Chin. Phys. Lett. 24 2839-2841 |
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Abstract An innovative gas sensor with on-chip reference using a monolithic twin laser is proposed. In this sensor a monolithic twin laser generates two closer laser beams with slight different wavelengths alternatively, one photodiode is used to catch both absorption and reference signals by time division multiplexing. The detection of nitrous oxide adopting this scheme using a 2.1μm antimonide laser and an InGaAs photodiode has been demonstrated experimentally with detection limit below 1ppm. Using this on chip reference scheme the fluctuations from the optical path and devices can be compensated effectively; the sensor system is simplified distinctly.
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| Keywords:
42.55.Px
85.60.Dw
52.25.Os
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Received: 26 June 2007
Published: 20 September 2007
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| PACS: |
42.55.Px
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(Semiconductor lasers; laser diodes)
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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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