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	Gas detection method and gas detection device
	WILLING BERT; KOHLI MARKUS; ANDREAS SEIFERT
	2008-08-01
著作权人	IR MICROSYSTEMS SA
专利号	IN1130MUM2006A
国家	印度
文献子类	发明申请
其他题名	Gas detection method and gas detection device
英文摘要	The gas detector device comprises at least a VCSEL source and at least a light sensor for detecting a light beam having passed through a sample chamber containing a given gas to be detected. The detection signal of the sensor directly provided to or is time derivated by an electronic derivator and then provided to respective lock-in amplifiers in order to generate a two different 2f-detection, f being the frequency of a wavelength modulation of the source, and thus to provide two corresponding measuring signals the division of which gives a precise value of the gas concentration. The invention uses at least a first modulation reference signal at twice and a second modulation reference signal at twice of the modulation frequency of the laser source. Providing at least a first 2f modulation reference signal has advantages over the prior art, because by using such a reference modulation signal it is possible measure the absolute intensity and therefore to receive the same result at different temperatures or at mode hopping of the laser. A further advantage is that the measurement accuracy is independent from the gas concentration.
公开日期	2008-08-01
申请日期	2006-07-17
状态	未确认
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/82346]
专题	半导体激光器专利数据库
作者单位	IR MICROSYSTEMS SA
推荐引用方式 GB/T 7714	WILLING BERT,KOHLI MARKUS,ANDREAS SEIFERT. Gas detection method and gas detection device. IN1130MUM2006A. 2008-08-01.

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