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	Gas detection method and gas detection device
	WILLING, BERT; KOHLI, MARKUS; SEIFERT, ANDREAS
	2007-02-27
著作权人	AXETRIS AG
专利号	US7183553
国家	美国
文献子类	授权发明
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	2007-02-27
申请日期	2005-09-15
状态	授权
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/48869]
专题	半导体激光器专利数据库
作者单位	AXETRIS AG
推荐引用方式 GB/T 7714	WILLING, BERT,KOHLI, MARKUS,SEIFERT, ANDREAS. Gas detection method and gas detection device. US7183553. 2007-02-27.

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