发明名称 |
GAS DETECTION METHOD AND GAS DETECTOR DEVICE |
摘要 |
The gas detector device comprises at least a VCSEL source (34, 36) and at least a light sensor (54, 56) for detecting a light beam (50, 52) having passed through a sample chamber (48) containing a given gas to be detected. The sensor is a photodiode in a first embodiment and its detection signal is time derivated by an electronic derivator (64) and then provided to two lock-in amplifiers (84, 86) in order to generate a F-detection and a 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. In a second embodiment, the source is a pyroelectric sensor which directly provides a detection signal proportional to the time derivate of the light beam incident on this sensor. In this last case, the electronic derivator is thus eliminated. |
申请公布号 |
WO2005026705(A1) |
申请公布日期 |
2005.03.24 |
申请号 |
WO2004EP08584 |
申请日期 |
2004.07.30 |
申请人 |
IR MICROSYSTEMS S.A.;WILLING, BERT;KOHLI, MARKUS;SEIFERT, ANDREAS |
发明人 |
WILLING, BERT;KOHLI, MARKUS;SEIFERT, ANDREAS |
分类号 |
G01N21/31;G01N21/35;G01N21/39 |
主分类号 |
G01N21/31 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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