发明名称 |
LOW COST APPARATUS FOR DETECTION OF NITROGEN-CONTAINING GAS COMPOUNDS |
摘要 |
Nitrogen-containing compounds are detected by chemically converting (210) them to nitrogen dioxide, and detecting (10) the amount of nitrogen dioxide. A semiconductor laser or light emitting diode (132) provides a modulated light (131) in the blue- violet-green wavelength range and a narrow bandwidth photo-acoustic sensor (10) detects the standing waves produced by the absorption of the light by the nitrogen dioxide. The photo-acoustic sensor (10) uses a resonant cavity (161, 182a-b) with a resonant frequency that corresponds to the modulation frequency of the light (131). For detecting nitric oxide, a surface chemical oxidation unit (210) is preferably used to convert the nitric oxide to nitrogen dioxide, using, for example potassium permanganate (KMnO4) filter, or a platinum (Pt) catalyst unit (260). |
申请公布号 |
WO2006114766(A2) |
申请公布日期 |
2006.11.02 |
申请号 |
WO2006IB51288 |
申请日期 |
2006.04.25 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V.;VAN KESTEREN, HANS;VINK, TEUNIS JOHANNES;WILLARD, NICOLAAS PETRUS |
发明人 |
VAN KESTEREN, HANS;VINK, TEUNIS JOHANNES;WILLARD, NICOLAAS PETRUS |
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