PHOTO ACOUSTIC DETECTOR WITH IMPROVED SIGNAL PROCE

专利名称：PHOTO ACOUSTIC DETECTOR WITH

IMPROVED SIGNAL PROCESSING

发明人：HELWEGEN, Ivon F.,VAN KESTEREN, Hans W.申请号：EP07826949.5申请日：20071102公开号：EP2082214B1公开日：20110713

摘要：A photo, acoustic detector (200) for detecting a concentration of a sample in asample mixture. The photo acoustic detector (200) comprises a light source (101 ) forproducing a. light beam for exciting molecules of the sample and a light modulator (102)for modulating the light beam for generating pressure variations in the sample mixture,an amplitude of the pressure variations being a measure of the concentration. The photoacoustic detector (200) further comprises a detector element (103) for converting thepressure variations into a detector current and a processing section (106) for processingthe detector current to generate an output signal representing the concentration. Theprocessing section (106) comprises an integrating amplifier for integrating the detectorcurrent, the integrating amplifier being coupled to the detector element (103) via a holdswitch, and a timing circuit for generating a hold signal, SW HOLD, for operating the holdswitch in order to couple the integrating amplifier to the detector element (103) during apredetermined interval of a period of the detector current.

申请人：KONINKL PHILIPS ELECTRONICS NV

地址：NL

国籍：NL

代理机构：Van Velzen, Maaike Mathilde

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