In a respiratory air flow measuring monitor, a subassembly for analyzing certain respiratory gases through infrared spectroscopy includes an infrared emitter and an infrared detector, the amount of energy detected by the detector corresponding to the concentration of the gas selected for analysis. The...http://www.google.com.tw/patents/US20020103444?utm_source=gb-gplus-share專利 US20020103444 - Respiratory measurement system with continuous air purge
