A capnometer is disclosed with a light sourse for irradiating a respirtory gas, a thermal detector for sensing the transmission of the infrared radiation, a switch device for turning the radiation source on and off in a predetermined period, a memory device for storing output from the thermal...http://www.google.fr/patents/US5728585?utm_source=gb-gplus-shareBrevet US5728585 - Capnometer
