NCRR uses long wave and mid wave infrared cameras to measure the respiration waveform and expired CO2 concentration without any physical contact with the patient.  The primary use for these measurements is to replace traditional sensors during sleep studies to allow the patients a more natural sleep experience.  The respiration method relies on detecting the temperature difference at the nostrils during inhalation (cooler) and exhalation (warmer).  The CO2 concentration method uses the spectral response of CO2 to detect the CO2 levels.  The images included here are from samples during internal testing.  The respiration waveform measurements have been testing during sleep studies in the sleep clinic and the CO2 concentration measurements are in bench testing now.