A noncontact infrared tympanic thermometer which does not require environmental stabilization or waveguide temperature control because it utilizes an optically stabilized infrared detector for detecting the infrared energy emitted by the tympanic membrane. The optical stabilization renders the instrument...http://www.google.de/patents/US5159936?utm_source=gb-gplus-sharePatent US5159936 - Noncontact infrared tympanic thermometer
