Noncontact infrared tympanic thermometer

Details Noncontact infrared tympanic thermometer Noncontact infrared tympanic thermometer

G - Physics

01

J

G01J 5/12 (2006.01) A61B 5/00 (2006.01) G01J 5/10 (2006.01) G01J 5/18 (2006.01) G01K 7/02 (2006.01) G01K 7/04 (2006.01)

Patent

CA 2146136

A noncontact infrared tympanic thermometer which does not require environmental stabilization or waveguide tempera- ture control because it utilizes an optically stabilized infrared detector for detecting the infrared energy emitted by the tym- panic membrane. This stability is accomplished by locating a neutral density filter (164) over half of the optical aperture (162) of the detector package (16) such that the neutral density filter (164) "shadows" only one of two thermopile channels (163) for detecting the infrared energy emitted by the tympanic mem- brane The two thermopile channels (163) are connected in seri- es opposition such that any optical signal equally present in both channels will yield a zero net output. Since the infrared en- ergy emitted by the walls (161) of the detector package (16) reach each detector (163) equally, the effects of these emissions on the temperature measurement are eliminated.

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