The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 1989
Filed:
Aug. 13, 1987
Jacob Fraden, Hamden, CT (US);
Other;
Abstract
An electronic radiation thermometer utilizing temperature sensitive resistor (thermistor) as a radiometer sensor. The sensor is heated to higher than target temperature. Its resistance is maintained constant during measurement by a control circuit. Electric power required to balance radiation heat losses is proportional to net flux, which, in turn, depends on temperature of a target. That power value is processed by an electronic circuit to calculate target temperature. The thermometer probe does not absorb infrared radiation but emits it toward the target. The thermometer comprises reflective cavity with thermistor placed in a focal point, self-balancing resistive bridge with control amplifier and an electronic processing circuit. For the medical application, the thermometer is built in an elongated form and uses a disposable speculum, which is placed over the reflective cavity. Medical thermometer can take either core temperature from ear canal or mouth, or surface skin temperature.