Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1987-08-13
1989-08-08
Envall, Jr., Roy N.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
128736, G01K 700
Patent
active
048547301
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.
REFERENCES:
patent: 3581570 (1971-06-01), Wortz
patent: 3832902 (1974-09-01), Usami et al.
patent: 3915003 (1975-10-01), Adams
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