Infrared thermometer with automatic calibration

Details Infrared thermometer with automatic calibration Infrared thermometer with automatic calibration

1986-01-13

1988-11-15

Lastova, Maryann

Surgery

Truss

Pad

128736, 374129, 374158, G01J 510

Patent

active

047841494

ABSTRACT:
Infrared radiation emitted from tissue surface of body cavity is measured by an infrared sensor located within a probe which generates a signal voltage dependent on the difference in temperature between the tissue and the infrared sensor. An additional ambient sensor measures the ambient temperature of the infrared sensor. The signals of the two sensors are added. To calibrate and eliminate errors, the housing of the device is provided with a chamber shaped to receive the probe and containing a target viewed by the infrared sensor. An error signal is thus generated which is added to the signals of the two sensors when they view the body tissue. A disposable, sanitary cover for the probe is made of a truncated polyethylene member of substantially uniform thickness closed by an end window. A filter in the probe suppresses absorption bands of polyethylene to eliminate errors due to minor variations in cover thickness.

REFERENCES:
patent: 3449121 (1969-06-01), Astheimer
patent: 3581570 (1971-06-01), Wertz
patent: 3673868 (1972-07-01), Beury, III et al.
patent: 3878836 (1975-04-01), Twentier
patent: 3949746 (1976-04-01), Twentier
patent: 4005605 (1977-02-01), Michael
patent: 4343185 (1982-08-01), Knute
patent: 4372690 (1983-02-01), Berman et al.
patent: 4497585 (1985-02-01), Paull et al.
patent: 4572213 (1986-02-01), Kawahara
patent: 4602642 (1986-07-01), O'Hara et al.

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