Capnometer

Details Capnometer Capnometer

1996-02-26

1998-03-17

Alexander, Lyle A.

Chemistry: analytical and immunological testing

Oxygen containing

Inorganic carbon compounds

422 84, G01N 33497

Patent

active

057285853

ABSTRACT:
A capnometer is disclosed with a light sourse for irradiating a respirtory gas, a thermal detector for sensing the transmission of the infrared radiation, a switch device for turning the radiation source on and off in a predetermined period, a memory device for storing output from the thermal deterctor, and a control device for picking up a maximum value of the detection signal from the thermal detector for the present inspiration phase. The maximum value is stored in the memory device and the difference is calculated between a subsequently issued detection signal and the stored maximum value to compensate for drift that has occurred in the thermal detector.

REFERENCES:
patent: 4067320 (1978-01-01), Olsson et al.
patent: 4648396 (1987-03-01), Raemer
patent: 4653498 (1987-03-01), New, Jr. et al.
patent: 5281817 (1994-01-01), Yelderman et al.
patent: 5401966 (1995-03-01), Gray et al.

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