Respiratory gas concentration measuring apparatus

Details Respiratory gas concentration measuring apparatus Respiratory gas concentration measuring apparatus

1983-06-08

1985-06-11

Howell, Kyle L.

Surgery

Truss

Pad

356418, 250343, A61B 500

Patent

active

045222045

ABSTRACT:
A respiratory gas concentration measuring apparatus includes a chopper having a first filter for passing therethrough light from a light source and having a first wavelength which can be absorbed by a gas to be measured and a second filter for passing therethrough light from the light source and having a second wavelength which cannot be absorbed by the gas. The chopper is rotatable to position the first and second filters alternately in a light path. The light having passed through the filters is converted by a photodetector into an electric signal. A first detector detects an output from the first filter based on the electric signal, and a second detector detects an output from the second filter based on the electric signal. The apparatus has a power computing circuit for raising an output from said second detector to an mth power, m being a power exponent preset in the power computing circuit, and a divider circuit for dividing an output from the first detector by an output from the power computing circuit. The power exponent m is the ratio between a temperature-dependent coefficient .theta..sub.1 of the output of the first detector which varies exponentially with a temperature variation and a temperature-dependent coefficient .theta..sub.2 of the output of the second detector which varies exponentially with a temperature variation.

REFERENCES:
patent: 3724954 (1973-04-01), Dreyfoos, Jr.
patent: 4067320 (1978-01-01), Olsson et al.
patent: 4312593 (1982-01-01), Baker et al.

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