Two-wavelength type respiratory gas concentration measuring appa

Details Two-wavelength type respiratory gas concentration measuring appa Two-wavelength type respiratory gas concentration measuring appa

1990-02-22

1991-03-05

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250341, 250339, G01J 558, G01J 510, G01J 100

Patent

active

049980181

ABSTRACT:
A two-wavelength type respiratory gas concentration measuring device includes a connector tube which is held in the mouth of an examinee and which has airtight windows, a light source which applies infrared rays through the windows of the connector tube, and first and second filters. The first filter allows the transmission of a light component whose wavelength is such that it is absorbed by the respiratory gas, and the second filter allows the transmission of a light component whose wavelength is such that it is not absorbed by the respiratory gas. A photodetector converts the infrared rays transmitted through the filters into an electric signal. A first detector receives the electric signal and detects the light output of the first filter. A second detector receives the electric signal and detects the light output of the second filter. A power computing circuit performs a power computation of the output of the second detector with a power exponent m. A divider circuit divides the output of the first detector by the output of the first power computing circuit. A DC level detector detects the DC level of the photodetector when no infrared rays are applied. A second power computing circuit performs a power computation of the output of the DC-level detector with a power exponent of 2(m-1). A multiplier circuit multiplies the output of the second power computing circuit by the output of the divider.

REFERENCES:
patent: 4067320 (1978-01-01), Olsson et al.
patent: 4314564 (1982-02-01), Albarda
patent: 4522204 (1985-06-01), Kurahashi et al.
patent: 4587427 (1986-05-01), Talbot et al.
patent: 4914720 (1990-04-01), Knodle et al.

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