Infrared breath analyzer with calibration provisions and related

Details Infrared breath analyzer with calibration provisions and related Infrared breath analyzer with calibration provisions and related

1993-07-09

1995-06-06

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2502521, G01D 1800, G01N 2161, G01N 3700

Patent

active

054224853

ABSTRACT:
A calibration device, method and apparatus is provided for checking calibration of a breath alcohol measuring instrument. A silicon wafer with an anti-reflective silicon monoxide coating on both sides is used to attenuate the infrared radiation in the range of 3.35 to 3.80 microns wavelength in a manner to simulate the attenuation caused by a breath sample containing 0.10 BrAC. A comparison of the signal generated by the attenuation at a wavelength of approximately 3.48 microns is made to the baseline signal obtained before placing the calibration disk in the IR beam path and accurately simulates the breath sample. The related breath alcohol measuring method and apparatus provides for the positioning of the composite disk in the path between the infrared source and receiver. A computer compares the signals and performs the calibration check, as well as the actual BrAC analysis.

REFERENCES:
patent: 3825756 (1974-07-01), Weiss
patent: 4268751 (1981-05-01), Fritzlen et al.
patent: 4692621 (1987-09-01), Passaro et al.

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