Determination of the alcohol content of blood

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive

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250344, G01N 2126

Patent

active

040577244

ABSTRACT:
A relationship exists between the concentration of ethanol in human breath and blood. Ethanol absorbs infra-red energy in the region of 3.46 mu. In this method the concentration of ethanol in breath is measured by collecting a sample in a chamber and passing through it a filtered, directional, and interrupted beam of infra-red energy at 3.46 mu. The path length is fixed. The exit energy falls on a tuned radiant energy detector. This beam is compared with a similar beam of radiant energy not capable of being absorbed by ethanol. The two signals are fed into a differential amplifier which activates a servo-system that moves a tapered radiant-energy absorbing medium in the path of one of the energy beams until a null condition is achieved. The distance the tapered medium must be moved to establish the null condition is measured by a potentiometer operably associated with it. The potentiometer provides a signal that can be displayed by an analog or digital device calibrated directly in units of blood or breath ethanol concentration.

REFERENCES:
patent: 3569696 (1971-03-01), Karlson
patent: 3792272 (1974-02-01), Harte et al.
patent: 3969626 (1976-07-01), Saltzman

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