Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1979-11-06
1983-05-17
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250344, G01N 2126
Patent
active
RE0312460
ABSTRACT:
A relationship exists between the concentration of ethanol in human breath and blood. Ethanol absorbs infrared 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: 3968367 (1976-07-01), Berg
patent: 3969626 (1976-07-01), Saltzman
Adrian Werner K.
Borkenstein Robert F.
BDT Buro-und Datentechnik GmbH
Willis Davis L.
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