Blood Alcohol Measurement

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A BLOOD ALCOHOL MEASUREMENT DEVICE USING A FIXED FREQUENCY PHOTOSPECTROMETER BY LUCILLE J. DURFEE

ABSTRACT There are many people who go out for a night on the town without thinking about the potential dangers of drinking alcohol and then driving. A simple, non-invasive system is needed to test these people before they leave the bar to determine if they are “okay” to drive. The purpose of this project is to study, design ,build, and test a fixed frequency photospectrometer that will test the blood alcohol content of a person non-invasively.

BACKGROUND Over the past decades a new method for measurement has been rapidly envancing. This method is a photonic technique that envolves electromagnetic radiation. Electromagnetic radiation has several forms including visible and infrared light radiation. Visible light radiation ranges from 370nm to 760nm, while infrared ranges from 760nm to approximately 1OE-4nm. Mark A. Arnold at the university of Iowa in Iowa City and Gary W.Small at Ohio University in Athens have been focusing on near-infrared (800nm to 1000nm) absorption spectroscopy as a solution to non-invasive glucose monitoring. Problems that have occurred revolve around the broad absorption signals of near-infrared radiation making it more difficult to identi@ a specific analyte. Arnold estimates that a working device is still five years away. A Biophotonic success is the Pulse Oximeter. It is a ten year old deviqe used to monitor patient’s conditions under anesthesia. It uses two LEDs that emit light at a wavelength of 660nm and 940nm respectively. Oxygenated blood absorbs strongly at 660nm. As cumulative blood oxygenation changes, the ratio of the light transmitted by the two frequencies changes. The unit detects the peaks and valleys, allowing it to separate the arterial blood
0-7803-5078-2/98/$10.00 0 1998 IEEE

signal from the background signal of blood…...

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