BREATH ALCOHOL DETECTOR WITH IMPROVED COMPENSATION FOR ENVIRONMENTAL VARIABLES

摘要

A gas content detector (22) measures and compensates for distance between the gas source and the detector, the atmospheric pressure, and the temperature by way of a distance sensor (64), a pressure sensor (32), and a temperature sensor (28). Gas concentration information is calculated using these compensation factors and a signal obtained from an electrochemical fuel cell in the detector (22) which is indicative of the amount of gas contained in the sample. The detector also includes a reciprocally acting electromagnetically energized motor which drives a diaphragm pump (20) to draw the sample into the detector. This device can be used effectively as a breath alcohol detector to estimate the blood alcohol content of an individual.