Breath testing system

Details Breath testing system Breath testing system

1978-03-07

1979-08-07

Gill, James J.

Measuring and testing

Gas analysis

By vibration

422 84, 422 95, G01N 2704

Patent

active

041633830

ABSTRACT:
A breath tester includes an electronic detector providing an information signal with an amplitude level which varies as a function of the alcohol content in the breath under test. An anomaly detector circuit stores a signal related to the peak of the information signal, and continually compares this peak value with the instantaneous value of the information signal. When the difference between the peak signal level and the instantaneous signal level exceeds a preset amount, the output display of the breath tester is modified to indicate the analysis process has been disturbed by an anomalous chemical substance.

REFERENCES:
patent: 3600134 (1971-08-01), Noller
patent: 3695848 (1972-10-01), Taguchi

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