Apparatus for enhancing the response of a biometric sensor

Details Apparatus for enhancing the response of a biometric sensor Apparatus for enhancing the response of a biometric sensor

1996-05-01

1997-04-29

Alexander, Lyle A.

Chemistry: analytical and immunological testing

Optical result

436 81, 436120, 436134, G01N 2177

Patent

active

056248482

ABSTRACT:
The present invention provides an apparatus and method for enhancing the response of a biometric sensor for sensing toxins by measuring the rate of change of sensor readings. An LED, optically coupled to the sensor and a photodiode, transmits light through the sensor to the photodiode. The photocurrent from the photodiode is converted to a digital sensor reading value proportional to the darkness of the sensor and is loaded into a microprocessor. In the microprocessor, the sensor readings are essentially differentiated to determine the rate of change of the sensor readings. The rate of change information is used to trigger an alarm condition indicative of a predetermined level of sensed toxins.

REFERENCES:
patent: 4464653 (1984-08-01), Winner
patent: 5063164 (1991-11-01), Goldstein

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