Accession Number : ADD017937

Title :   Smart Sensor System and Method Using a Surface Acoustic Wave Vapor Sensor Array and Pattern Recognition for Selective Trace Organic Vapor Detection.

Descriptive Note : Patent, Filed 2 Nov 92, patented 21 Nov 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Rose-Pehrsson, Susan L ; Di Lella, Daniel ; Grate, Jay W

Report Date : 21 Nov 1995

Pagination or Media Count : 30

Abstract : A method and a system using that method are provided which employ a pattern recognition algorithm to improve sensitivity in detecting hazardous vapors. The algorithm enables the discrimination of vapors of interest from non-hazardous substances at higher concentrations in varying relative humidity. A weight vector is generated corresponding to a N-space representation of a class comprising known vapors of interest, and a N-space representation of the unknown vapor is used to generate an unknown pattern vector. By calculating the dot product of the unknown pattern vector and the weight vector a determination can be made as to whether the unknown vapor is within the class. The weight vector is generated by selecting a training set comprising a subset of the known vapors of interest and background vapors and generating an N-space representation of the training set so as to create an associated weight vector.

Descriptors :   *DETECTORS, *HAZARDS, *VAPORS, *ORGANIC MATERIALS, *ACOUSTIC ARRAYS, *PATTERN RECOGNITION, *TRACE ELEMENTS, *PATENTS, *SURFACE ACOUSTIC WAVE DEVICES, ALGORITHMS, SENSITIVITY, CONCENTRATION(COMPOSITION), ARTIFICIAL INTELLIGENCE, DISCRIMINATION, HUMIDITY

Subject Categories : Organic Chemistry
      Physical Chemistry
      Line, Surface and Bulk Acoustic Wave Devices
      Cybernetics
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE