Accession Number : ADD011879

Title :   Improved Chemical Sensor Matrix.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Ballato,A

Report Date : 07 Aug 1985

Pagination or Media Count : 15

Abstract : An improved chemical sensor matrix is provided for sensing the presence of chemical agents by chemo-electronic means. The chemical sensor matrix is comprised of a plurality of resonators embedded in a single monolithic piece of piexoelectric crystal. The resonators are arranged in rectangular row and column configuration including m rows and n columns, each of the resonators being separated from its neighboring resonators by distances such that the resonant energies do not overlap. Each of the resonators is provided with etch tunnels that are coated within by a chemical substance particular to that resonator and different from the chemical substance used to coat any other resonator, the chemical substance being sensitive to a chemical agent to be detected so that when the chemical agent reacts with the chemical substance the frequency f subscript mn changes. Each of the rows of resonators bears a metallic electrode stripe for that row, and each of said columns of resonators bears a metallic electrode stripe for that column. Two diode arrays are positioned on the periphery of the crystal for addressing the individual row electrode stripes and the individual column electrode stripes so that the desired resonator can be activated by connecting the stripe corresponding to its row address and the stripe corresponding to its column address to suitable active oscillator circuitry and signal processing means. The resonators f subscript mn can then be interrogated sequentially and frequency change registered.

Descriptors :   *PATENT APPLICATIONS, *CHEMICALS, *CHEMICAL AGENTS, *CHEMICAL DETECTION, *DETECTORS, ARRAYS, CIRCUITS, CONFIGURATIONS, DIODES, ELECTRODES, ENERGY, FREQUENCY, OSCILLATORS, RECTANGULAR BODIES, RESONANCE, RESONATORS, SIGNAL PROCESSING, STRIPES, ELECTRONIC EQUIPMENT

Subject Categories : Chemical, Biological and Radiological Warfare

Distribution Statement : APPROVED FOR PUBLIC RELEASE