Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1997-07-24
1999-07-13
Font, Frank G.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
422 8205, G01J 328, G01N 2129
Patent
active
059234210
ABSTRACT:
A chemical detector comprises: an array of sensing elements, each having a characteristic physical parameter and a coating exhibiting a preferential adsorption of a chemical to be sensed; a chamber for exposing the coatings to an unknown sample of a chemical to be analyzed, the coatings adsorbing the chemical if present in the sample; a source of a monochromatic spectrum for radiating the array with different monochromatic wavelengths; and, a controller for recording signals representative of the physical parameter of the sensing elements responsive to the radiation. A method for sensing chemicals comprises the steps of: preferentially adsorbing a chemical to be sensed onto an array of sensing elements having a characteristic physical parameter; exposing the coatings to an unknown sample of a chemical to be analyzed, the coatings adsorbing the chemical if present in the sample; radiating the sensing elements with different monochromatic wavelengths; and, measuring changes of the physical parameter due to the adsorbing. The measurable changes of the physical parameter due to the adsorbing define a unique photothermal signature of a detected chemical. The arrays can be linear or multi dimensional, for example two dimensional.
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Datskos Panagiotis G.
Rajic Slobodan
Font Frank G.
Lockheed Martin Energy Research Corporation
Smith Zandra V.
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