Honeywell International Inc.

Peng Jin

Takashi Yamaguchi

Carlos M Morales

Daniel Jerzy Paska

Among other things, this application describes systems and methods for detecting gas using a wide band light source, and at least two narrow band light sensors, wherein each sensor may be operable to detect light at a different range of wavelengths. Additionally, the gas detector device may comprise a color changing indicator operable to react with gas in the air to change color, wherein different gases may react to create different colors, and wherein the sensors detect light reflected by the color changing indicator from the wide band light source. The gas detector device may comprise a processor in communication with the at least two light sensors operable to receive detected reflected wavelength information from the light sensors, and determine the type of gas that reacted with the color changing indicator based on the color detected by the sensors, wherein each color may be associated with a different type of gas.

Gas identification by measuring stain development at multiple specific wavelength regions with narrow band optical sensors

Systems and methods for detecting gas are described that use a wide band light source, and at least two narrow band light sensors. Each sensor may be operable to detect light at a different range of wavelengths. Additionally, the gas detector device may comprise a color changing indicator operable to react with gas in the air to change color. The different gases may react to create different colors, and the sensors detect light reflected by the color changing indicator from the wide band light source. The gas detector device may comprise a processor in communication with the at least two light sensors operable to receive detected reflected wavelength information from the light sensors, and determine the type of gas that reacted with the color changing indicator based on the color detected by the sensors. Each color may be associated with a different type of gas.

An apparatus including a treated tape, an adjustable color source, a photodiode, and a processor is provided. The adjustable color source emits a first radiation toward the treated tape and operates at each of a plurality of different target wavelengths in a spectrum. The photodiode measures a second radiation reflected from the treated tape, and the processor analyzes measurements from the photodiode to determine a peak wavelength from the plurality of target wavelengths. Based on the peak wavelength, the processor determines a color and darkness of a color stain on the treated tape. Based on the determined color and darkness of the color stain, the processor also determines a type and concentration of gas to which the treated tape is exposed.

Systems and methods for wavelength spectrum analysis for detection of various gases using a treated tape

Systems and methods for detecting gas using a wide band light source, and at least two narrow band light sensors, wherein each sensor may be operable to detect light at a different range of wavelengths. Additionally, the gas detector device may comprise a color changing indicator operable to react with gas in the air to change color, wherein different gases may react to create different colors, and wherein the sensors detect light reflected by the color changing indicator from the wide band light source. The gas detector device may comprise a processor in communication with the at least two light sensors operable to receive detected reflected wavelength information from the light sensors, and determine the type of gas that reacted with the color changing indicator based on the color detected by the sensors, wherein each color may be associated with a different type of gas.

A gas detection apparatus includes a housing which carries a plurality of light emitting diodes which are coupled in parallel and which emit substantially the same wavelength of radiant energy. A closed loop control circuit maintains the radiant energy output of the diodes at substantially a predetermined value. The radiant light radiant light and a sample of a gas of interest are directed to a sensing position at which a gas responsive tape is positioned. Reflected light from the tape is detected at a sensor displaced from the tape. A light collecting element can be positioned between the coupled diodes and the sensing position.

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Bartlett, IL, United States of America

Peng Jin