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Class 356/437 - Gas


Subclass of Class 356 - Optics: measuring and testing
Definition: Subject matter wherein the fluent material is a gaseous
No. of patents: 582
Last issue date: 05/22/2012


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NumberTitleIssue Date
8184296Emissions monitoring apparatus, system, and method
Some embodiments of the invention generally relate to an apparatus configured to monitor emissions. The apparatus includes a sampling chamber, a gas analyzer, and a particulate matter analyzer. The sampling chamber is configured to receive a portion of an exhaust fl...
05/22/2012
8184297Gas mixture measurement system and methods therefor
A system including at least one laser device extending a beam through an in-situ non-restrictive flow path of the gas mixture; and a measurer coupled to each laser device for obtaining a plurality of dynamic measurements over time of at least one species in the gas ...
05/22/2012
8154727Hollow waveguide cavity ringdown spectroscopy
Laser light is confined in a hollow waveguide between two highly reflective mirrors. This waveguide cavity is used to conduct Cavity Ringdown Absorption Spectroscopy of loss mechanisms in the cavity including absorption or scattering by gases, liquid, solids, and/or...
04/10/2012
8154728Analytical equipment enclosure incorporating phase changing materials
Thermally controlled enclosures that can be used with gas analyzers are described. The enclosures incorporate one or more phase changing materials that buffer ambient and internal heat loads to reduce the power consumption demand of mechanical or electronic heating ...
04/10/2012
8149407Method and apparatus for trace gas detection using off-axis cavity and multiple line integrated spectroscopy
A sensor for NO2 with ultrahigh sensitivity of detection is created by combining off-axis integrated cavity output spectroscopy (OA-ICOS) (which can provide large path lengths of the order of several km in a small volume cell) with multiple line integrate...
04/03/2012
8144328Methods and apparatus for normalizing optical emission spectra
An arrangement for in-situ optical interrogation of plasma emission to quantitatively measure normalized optical emission spectra in a plasma chamber is provided. The arrangement includes a flash lamp and a set of quartz windows. The arrangement also includes a plur...
03/27/2012
8130379Gas analyzer
Gas analyzer systems and methods for determining gas flux in a short intake tube configuration without using any Webb-Pearman-Leuning density correction. Gas analyzer systems and methods for measuring concentrations of gasses and in particular dry mole fraction of c...
03/06/2012
8107081Micro-cavity gas and vapor sensors and detection methods
Micro-cavity gas or vapor sensors and gas or vapor detection methods. Optical energy is introduced into a resonant micro-cavity having a deformable coating such as a polymer. The coating swells or expands when it is exposed to or absorbs a gas or vapor, thereby chan...
01/31/2012
8102532Resonant optothermoacoustic detection of optical absorption
A device comprising an acoustic detector, one or more thermal sensing elements coupled to the acoustic detector, and a light source. A method comprising directing a beam of light at a wavelength at or near one or more thermal sensing elements, wherein the thermal se...
01/24/2012
8098378Energy-efficient operating method for a gas sensor
Energy-efficient operating method for a gas sensor. In a method for determining a gas concentration with the aid of a gas sensor having a radiation source, the radiation source is operated using a first electric power in a first op...
01/17/2012
8098377Electric gated integrator detection method and device thereof
A cavity ring down system is optimized to precisely measure trace gases or particles in an air sample by using time sampling detection and multiple-sample averaging resulting in a high signal-to-noise ratio. In one embodiment, a cavity ring down system is programmed...
01/17/2012
8094313Wavelength modulation spectroscopy method and system
A method and system for measuring the concentration of a gas component in a measuring gas a provided. The wavelength of a light source is modulated with a modulation signal at a modulation frequency, while the wavelength is swept over an interaction feature of a sam...
01/10/2012
8085404Gas analyzer and gas analyzing method
A gas analyzer capable of measuring a concentration of a gas component in gas at sensor units provided at a plurality of positions in real time by decreasing the number of signals input from the sensor units to an analyzer so as to reduce a data amount input to the ...
12/27/2011
8085403Photoacoustic sensor
Embodiments of the apparatus, systems, and methods relate to a photoacoustic sensor includes an excitation source, a modulator, a quantum dot filter, an interferometer, a gas chamber, and a microphone. The excitation source generates a monochromatic light. The modul...
12/27/2011
8077317Sensor head for a dry powder agent
A sensor head for a dry powder agent according to an exemplary aspect of the present disclosure includes a housing defined along an axis along which light is communicated, the housing defines a multiple of apertures transverse to the axis and in communication with a...
12/13/2011
8004684Sensor head for a dry powder agent
A sensor head for a dry powder agent according to an exemplary aspect of the present disclosure includes a housing defined along an axis along which light is communicated, the housing defines a multiple of apertures transverse to the axis, the multiple of apertures ...
08/23/2011
7990538Signal processing for optical computing system
The present subject matter relates to methods of high-speed analysis of product samples during production of the product. Light is directed to a portion of a product under analysis and reflected from or transmitted through the product toward optical detectors. Signa...
08/02/2011
7969576Optical sensing based on wavelength modulation spectroscopy
Techniques, apparatus and systems for using Wavelength Modulation Spectroscopy measurements to optically monitor gas media such as gases in gas combustion chambers. ...
06/28/2011
7965391Airborne tunable mid-IR laser gas-correlation sensor
A method and apparatus for measuring target gas concentrations in an atmosphere. The method and apparatus emit in the atmosphere a laser beam tuned to a molecular absorption line of a target gas, receive a reflected signal affected by gas absorption of the target ga...
06/21/2011
7957003Nitrogen analyzing apparatus
The present invention provides a nitrogen analyzing apparatus comprising: a nitrogen concentration measuring device configured to measure the concentration of an nitrogen impurities in a mixed gas including argon and oxygen as main...
06/07/2011
7948626Method for the automated measurement of gas pressure and concentration inside sealed containers
The device comprises a laser source which emits a beam of a predetermined wavelength towards an optically transparent closed container and detectors arranged to detect the laser beam which is attenuated by the gas absorption. The detectors provide the first data of ...
05/24/2011
7940395Method and apparatus for identifying the chemical composition of a gas
Embodiments of the present invention relate to the analysis of the components of one or more gases, for example a gas mixture sampled from a semiconductor manufacturing process such as plasma etching or plasma enhanced chemical vapor deposition (PECVD). Particular e...
05/10/2011
7907283Method and device for determining the total oxygen content and/or the total carbon content in ammonia
The invention relates to a process for determining the total oxygen content and the total carbon content in ammonia, in which ammonia is first split into nitrogen and hydrogen, then the oxygen still present in the ammonia is reacted essentially fully with hydrogen t...
03/15/2011
7884939Gas-measuring arrangement with an open optical measuring section
A gas-measuring arrangement (1) with an open optical measuring section (7) is formed by a measuring device (5) with an array of lenses (10, 12, 19, 24), a phase mask (22), an optical path mirror (16) positioned obliquely, an...
02/08/2011
7884938Multiple beam wide band CRDS cavity sensor and detector
A common multi-gas ring down detector incorporates a cavity that has a piezoelectric mirror and at least two displaced mirrors to define two different transit paths in the cavity. The two paths intersect at the piezoelectric mirror at different angles. Two different...
02/08/2011
7884937Airborne tunable mid-IR laser gas-correlation sensor
A method and apparatus for measuring target gas concentrations in an atmosphere. The method and apparatus emit in the atmosphere a laser beam tuned to a molecular absorption line of a target gas, receive a reflected signal affected by gas absorption of the target ga...
02/08/2011
7880886Gas sensor
A gas sensor for measuring at least one gas concentration, in particular for a vehicle climate control system, having a substrate, an IR radiation source fastened on the substrate, an IR detector fastened on the substrate, a measurement chamber for receiving a gas h...
02/01/2011
7880887Apparatus and method for measuring the concentration of gases in a sterilization chamber
Accurate measurements of the concentration of a sterilant in a sterilization chamber are provided through the use of a light source, a first detector that receives light from the light source that has not passed through the sterilization chamber and a detector that ...
02/01/2011
7876443Multipass optical device and process for gas and analyte determination
A torus multipass optical device and method are described that provide for trace level determination of gases and gas-phase analytes. The torus device includes an optical cavity defined by at least one ring mirror. The mirror delivers optical power in at least a rad...
01/25/2011
7864322Optical methods and systems for detecting a constituent in a gas containing oxygen in harsh environments
A method for detecting a gas phase constituent such as carbon monoxide, nitrogen dioxide, hydrogen, or hydrocarbons in a gas comprising oxygen such as air, includes providing a sensing material or film having a metal embedded in a catalytically active matrix such as...
01/04/2011
7852480Hydrogen gas detection device
In a hydrogen gas detection device, light emitted from a light source is irradiated onto a hydrogen sensor whose reflectance (optical reflectance) varies upon contact with hydrogen gas, and the light transmitted through the hydrogen sensor or reflected by a reflecti...
12/14/2010
7847945Making and using doppler shifted measurements in gas filter correlation radiometry
A method is provided for making and using measurements in gas filter correlation radiometry. A Gas Filter Correlation Radiometer (GFCR) instrument is moved in a region of space surrounding a heavenly body. An atmosphere of the heavenly body is viewed with the GFCR i...
12/07/2010
7835005Gas analyzer system
A gas analyzer system includes an optical source, an optical filter assembly, a controller, and an analyzer. The optical source generates an optical signal. The optical filter assembly includes different optical filters in which to filter the optical signal. During ...
11/16/2010
7835004Gas sensors and methods of controlling light sources therefor
A gas sensor includes a light source, a power source in operative connection with the light source and a control system in operative connection with the light source and the power supply. The control system is adapted to control power input from the power source to ...
11/16/2010
7796265Optical absorption gas analyser
An optical absorption gas analyzer for determining the concentration of a target gas in a sample is disclosed. The analyzer comprises a chamber for containing the sample in use; a radiation source assembly arranged to emit radiation into the chamber; a first radiati...
09/14/2010
7787123Two line gas spectroscopy calibration
A method of calibrating an absorption spectroscopy measurement wherein the calibration method includes projecting laser light through a sample of a first quantity of a gas of interest and a second irrelevant quantity of a spectroscopically identical or similar gas (...
08/31/2010
7782462Sono-photonic gas sensor
Sensing a gas includes introducing a gas into a chamber, forming a standing acoustic wave in the chamber, and irradiating the chamber with electromagnetic radiation. Some of the electromagnetic radiation passes into the chamber, through the standing acoustic wave in...
08/24/2010
7777886Optical system including a weak lens and a beam translation plate for selectively coupling to the lowest order mode of an optical resonator
Improved optical alignment precision to a passive optical cavity is provided by including a combination of a weak focusing element and a translation plate in the input coupling optics. Adjustment of positions and angles of these optical elements, preferably after al...
08/17/2010
7768647Multi-color cavity ringdown based detection method and apparatus
A multi-color cavity ringdown based spectrometer is housed in a light tight enclosure to detect the presence of trace quantities of gas phase molecules emanating from explosives, drugs, or hazardous materials being transported through the enclosure or compounds cont...
08/03/2010
7764379Semiconductor laser natural gas analysis system and method
A system of gas property monitoring comprises a gas cell for containing a gas of interest and a semiconductor tunable laser spectroscopy system for generating a tunable signal that is transmitted through the gas of interest in the gas cell and detecting the tunable ...
07/27/2010
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