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| Number | Title | Issue Date |
| 8115931 | Photoacoustic detector for measuring fine dust A photoacoustic detector for measuring a concentration of fine dust particles in gas. The detector includes at least one acoustic sensor for detecting an acoustic signal. Additionally, the detector includes a pulsed light source for providing excitation light having... | 02/14/2012 |
| 8049895 | Instrument for measuring particle parameters Values for one or more particle properties, such as an aerosol asymmetry parameter g, can be measured directly using a detector that measures scattered light. The detector can comprise two or more diffusers coupled to optical sensors responsive to scattered light th... | 11/01/2011 |
| 8040518 | Cavity enhanced trace gas detection gradiometer A method and device for measuring trace levels of particles in an air sample is described. A device operating in a gradiometer configuration with two cavities built from a monolithic structure and utilizing a single probe laser, provides common mode subtraction of a... | 10/18/2011 |
| 7948627 | Photoelectric smoke detector A photoelectric smoke detector may detect presence of smoke by utilizing a light emitting element and a light receiving element whose optical axes intersect with each other. The photoelectric smoke detector may include a casing for storing the light emitting element... | 05/24/2011 |
| 7936460 | Sensor unit in exhaust gas analyzer An exhaust gas analyzer of the present invention includes a sensor unit 11 installed in an exhaust path from an engine, applies laser light to exhaust gas emitted from the engine and receives laser light that has passed through the exhaust gas so as to measur... | 05/03/2011 |
| 7760359 | Beam detector distance measurement A projected beam smoke detector includes circuitry and control software to measure a distance a beam travels between the detector's transmitter and receiver. Either a time-based or a phase-based measurement methodology could be used. A sensitivity parameter of the d... | 07/20/2010 |
| 7742170 | Method and system for countering laser technology Described herein is a method and system for providing a countermeasure against laser detection systems using nanocomponent material that is tailored to cloak or obscure a target from detection by transmitted laser radiation. The nanodot material absorbs and/or down-... | 06/22/2010 |
| 7697140 | Photoelectric smoke detector A photoelectric smoke detector is provided which is suitable for being downsized without detection capability deterioration. The present invention relates to a photoelectric smoke detector for detecting presence of smoke by utilizing a light emitting element and a l... | 04/13/2010 |
| 7659986 | Smoke sensor and electronic equipment In a smoke sensor, a first light-receiving element which receives light from a light-emitting element and is disposed in a position where the quantity of received light changes according to a density of smoke and a second light-receiving element which monitors the q... | 02/09/2010 |
| 7656534 | System for automatic detection of forest fires through optic spectroscopy The present invention relates to a system for detection of forest fires, based on the chemical analysis of the atmosphere through optic spectroscopy. The smoke originated from a fire has a chemical composition different from that of a normal atmosphere. This chemica... | 02/02/2010 |
| 7538879 | Light profile microscopy apparatus and method An apparatus and method allowing an optimized illumination in a light profile microscope by excitation of a sample with an elliptically collimated beam. The beam, which is typically supplied by a laser is collimated with unequal beam waist radii (and Rayleigh ranges... | 05/26/2009 |
| 7495767 | Digital optical method (DOM™) and system for determining opacity Photography is employed to objectively quantify opacity of fluids such as smoke plumes and dust via a method termed the Digital Optical Method (DOM™). The DOM™ quantifies the ratio of radiance values by means of a camera response curve obtained using objective m... | 02/24/2009 |
| 7483139 | Smoke detector A smoke detector (1) has a spherical chamber (2) including a plurality of holes (15,17) for allowing smoke and other particles to enter the chamber. The majority of the internal surface (3) of the chamber (2) is covered with a high... | 01/27/2009 |
| 7414727 | Gas detection method and gas detection device A method for etalon suppression in a gas detection device by determining an etalon fringe period during a calibration step without gas in dependency of the DC drive current. A measuring signal which is a function of the gas absorption and substantially independent o... | 08/19/2008 |
| 7400398 | Remote emissions sensing system and method incorporating spectral matching by data interpolation A system and method for correcting for “wavelength drift” in an RES system. One advantage provided by the invention includes the ability to correct for offset amounts of “wavelength drift” that are not divisible by an integer number of pixels (e.g., fraction... | 07/15/2008 |
| 7354553 | Method and apparatus for detecting the presence of elemental mercury in a gas sample An improved elemental mercury analyzer utilizes a fluorescence assembly in combination with a fluorescence quenching reduction mechanism to detect the concentration of elemental mercury within an emission gas sample, via fluorescence of the mercury within the gas sa... | 04/08/2008 |
| 7339870 | Optical disk apparatus and data reproducing method When the data is reproduced by irradiating a laser beam onto the optical disk, an amount-of-irradiation-beam detection signal is produced according to the amount of the laser beam irradiated onto the optical disk, and the defect on the optical disk is detected on th... | 03/04/2008 |
| 7324204 | Method and apparatus for trace gas detection In spectroscopic devices the sections of an optical measuring path from a light source to a measuring volume containing a measuring gas and from there to a measuring detector are often sealed off from the ambient atmosphere and purged with a purge gas such as dry ni... | 01/29/2008 |
| 7319524 | Air purged optical densitometer An advanced gas purged optical densitometer that significantly decreases the likelihood of optical component contamination and unstable optical path reduction includes an optical emitter, an optical receiver, and an optical path purge device. The optical emitter emi... | 01/15/2008 |
| 7304742 | Flow-through aerosol photoacoustic systems and methods Embodiments of photoacoustic devices, systems, and methods are disclosed. One device embodiment, among others, comprises a flow-through configuration for a test sample gas and a modular set of two or more solid-state or gaseous based lasers. ... | 12/04/2007 |
| 7301641 | Fiber optic smoke detector A passive sensor housing has an air gap formed therein between a collimating lens and a lens focused mirror reflecting optical light signals transmitted through the lens into the air gap within which smoke is received through screened openings in the housing. The op... | 11/27/2007 |
| 7298486 | Aerosol mobility size spectrometer A device for measuring aerosol size distribution within a sample containing aerosol particles. The device generally includes a spectrometer housing defining an interior chamber and a camera for recording aerosol size streams exiting the chamber. The housing includes... | 11/20/2007 |
| 7274994 | Exhaust opacity measuring device A remote emissions sensing system and method for sensing exhaust emissions from motor vehicles is provided where the system determines the opacity of an exhaust plume. The system comprises a radiation source that emits radiation which is passed through the exhaust p... | 09/25/2007 |
| 7268882 | Gas sensor arrangement in an integrated construction A gas sensor arrangement comprises a first half-shell mateable with a second half-shell. The first half-shell has a detector receiving opening and radiation source receiving apertures. A gas measuring chamber is formed between the first half-shell and the second hal... | 09/11/2007 |
| 7265842 | Method for detecting a gaseous analyte present as a minor constituent in an admixture A gaseous target analyte present as a minor constituent in an admixture with at least one other gaseous species can be detected using a cavity enhanced optical spectrometer by a process comprising the steps of: i) identifying a plu... | 09/04/2007 |
| 7262856 | Microstructured optical device for remote chemical sensing A microstructure-based chemical sensor that can be interrogated by a remote observer. The device acts as an electromagnetic wave filter in the optical region of the spectrum, filtering one or more wavelength bands where the band spectral notch location shifts in res... | 08/28/2007 |
| 7251035 | Optical cell measurement apparatus An inventive optical cell measurement apparatus comprises a light source (S) which emits light having a predetermined wavelength range, a first mirror (M1) which reflects the light emitted from the light source (S), a long light path gas cell (1) to wh... | 07/31/2007 |
| 7217121 | Method and apparatus for improved process control in combustion applications This invention relates to a method and apparatus for improved process control in combustion applications, and particularly those relating to the steelmaking industry. An apparatus is provided for process control in a combustion application comprising a laser to tran... | 05/15/2007 |
| 7215428 | Absorption spectroscopy apparatus and method An absorption spectroscopy apparatus including a sample cell having a central axis, and a side wall coaxially positioned about the axis. The side wall defines a generally circular cross-section of the cell as taken along a plane extending perpendicular to the axis, ... | 05/08/2007 |
| 7209046 | Method for the detection and signaling of dew films in smoke detectors A method for the detection and signaling of smoke by means of an optical assembly in a detector casing, the optical assembly including at least one optical transmitter element and at least one optical receiver element, and which emits a reception signal which is rep... | 04/24/2007 |
| 7170608 | Simplified analytical apparatus for field deployable measurements of molecular absorbance and florescence The invention simplifies the apparatus for the analysis of organic and inorganic compounds in solutions and atmospheres, or particulates in atmospheres. The apparatus supports molecular fluorescence and absorption analyses of trace environmental contaminants. The de... | 01/30/2007 |
| 7161678 | Systems and methods for determining the existence of a visible plume from the chimney of a facility burning carbon-based fuels Excess oxygen in the combustion process of a facility that bums carbon-based fuels may cause a visible plume in the atmosphere at the stack of the facility. Traditional optical based opacity monitors may be unable to detect this plume or the plume may form at a loca... | 01/09/2007 |
| 7122820 | Method for determining visibility, amount of precipitation and type of precipitation The invention is directed to a method and a combined visibility measuring and precipitation measuring instrument for determining visibility, amount of precipitation and type of precipitation. ... | 10/17/2006 |
| 7112447 | Hand held gas analyzer A lightweight and portable analyzer is provided. At least one component of the analyzer is made from a lightweight material, such as ABS. A manifold can have a plate and gas passages ultrasonically welded together. By having at least one component made from a lightw... | 09/26/2006 |
| 7095337 | Road traffic weather-monitoring system and self-luminous road sign system A self-luminous road sign system comprises a plurality of sensor units 1 . . . 1 each of which is equipped at least with a visibility meter and an illuminance meter, or which may be equipped with an anemovane and a thermometer as well as the visibility meter ... | 08/22/2006 |
| 7091470 | Purge air flow passage structure A purge air flow passage structure has an air flow passage for ventilating the purge air, a separation space that is provided in the air flow passage and separates dust in the purge air therefrom, and a filter that is provided in the air flow passage, is positioned ... | 08/15/2006 |
| 7084963 | Method and device for the comprehensive characterization and monitoring of exhaust gases and the regulation of engines in particular internal combustion engines and components for the treatment of exhaust gas Device of modular construction which permits the simultaneous or not-simultaneous recording and characterization of solid and liquid particles and gaseous components of engine exhaust gases on various test supports, with only small or no modification of the test sup... | 08/01/2006 |
| 7057175 | Infrared absorption measurement method, infrared absorption measurement device, and method of manufacturing semiconductor device An infrared absorption measurement method includes: (a) measuring infrared absorption of a measurement target component in a state in which a sample gas including the measurement target component is decompressed; (b) calculating an absorption area in a peak region o... | 06/06/2006 |
| 7053783 | Pathogen detector system and method A pathogen detector has a sample area for containing environmental air, a light source on one side of the sample area for directing a collimated beam of light through the sample air so that part of the light beam will be scattered by any particles present in the air... | 05/30/2006 |
| 7034702 | Optical smoke detector and method of cleaning An optical smoke detector for detecting particulates in an air sample. The detector includes a detection chamber defining an enclosure for the air sample. At least one opening is in fluid communication with the detection chamber whereby the air sample can be introdu... | 04/25/2006 |
