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| Number | Title | Issue Date |
| 7351954 | Method and apparatus for detecting gas concentration with infrared absorption characteristics A method and an apparatus for detecting gas concentration with infrared absorption characteristics have the function of automatic calibration. The function of automatic calibration is accomplished in such a manner that a reference chamber filled with CO2 ... | 04/01/2008 |
| 7323687 | infrared gas analyzer and infrared gas analysis method There are provided an infrared gas analyzer of a simple configuration, capable of taking measurements with high precision when using an infrared light source excellent in thermal responsiveness, and capable of ON/OFF operations at high speed, and an infrared gas ana... | 01/29/2008 |
| 7255474 | Parallel infrared spectroscopy apparatus and method A library of material samples is provided in a condition suitable for imaging using infrared (IR) spectroscopy. The samples are provided to one or more detection cells, each of the cells including or containing a reflective surface. Preferably, for imaging, an energ... | 08/14/2007 |
| 7244939 | Gas sensor A gas sensor of the type that detects the presence of a specific gas by monitoring the absorption of optical radiation transmitted through a chamber containing a sample of gas under test comprises an optical source for emitting radiation therefrom and a detector sen... | 07/17/2007 |
| 7221505 | Panoramic field of view acquiring and displaying system A panoramic field of view acquiring system comprises three telescopes, which acquire three separate images, each typically covering a little over one third of the total required scene and a multiplexer, which is used to transmit the three images, one at a time, to a... | 05/22/2007 |
| 7213444 | Optoacoustic gas sensor An optoacoustic sensor for detecting one or more target gases includes a body featuring halves containing measurement cells. Each measurement cell is in communication with a light source and a microphone as well as the ambient atmosphere. Evaluation and control elec... | 05/08/2007 |
| 7180476 | Exterior aircraft vision system using a helmet-mounted display An improved multiple-sensor vision system for use on vehicles or aircraft. The system utilizes a plurality of fixed sensors, such as infrared sensors, that provide signals that are recorded on tape and/or stored in memory. A processor digitally samples the stored im... | 02/20/2007 |
| 7149677 | Geometric model comparator and method A geometric model comparator is provided, which includes processing circuitry, memory, and comparison circuitry. The processing circuitry is configured to generate a target model from a source model. The memory is configured to store the source model and the target ... | 12/12/2006 |
| 7012692 | Photothermal conversion spectroscopic analysis method, and photothermal conversion spectroscopic analysis apparatus for carrying out the method It is an object to provide a photothermal conversion spectroscopic analysis method that enables measurement to be carried out with high sensitivity, and a photothermal conversion spectroscopic analysis apparatus that carries out the method. The photothermal conversi... | 03/14/2006 |
| 6452182 | Photometer with non-dispersive infraded absorption spectroscopy (NDIR) for measuring several constituents A photometer for measuring gas components. The photometer has an infrared radiator with radiator modulation, a measuring cell with a measurement and comparison chamber, and a detector which absorbs optopneumatically onto the gas component X, that is fille... | 09/17/2002 |
| 6392234 | Infrared optical gas sensor An infrared optical gas sensor is improved with respect to the quality of the measured signal. The infrared radiation detectors (4, 6) used as the reference radiation and measuring radiation detectors include thin layers of a partially transparent materia... | 05/21/2002 |
| 6320192 | Detector for use in infrared analyzer, flow detector and manufacturing method thereof A detector 1 for use in infrared gas analyzers has two compartments 14 and 15 to be filled with gas G showing the same absorption characteristics as the gas to be measured and which are arranged in series with a load cell 2, and the gas compartments 14 an... | 11/20/2001 |
| 6275747 | Microcomputer and its access speed control method A microcomputer usable for a long period of time even when disposed in a high dose radiation-exposed environment, and its access speed control method are provided. According to the microcomputer and the method, the total dose of radiation that the microco... | 08/14/2001 |
| 6222190 | Photo acoustic infrared (IR) detector Photo acoustic infrared (IR) detector including a chamber for receiving a gas or gas mixture, a window for allowing pulsed or modulated IR radiation into the chamber, and a pressure sensor adapted to measure pressure changes in the chamber as a consequenc... | 04/24/2001 |
| 6166383 | Non-dispersive infrared gas analyzer A non-dispersive infrared gas analyzer for determining concentrations of carbon dioxide and/or carbon monoxide, hydrocarbons, and nitrogen oxides has two measuring cells 4, 6 consecutively traversed by a beam, with an optopneumatic detector 22 for carbon ... | 12/26/2000 |
| 6040579 | Thermoelectric sensor Thermoelectric sensor (12) formed by a membrane (14) including a plurality of thermoelectric elements (20) formed of a plurality of thermoelectric couples and forming a plurality of elementary cells. Each elementary cell is thermally insulated from adjace... | 03/21/2000 |
| 5894128 | Infrared type gas analyzer An infrared type gas analyzer is formed of a measuring cell for receiving a gas to be measured; an infrared light source for irradiating the gas in the measuring cell; a correlation filter disposed adjacent to the measuring cell; and a sensor for detectin... | 04/13/1999 |
| 5793043 | Method and apparatus for determining the alcohol concentration in a gas mixture An apparatus for determining the alcohol concentration in a gas mixture, which may contain a number of such interference components that have substantial absorption within the range of the alcohol absorption line to be presently determined, by means of a ... | 08/11/1998 |
| 5739538 | Pneumatic infrared gas detector A pneumatic infrared gas detector includes a pair of expansion chambers and a pair of pressure chambers, each of which is connected at one end thereof to the corresponding expansion chamber. Each of the pressure chambers is divided by a diaphragm into a f... | 04/14/1998 |
| 5559333 | Apparatus of non-dispersive infrared analyzer A non-dispersive infrared analyzer and method for analyzing a concentration in a gas utilizes an infrared light source and a cell configured to have a gas flow therethrough. The cell also has an infrared light passage through which a sample gas stream and... | 09/24/1996 |
| 5464980 | Flame sensors and methods of sensing flame A flame sensor comprises a cell (10) containing an infra-red absorptive fluid such as carbon dioxide gas. Heating caused by absorption of the infra-red radiation is detected by measuring a resulting temperature or pressure change.... | 11/07/1995 |
| 5459075 | Apparatus for measuring the total content of organic carbon and nitrogen in water An apparatus for measuring the total content of organic carbon (TOC) and nitrogen (TN) in water. The TOC value is correctly determined as the sum of the liquid, dissolved, and solid substances of a specimen of the water. The apparatus includes a NDIR gas ... | 10/17/1995 |
| 5387971 | Method and apparatus for measuring concentration of a solution using pathlength complementally modulated cells Method and apparatus for measuring concentration of a solution use pathlength complementarily modulated cells comprising a sample cell and a reference cell arranged in parallel to each other and separated by a displacable separator window which is displac... | 02/07/1995 |
| 5362967 | Pneumatic infrared ray detector for use in gas analyzer A pneumatic infrared ray detector for use in a gas analyzer provided with a gas-slowly leaking mechanism capable of not only controlling a quantity of gas leaked in high accuracy but also increasing a range capable of controlling said quantity of gas leak... | 11/08/1994 |
| 5357113 | Infrared gas mixture analyzer A pneumatic detector, non-dispersive infrared analyzer employing detector cell chambers in optical series. The invention having an auxiliary chamber communicating with the front chamber to increase the rear chamber's signal so as to balance the signals fr... | 10/18/1994 |
| 5340542 | Apparatus for the measurement of the total content of organic carbon and nitrogen in water The invention relates to a method for measuring of the total content of organic carbon and of nitrogen in water. The total organic carbon value is obtained correctly as the sum of the liquid, dissolved, and solid materials of a sample of the water. The de... | 08/23/1994 |
| 5321266 | Pneumatic two-layer detector for NDIR gas analyzers Two gas-filled chambers (K1, K2) arranged one behind the other in the beam path, with frontal areas (F) transparent to the beam, are interconnected by a first line (L12) which contains a first pressure or flow rate sensor (SF1). A buffer space (P) is conn... | 06/14/1994 |
| 5292666 | Method for the measurement of the total content of organic carbon and nitrogen in water A method for measuring of the total content of organic carbon and of nitrogen in water. The total organic carbon value is obtained correctly as the sum of the liquid, dissolved, and solid materials of a sample of the water. The device comprises a non-disp... | 03/08/1994 |
| 5124553 | Optical measurement method using stacked germanium and silicone detectors A process for spectroscopically measuring the content of a component in a liquid mixture involves passing a single optical beam through the mixture without the use of a reference beam and measuring the intensities of transmitted light in two different wav... | 06/23/1992 |
| 5077469 | Calibrating a nondispersive infrared gas analyzer Compensation and calibration method for a nondispersive infrared gas analyzer which includes an infrared source of radiation, a measuring path, a reference path, modulation devices, a detector for differential pressure measuring, comprises the following s... | 12/31/1991 |
| 5055688 | Multicomponent infrared gas analyzer Nondispersive infrared gas analyzer for the concurrent measurement in the concentration of several components contained in a gas sample, and including a source of and modulator for infrared radiation, a measuring and reference chamber are traversed by sai... | 10/08/1991 |
| 4937448 | Self-normalizing single-beam laser spectrometer Self-normalization of laser spectrometers is provided by I"/I laser modulation and detection. A single tunable diode laser is frequency modulated by a high S/N ratio triangle wave, mechanically chopped, passed through an isothermal in-line gas and referen... | 06/26/1990 |
| 4849637 | Method and apparatus for continuously measuring the concentration of a gas component A method and appparatus for continuously measuring the concentration of at least one component of a gas sample by means of a laser for the purpose of charging the gas sample with radiation at a frequency in the range of an absorption line of the component... | 07/18/1989 |
| 4742229 | Pneumatic detector for nondispersive infrared gas analyzers A pneumatic detector for nondispersive infrared gas analyzers comprises two gas-filled chambers disposable one behind the colinearly with a source of infrared radiation and connected to one another by a gas conductive line containing a microflow sensor wh... | 05/03/1988 |
| 4714832 | Photometer Photometer with at least one measuring beam traversing a space that contains measuring gas is improved by a solid state detector made of a foil which is specifically made of polyvinyl-idene-fluoride or polyvinyl-fluoride or polyvinyl-chloride, and having ... | 12/22/1987 |
| 4700073 | Photometer An infrared photometer having a measuring cuvette with entrance and exit windows and an output detector preferably made of polyvinylidenfluoride; a second infrared detector definitely made of polyvinylidenfluoride, being partially transmissive is disposed... | 10/13/1987 |
| 4692622 | Infrared analyzer An infrared analyzer where infrared radiation is passed through a measurement cell containing a material that includes a component that absorbs infrared radiation. The radiation exiting the measurement cell passes into a first detector, through an optical... | 09/08/1987 |
| 4514635 | Non-dispersive infrared analyzer A non-dispersive infrared analyzer for determining the concentration of two components of a sample fluid. A zero fluid and a sample fluid are alternately supplied to two cells. Two pneumatic detectors are respectively optically arranged in series with two... | 04/30/1985 |
| 4393304 | Gas analyzer of the fluid modulation type A gas analyzer of the fluid modulation type includes at least one cell, structure for alternately introducing a sample gas to be analyzed and a reference gas into the cell, a detector for analyzing a property of the sample gas, and an arrangement for alte... | 07/12/1983 |
| 4373137 | Radiation detection and receiving in nondispersive infrared gas analyzer The chopped infrared radiation leaving a measuring and sample gas chamber in an infrared gas analyzer is passed through and into two serially arranged detection chambers which are connected to a differential pressure chamber with capacitive pickup. The ch... | 02/08/1983 |
