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| Number | Title | Issue Date |
| 7460956 | Systems and methods for time corrected lightning detection A lightning detection system provides an estimated location of a lightning stroke. The system includes sensors, and an analyzer. Each sensor provides messages having sensor identification, an amplitude responsive to the lightning stroke, and a time of detecting the ... | 12/02/2008 |
| 7405827 | Gas content measuring apparatus and method This publication discloses an apparatus and method for measuring a gas content. The apparatus includes a light transmitter (1), by means of which coherent light can be sent to the measurement object (3), a receiver (2), by means of which light t... | 07/29/2008 |
| 7358862 | Radiosonde system, radiosonde system receiver and signal processing method in a radiosonde receiver This publication discloses a radiosonde system, a radiosonde system receiver and a signal processing method for use in a radiosonde system. The radiosonde system comprises at least one radiosonde (1) with means for acquisition of position and/or weather data ... | 04/15/2008 |
| 7286935 | Method and device for hydrometeor detection This publication discloses a method and apparatus for measuring hydrometeors. According to the method, the mechanical impulses of hydrometers falling on a detection surface are measured. According to the invention, part of the measuring device (1) is used to ... | 10/23/2007 |
| 7249502 | Precipitation/hail sensor and method for precipitation rate measurement The invention relates to a precipitation detector (1) and method for measurement of precipitation parameters. The detector (1) includes a frame (5), a surface (2) mounted on the frame (5) and adapted to receive hydrometeors, and de... | 07/31/2007 |
| 7218279 | Method and apparatus for pointing the beam of a wind profiler The present invention relates to a method and apparatus for pointing the beams (63–67) of a wind profiler comprising a stationary antenna matrix (61) with several individual antenna elements (62). According to the method an input signal is fed... | 05/15/2007 |
| 7187178 | Method for determining the voltage sensitivity of the distance between the mirrors of a fabry-perot interferometer A method for determining the voltage sensitivity of the distance between the mirrors of a Fabry-Perot interferometer in a measuring device, which is intended to measure a predefined gas (CO2), of which at least one absorption maximum or minimum is known. At least tw... | 03/06/2007 |
| 7036356 | Method and apparatus for defining water content of a liquid The invention relates to a method and apparatus for measurement of total water content in a liquid. According to the method, the relative water content (aw) of the liquid is measured in a first measurement step at a first temperature (T1). According to th... | 05/02/2006 |
| 6961662 | Systems and methods for spectral corrected lightning detection A lightning detection system provides an estimated location of a lightning stroke. The system includes sensors and an analyzer. Each sensor within range of a lightning event provides messages to the analyzer. Each sensor includes a waveform engine that converts a si... | 11/01/2005 |
| 6809528 | Method and apparatus for measuring water content A method and apparatus for measuring the water content of a liquid, including a method step for electrically measuring the property of the liquid for one parameter. The properties of the liquid are measured at least substantially simultaneously by another electrical... | 10/26/2004 |
| 6791311 | Lightning detection and data acquisition system A lightning detection and data acquisition system. A plurality of remote programmable sensor is utilized to detect cloud to ground and IC lightning strikes. Analog representations of the lightning strikes are converted to digital signals. The digital signals are cla... | 09/14/2004 |
| 6788043 | Lightning detection and data acquisition system A lightning detection and data acquisition system. A plurality of remote programmable sensor is utilized to detect cloud to ground and IC lightning strikes. Analog representations of the lightning strikes are converted to digital signals. The digital signals are cla... | 09/07/2004 |
| 6735525 | Systems and methods for spectral corrected lightning detection A lightning detection system provides an estimated location of a lightning stroke. The system includes sensors and an analyzer. Each sensor within range of a lightning event provides messages to the analyzer. Each sensor includes a waveform engine that converts a si... | 05/11/2004 |
| 6564633 | Measurement method and system for a humidity or gas concentration sensor A method and system relating to an improvement in measuring accuracy of a gas concentration sensor, the method comprising the steps of measuring a parameter of the sensor, the parameter being a resistance or a capacitance, that is sensitive to the gas or ... | 05/20/2003 |
| 6177673 | Optically black surface for producing the same The invention relates to a structure suitable for manufacturing by the fabrication techniques of micro-electronics so as to include an optically black surface that functions as an absorber or emitter, respectively, over a predetermined wavelength range, t... | 01/23/2001 |
| 5987963 | Method of improving the selectivity of a polymer-film gas sensor and a sensor structure for implementing the method The invention relates to a method for improving the selectivity of a polymer film gas sensor. According to the method, the gas sensor is heated and a sensor parameter sensitive to the variable under measurement is recorded. According to the invention, the... | 11/23/1999 |
| 5954430 | Method and temperature sensor structure for elimination of radiation error The invention relates to a method and temperature sensor structure for compensating radiation error particularly in a radiosonde, rocket sonde or dropsonde. According to the method, each sonde carries at least one temperature sensor. According to the inve... | 09/21/1999 |
| 5880836 | Apparatus and method for measuring visibility and present weather The invention relates to an apparatus and method for measuring visibility and present weather. The apparatus includes a light source (1) for directing a light ray toward the object (9) to be measured, a detector (3) for measurement of light which is forwa... | 03/09/1999 |
| 5850354 | Calibration method for NDIR equipment and calibration apparatus A method and apparatus for calibrating an NDIR gas analyzer is provided. According to the method, the apparatus under calibration is calibrated with the help of a reference apparatus under controlled conditions. The reference apparatus is a laboratory-cal... | 12/15/1998 |
| 5835216 | Method of controlling a short-etalon fabry-perot interferometer used in an NDIR mearsurement apparatus A method of controlling a short-etalon Fabry-Perot interferometer used in an NDIR measurement apparatus includes generating a measurement signal using a radiant source. The measurement signal is provided to a sample point containing a gas mixture to be me... | 11/10/1998 |
| 5827438 | Electrically modulatable thermal radiant source with specific filament The invention is related to an electrically modulatable thermal radiant source with a multilayer structure. The radiant source includes a substrate, a first insulating layer formed onto the substrate, a radiant surface layer formed onto the first insulati... | 10/27/1998 |
| 5821898 | Codeless GPS positioning method and apparatus for such codeless positioning The invention relates to a method and an apparatus for codeless GPS positioning. According to the method, the unit (2) to be positioned receives GPS signals from several satellites (4), the codes of the GPS signals are removed, and the extracted carrier s... | 10/13/1998 |
| 5818586 | Miniaturized fabry-perot spectrometer for optical analysis A miniaturized spectrometer for gas concentration measurement includes a radiation source for admitting electromagnetic radiation onto the gas to be measured, a detector for detecting the radiation transmitted through or emitted from the gas, an electrica... | 10/06/1998 |
| 5801647 | Method and apparatus for measuring road surface conditions The present invention relates to a method and apparatus for measuring road surface conditions. In the method of measuring road surface conditions, the conditions prevailing on the surface of a road are measured by a sensor head mounted in the pavement of ... | 09/01/1998 |
| 5750903 | Method of linearizing a flow velocity sensor, a linearized flow velocity measurement apparatus and system The invention relates to a method and apparatus for linearizing a flow velocity sensor based on pressure difference measurement. According to the method, a difference of two pressure signals is measured from the flow under measurement and is proportional ... | 05/12/1998 |
| 5656781 | Capacitive pressure transducer structure with a sealed vacuum chamber formed by two bonded silicon wafers A capacitive pressure transducer structure and a method for manufacturing the same comprises a transducer structure having a contiguous diaphragm structure (2), which at least in some parts is conducting to the end of forming a first electrode (4) of a tr... | 08/12/1997 |
| 5646729 | Single-channel gas concentration measurement method and apparatus using a short-resonator Fabry-Perot interferometer A single-channel gas concentration measurement method and apparatus. According to the method, a radiant source is employed to generate a measuring signal, the measuring signal is subsequently directed to a measurement object containing a gas mixture to be... | 07/08/1997 |
| 5644676 | Thermal radiant source with filament encapsulated in protective film An electrically modulatable radiant source includes an essentially planar substrate, a well or hole formed in the substrate, and at least one incandescent filament attached to the substrate. The incandescent filament is aligned with the well or hole and i... | 07/01/1997 |
| 5644080 | Method of measuring dewpoint or gas concentration and apparatus for prediction of icing The invention relates to an indirect measurement method of dewpoint or gas concentration and an apparatus suited for prediction of icing. The method is based on measuring the relative concentration of the gas directly and simultaneously measuring the temp... | 07/01/1997 |
| 5641911 | Method and apparatus for feedback-control of an asymmetric differential pressure transducer The invention is related to a feedback method and apparatus for a capacitive differential pressure transducer. According to the method, a pressure-transducing conducting diaphragm (1) forming a first, moving electrode of the transducer capacitances is kep... | 06/24/1997 |
| 5625139 | Method of measuring concentration of nonpolar gases such as carbon dioxide by means of a polymer-based sensor and concentration sensor structure The invention relates to a method and sensor structure for measuring the concentration of nonpolar gases such as carbon dioxide. According to the method, the concentration of the nonpolar gas adsorbed/absorbed in a polymer film (2) is determined by detect... | 04/29/1997 |
| 5589689 | Infrared detector with Fabry-Perot interferometer The invention relates to a silicon micromechanically fabricated infrared detector having an infrared radiation absorbing layer (7, 44) deposited on an insulating substrate and a detector (11, 24, 25) for detecting the amount of radiation absorbed in the m... | 12/31/1996 |
| 5561523 | Electrically tunable fabry-perot interferometer produced by surface micromechanical techniques for use in optical material analysis An electrostatically tunable Fabry-Perot interferometer produced by surface micromechanical techniques is used in optical material analysis as an optical sweeping filter in which the optical measurement wavelength is centered at a wavelength λ. The Fabry... | 10/01/1996 |
| 5531128 | Capacitive transducer feedback-controlled by means of electrostatic force and method for controlling the profile of the transducing element in the transducer The invention is related to a capacitive transducer feedback-controlled by means of electrostatic force and a method for controlling said transducer. The transducer comprises a body part (8) supporting a dynamically moving transducing element sensitive to... | 07/02/1996 |
| 5504577 | Method and apparatus for measuring meteorological visibility and scattering of light, said apparatus utilizing common optics for transmission and reception The invention concerns a method and device for measuring the meteorological visibility and the scattering of light. A light pulse is emitted into the atmosphere via an optical transmit system, the backscattered light returns via the optical transmit syste... | 04/02/1996 |
| 5500569 | Electrically modulatable thermal radiant source and method for manufacturing the same A radiant source including an essentially planar substrate having a well or hole formed therein. At least one incandescent filament is mounted to the substrate and aligned at the well or hole. Contact pads are formed onto the substrate, to both ends of th... | 03/19/1996 |
| 5434778 | Method and apparatus for measuring prevailing weather and meteorological visibility A method and apparatus measuring prevailing weather and meteorological visibility. According to the method an optical scattering-type measurement instrument is used for determining the apparent volume of precipitation in a measurement space. The apparent ... | 07/18/1995 |
| 5369278 | Calibration method for gas concentration measurements A calibration method for gas concentration measurement with an NDIR technique based on optical absorption. Radiation is imposed onto the gas mixture under measurement contained in a measurement channel (3) isolated at least partially from its environment,... | 11/29/1994 |
| 5160843 | Apparatus and method for measuring gas concentrations An apparatus and method measures the concentration of a gas. The apparatus comprises a radiation source (70) for emitting radiation onto the gas (79) to be measured, whereby the radiation source (70) is comprised of an anode (4) and a cathode (9), and as ... | 11/03/1992 |
| 5116124 | Measurement system for scattering of light This invention concerns an apparatus for the measurement of the parameters of atmospheric visibility or optical density. The apparatus includes a transmitter with which light operating as the measurement signal can be emitted to the measured space; a rece... | 05/26/1992 |
