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| Number | Title | Issue Date |
| 8109128 | Cavity-enhanced photo acoustic trace gas detector with improved feedback loop A photo acoustic trace gas detector (100) is provided for detecting a concentration of a trace gas in a gas mixture. The detector (100) comprises a light source (101) for producing a light beam and a light modulator (103) for modulating t... | 02/07/2012 |
| 8096165 | Spectrophone assembly for identifying and detecting multiple species A spectrophone assembly comprises a single detector chamber, a plurality of lasers, a gas inlet for supplying a gas sample to the single detector chamber, and at least one microphone. The detector chamber has an internal geometry arranged to be simultaneously acoust... | 01/17/2012 |
| 7958771 | Photoacoustic sensor Various embodiments of the application provide a photoacoustic sensor, which includes: a gas cell having an opening; a light source to generate a radiation to radiate sample gas within the gas cell; a detector to detect the sample gas within the gas cell, and to gen... | 06/14/2011 |
| 7930925 | Method of measuring hydrogen concentration in member and device of measuring hydrogen concentration An art of hydrogen concentration measurement in which the hydrogen concentration of any given location of an object to be measured can be nondestructively obtained is provided. The steps comprises: placing an electromagnetic ultrasonic sensor 2 in the ... | 04/26/2011 |
| 7921693 | Photo-acoustic spectrometer apparatus A photo acoustic detection cell (6) is located within the optical cavity (3) of a cavity enhanced absorption spectroscopy apparatus (3,4,5). When a sample in the cell (6) absorbs radiation from a pulsed radiation beam coupled into the cav... | 04/12/2011 |
| 7895880 | Photoacoustic cell incorporating a quantum dot substrate Embodiments of the apparatus, systems, and methods relate to a photoacoustic cell including an excitation source, a chamber, and a quantum dot substrate between the excitation source and the chamber. The excitation source generates a light spectrum. The quantum dot ... | 03/01/2011 |
| 7886576 | Photoacoustic gas sensor A photoacoustic sensor includes a sensor system for photoacoustic detection, at least one noise canceling pressure sensor and a control system in operative connection with the noise canceling pressure sensor to actively cancel the effects of noise in the environment... | 02/15/2011 |
| 7861574 | Photoacoustic spectroscopy system and technique for remote sensing of explosives and toxic chemicals A user-friendly photoacoustic spectroscopy (PAS) system and process (technique) provides an open-field PAS instrument, unit and device to remotely sense explosives, chemicals and biological agents. The PAS system and process can include: a pulsed tunable laser, such... | 01/04/2011 |
| 7805980 | Selectivity enhancement in photoacoustic gas analysis via phase-sensitive detection at high modulation frequency A method for detecting a target fluid in a fluid sample comprising a first fluid and the target fluid using photoacoustic spectroscopy (PAS), comprises a) providing a light source configured to introduce an optical signal having at least one wavelength into the flui... | 10/05/2010 |
| 7797983 | Method and system for detecting one or more gases or gas mixtures and/or for measuring the concentration of one or more gases or gas mixtures The invention relates to a system and method for detecting one or more gases or gas mixtures and/or for measuring the concentration of one or more gases or gas mixtures, said system comprising at least a light source, a sample space, a reference chamber, and a measu... | 09/21/2010 |
| 7647815 | Method of identifying and detecting the concentrations of multiple species by means of a spectrophone A method of identifying and determining the concentrations of multiple species in a gas sample, includes providing a spectrophone assembly having a detector chamber, supplying the gas sample to the detector chamber and simultaneously passing a plurality of radiation... | 01/19/2010 |
| 7644606 | Photoacoustic spectroscopy system and technique for remote sensing of explosives and toxic chemicals A user-friendly photoacoustic spectroscopy (PAS) system and process (technique) provides an open-field PAS instrument, unit and device to remotely sense explosives, chemicals and biological agents. The PAS system and process can include: a pulsed tunable laser, such... | 01/12/2010 |
| 7398672 | System and method for gas analysis using photoacoustic spectroscopy A method for analyzing a target analyte gas concentration using a photoacoustic spectroscopy cell comprising: i) a modulatable light source which provides optical radiation at an absorption wavelength of a target analyte; ii) a resonant aco... | 07/15/2008 |
| 7365352 | Gas concentration flux measuring device A gas flux measuring device measures a region, such as a forest, as a measuring object with no influence by concomitants and with high responsiveness and excellent measuring stability. The device includes a laser beam source, laser output controller, wavelength modu... | 04/29/2008 |
| 7360397 | Detector with condenser An ambient condition detector has a housing that carries a sensor of an airborne constituent such as a gas, and a condenser for minimizing an inflow of moisture into the sensor. A filter can be used to reduce fluid flow velocity prior to passing through or by the co... | 04/22/2008 |
| 7358621 | Using sound waves and photic energy for electric power An electric power generating and gaining device using sound waves and photic energy to generate magnetism together using a crystal microphone device providing a metallic film with metallic coil leading wires to sense and receive the frequency of external sound waves... | 04/15/2008 |
| 7352465 | Sample conditioning and environmental control techniques for gas sensor The present invention is a system and method of conditioning the sample and surrounding environment of an exhaled breath sensor. It includes (i) using a particular molecular sieve for a triple purpose: (a) maintaining the sensor at a constant relative humidity durin... | 04/01/2008 |
| 7345766 | Measuring chamber for photo-acoustical sensors A measuring chamber for photo-acoustical sensors for the continuous measurement of radiation-absorbing substances, in particular of radiation-absorbing particles, in gaseous samples includes at least one entry and at least one exit for the samples, a tube section wi... | 03/18/2008 |
| 7316151 | Apparatus and method for accurate, real-time measurement of pipeline gas An apparatus for BTU measurement of natural gas having at least one reference spherical acoustic resonator containing a reference gas, a sample gas spherical acoustic resonator containing a natural gas sample, a first acoustic transmitter adapted to transmit a first... | 01/08/2008 |
| 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 |
| 7292787 | Selected-wavelength tuning filter and optical add/drop multiplexer The present invention relates to the selected-wavelength tuning apparatus which is provided with an AOTF, a radio-frequency signal generator, an optical detector, and a controller for detecting lights emitted from the AOTF with the optical detector and for controlli... | 11/06/2007 |
| 7272234 | Multi-channel active control system and method for the reduction of tonal noise from an axial fan A multi-channel active noise control system and method of reducing tonal noise emanating from a tonal noise source are disclosed. The system may include an adaptive controller, a plurality of loudspeakers driven by the loudspeaker, one or more microphones for genera... | 09/18/2007 |
| 7263871 | System and method for gas analysis using doubly resonant photoacoustic spectroscopy A method for analyzing gas concentration using doubly resonant photoacoustic spectroscopy, and a doubly resonant photaoacoustic gas detector comprising: i) a continuous wave light beam whose wavelength coincides with an absorption ... | 09/04/2007 |
| 7250602 | Probe device A probe device comprises a cantilever comprising a probe allocated to be opposed to a surface of a sample, means for feeding back a vibration amplitude value of the cantilever, thereby self-exciting and vibrating the cantilever at a predetermined frequency, means fo... | 07/31/2007 |
| 7245380 | Quartz-enhanced photoacoustic spectroscopy Methods and apparatus for detecting photoacoustic signals in fluid media are described. The present invention differs from conventional photoacoustic spectroscopy in that rather than accumulating the absorbed energy in the fluid of a sample cell, the absorbed energy... | 07/17/2007 |
| 7243548 | Surface wave chemical detector using optical radiation A surface wave chemical detector comprising at least one surface wave substrate, each of said substrates having a surface wave and at least one measurable surface wave parameter; means for exposing said surface wave substrate to an unknown sample of at least one che... | 07/17/2007 |
| 7242479 | Gas sensors The present invention relates to a device for accomplishing noise reduction in a photoacoustic gas detector using a sound damping element and/or a background or reference microphone where a preferably larger external volume that acts as a sound damping element (SDE)... | 07/10/2007 |
| 7238238 | Gasification monitor, method for detecting mist, film forming method and film forming apparatus A deposition apparatus supplies a reactive gas obtained by vaporizing a liquid material at a vaporizer 30 into a chamber 10 via a processing-gas pipe 40 and forms a thin film on a semiconductor wafer W due to a thermal decomposition of the react... | 07/03/2007 |
| 7191639 | On-chip magnetic force actuation of microcantilevers by coplanar coils An on-chip coil is provided in a micromachined device for magnetic actuation of a nanoelectromechanical microcantilever. The novel geometry involves a three dimensional solenoid or planar coil carrying high current that generates a large enough magnetic field in its... | 03/20/2007 |
| 7192782 | Method and apparatus for determining marker gas concentration in exhaled breath using an internal calibrating gas A method and an apparatus for measuring the concentration of a specific gas component of a gas mixture including another gas whose concentration is independently known using light absorption spectroscopy are provided. A method and an apparatus for assessing human ai... | 03/20/2007 |
| 7177018 | Multiplex illuminator and device reader for microcantilever array A device reader having a multiplex illuminator, the illuminator, and methods for reading deflection of a large number of microcantilevers are provided. The illuminator includes a micro-optical subassembly for illuminating cantilevers (illuminator) that uses a plural... | 02/13/2007 |
| 7170607 | Gas identification device An optical gas identification system including a measuring cell (20), a modulated light source (10), a microphone (22), and a signal amplifier (30). The light source (10) comprises a plurality of laser diodes (12) and can se... | 01/30/2007 |
| 7168292 | Apparatus for particulate matter analysis The apparatus described herein is a miniaturized system for particle exposure assessment (MSPEA) for the quantitative measurement and qualitative identification of particulate content in gases. The present invention utilizes a quartz crystal microbalance (QCM) or ot... | 01/30/2007 |
| 7161677 | Condensation sensor and method of controlling condensate film in sealed space with condensation sensor A condensation sensor detects whether hydrogen peroxide gas has condensed in a sealed space and determines the condition of a condensate film upon passage of time. The condensate film in the sealed space is controlled with the condensation sensor. The condensation s... | 01/09/2007 |
| 7106445 | Photoacoustic gas sensor utilizing diffusion The present invention relates to a photoacoustic gas sensor utilizing diffusion having a sensing volume and an acoustic pressure sensor volume containing an acoustic pressure sensor such that the fluid connection between the sensing volume and the acoustic pressure ... | 09/12/2006 |
| 7102809 | Acoustic-optic devices utilizing tellurium crystals Acoustic-optic devices which use a crystal of tellurium into which is launched acoustic shear waves by a lithium niobate transducer in accordance with an input RF signal. Tellurium used in the devices exhibits a figure of merit in the range of around 5,000 to 10,000... | 09/05/2006 |
| 7091869 | Optoacoustic measuring arrangement and use thereof The measuring arrangement contains a measuring cell and a reference cell, respectively, and microphones assigned to these cells, to which microphones an electronic evaluation circuit is connected and in which a subtraction of the signals of the microphones takes pla... | 08/15/2006 |
| 7089781 | Detector with condenser An ambient condition detector has a housing that carries a sensor of an airborne constituent such as a gas, and a condenser for minimizing an inflow of moisture into the sensor. A filter can be used to reduce fluid flow velocity prior to passing through or by the co... | 08/15/2006 |
| 7086287 | Electrostatic condenser type pressure sensor, and method for manufacturing the pressure sensor The present invention provides a small-sized electrostatic condenser type pressure sensor having high assembly accuracy but no dispersion in a detection accuracy, and a method for manufacturing the pressure sensor. An annular spacer is mounted on the confronting fac... | 08/08/2006 |
| 7069769 | Ultraviolet photoacoustic ozone detection A photoacoustic ozone detector includes an acoustic chamber, an ultraviolet light source, and a detector to detect audio signals. The acoustic chamber has an inlet for receiving a gas mixture containing ozone and an outlet for removing the gas mixture from the chamb... | 07/04/2006 |
