Abrégé

The present invention relates to a photoacoustic gas detector including a gas measuring volume and a gas reference volume where the volumes are separated by at least one flexible membrane being responsive to pressure differences between the volumes. The detector also comprises a light source emitting light in a predetermined wavelength range into the measuring volume, the wavelength range being chosen based on the absorption spectrum of a gas to be measured. The gas detector also includes a measuring unit for measuring membrane movements. The measuring and reference volumes both define known mass centers, the position of the mass centers being chosen so as to balance the pressure on the membrane when subject to a movement in at least one predetermined first direction.

Classes IPC  ?

• G01N 21/3504 - CouleurPropriétés spectrales, c.-à-d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes en recherchant l'effet relatif du matériau pour les longueurs d'ondes caractéristiques d'éléments ou de molécules spécifiques, p. ex. spectrométrie d'absorption atomique en utilisant la lumière infrarouge pour l'analyse des gaz, p. ex. analyse de mélanges de gaz
• G01N 21/17 - Systèmes dans lesquels la lumière incidente est modifiée suivant les propriétés du matériau examiné
• G01N 21/39 - CouleurPropriétés spectrales, c.-à-d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes en recherchant l'effet relatif du matériau pour les longueurs d'ondes caractéristiques d'éléments ou de molécules spécifiques, p. ex. spectrométrie d'absorption atomique en utilisant des lasers à longueur d'onde réglable
• G01N 27/407 - Cellules et sondes avec des électrolytes solides pour la recherche ou l'analyse de gaz
• G01N 33/00 - Recherche ou analyse des matériaux par des méthodes spécifiques non couvertes par les groupes

Abrégé

The present invention relates to a photoacoustic gas detector including a gas measuring volume and a gas reference volume where the volumes are separated by at least one flexible membrane being responsive to pressure differences between the volumes. The detector also comprises a light source emitting light in a predetermined wavelength range into the measuring volume, the wavelength range being chosen based on the absorption spectrum of a gas to be measured. The gas detector also includes a measuring unit for measuring membrane movements. The measuring and reference volumes both define known mass centers, the position of the mass centers being chosen so as to balance the pressure on the membrane when subject to a movement in at least one predetermined first direction.

Classes IPC  ?

• G01N 21/17 - Systèmes dans lesquels la lumière incidente est modifiée suivant les propriétés du matériau examiné
• G01N 21/37 - CouleurPropriétés spectrales, c.-à-d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes en recherchant l'effet relatif du matériau pour les longueurs d'ondes caractéristiques d'éléments ou de molécules spécifiques, p. ex. spectrométrie d'absorption atomique en utilisant la lumière infrarouge en utilisant la détection pneumatique
• G01N 29/24 - Sondes

Classes IPC  ?

• G01N 21/17 - Systèmes dans lesquels la lumière incidente est modifiée suivant les propriétés du matériau examiné
• G01N 21/37 - CouleurPropriétés spectrales, c.-à-d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes en recherchant l'effet relatif du matériau pour les longueurs d'ondes caractéristiques d'éléments ou de molécules spécifiques, p. ex. spectrométrie d'absorption atomique en utilisant la lumière infrarouge en utilisant la détection pneumatique
• G01N 29/24 - Sondes

Produits et services

Sensors, detectors and monitoring instruments; analyzers, namely, gas analyzers; gas analyzers based on a combination of micro- and nanotechnology and infrared spectroscopy. Maintenance, installation and repair of sensors, detectors and monitoring instruments, and analyzers, namely, gas analyzers and gas analyzers based on a combination of micro- and nanotechnology and infrared spectroscopy.

Produits et services

(1) Sensors, detectors and monitoring instruments, namely, infrared sensors, radon detectors, battery performance monitors; Analyzers, namely, analyzers for infrared specter gases; gas analyzers based on a combination of micro- and nanotechnology and infrared spectroscopy namely infrared specter gas analyzers (1) Maintenance, installation and repair of sensors, detectors and monitoring instruments, namely infrared sensors, radon detectors, battery performance monitors, and analyzers, namely, gas analyzers for laboratory use and gas analyzers based on a combination of micro- and nanotechnology and infrared spectroscopy for laboratory use;

Produits et services

Sensors, detectors and monitoring instruments, namely, infrared sensors, radon detectors, battery performance monitors; analyzers, namely, gas analyzers for laboratory use; gas analyzers based on a combination of micro- and nanotechnology and infrared spectroscopy for laboratory use Maintenance, installation and repair of sensors, detectors and monitoring instruments, namely infrared sensors, radon detectors, battery performance monitors, and analyzers, namely, gas analyzers for laboratory use and gas analyzers based on a combination of micro- and nanotechnology and infrared spectroscopy for laboratory use

Abrégé

This invention relates to retrievable measuring cell for optical measurements in gas, the cell being defined by a gas conducting pipe having an input end adapted to be connected to a gas flow input intruding gas into the cell and an output end adapted to be connected to a gas flow output. The pipe ends also being adapted to be coupled to optical components including an optical transmitter transmitting light into said cell and an optical receiver adapted to receive light having passed through said cell, the optical beam in said cell having a predetermined shape, the optical components including a light source, at least two minors and a light receiver being mounted in known positions on an external frame covered by the pipe ends. The cell has an elongated shape corresponding to the optical beam shape.

Classes IPC  ?

• G01J 3/26 - Production du spectreMonochromateurs en utilisant une réflexion multiple, p. ex. interféromètre de Fabry-Perot, filtre à interférences variables
• G01N 21/03 - Détails de structure des cuvettes
• G01N 21/05 - Cuvettes à circulation de fluides

Abrégé

This invention relates to retrievable measuring cell for optical measurements in gas, the cell being defined by a gas conducting pipe having an input end adapted to be connected to a gas flow input intruding gas into the cell and an output end adapted to be connected to a gas flow output. The pipe ends also being adapted to be coupled to optical components including an optical transmitter transmitting light into said cell and an optical receiver adapted to receive light having passed through said cell, the optical beam in said cell having a predetermined shape, the optical components including a light source, at least two mirrors and a light receiver being mounted in known positions on an external frame covered by the pipe ends. The cell has an elongated shape corresponding to the optical beam shape.

Classes IPC  ?

• G01N 21/05 - Cuvettes à circulation de fluides
• G01N 21/03 - Détails de structure des cuvettes
• G01N 21/85 - Analyse des fluides ou solides granulés en mouvement

Abrégé

The present invention relates to a Fabry-Perot interferometer including two plane mirror surfaces mounted in a frame and a system including the interferometer. The mirrors have a known distance between them, and at least one of the mirror surfaces is both partially reflective and partially reflective, where there are at least two actuator units, each including at least one actuator. The first actuator unit is adapted to adjust said distance between said mirrors and the second actuator unit is adapted to modulate said distance at a chosen frequency, both thus providing a variation over a range of mirror distances corresponding to a range of filtered wavelengths in said Fabry-Perot interferometer. At least one of said mirrors is related to the frame through a silicon membrane, at least one of said actuator units comprising a piezoelectric material on said membrane, thus constituting a bimorph or unimorph actuator unit.

Classes IPC  ?

• G01J 3/26 - Production du spectreMonochromateurs en utilisant une réflexion multiple, p. ex. interféromètre de Fabry-Perot, filtre à interférences variables
• G01N 21/45 - RéfringencePropriétés liées à la phase, p. ex. longueur du chemin optique en utilisant des méthodes interférométriquesRéfringencePropriétés liées à la phase, p. ex. longueur du chemin optique en utilisant les méthodes de Schlieren
• G02B 26/00 - Dispositifs ou dispositions optiques pour la commande de la lumière utilisant des éléments optiques mobiles ou déformables

Abrégé

The present invention relates to a Fabry-Perot interferometer including two plane mirror surfaces mounted in a frame and a system including the interferometer. The mirrors have a known distance between them, and at least one of the mirror surfaces is both partially reflective and partially reflective, where there are at least two actuator units, each including at least one actuator. The first actuator unit is adapted to adjust said distance between said mirrors and the second actuator unit is adapted to modulate said distance at a chosen frequency, both thus providing a variation over a range of mirror distances corresponding to a range of filtered wavelengths in said Fabry-Perot interferometer. At least one of said mirrors is related to the frame through a silicon membrane, at least one of said actuator units comprising a piezoelectric material on said membrane, thus constituting a bimorph or unimorph actuator unit.

Classes IPC  ?

• G01J 3/26 - Production du spectreMonochromateurs en utilisant une réflexion multiple, p. ex. interféromètre de Fabry-Perot, filtre à interférences variables
• G02B 26/00 - Dispositifs ou dispositions optiques pour la commande de la lumière utilisant des éléments optiques mobiles ou déformables

Abrégé

The present invention relates to a Fabry-Perot interferometer including two plane mirror surfaces mounted in a frame and a system including the interferometer. The mirrors have a known distance between them, and at least one of the mirror surfaces is both partially reflective and partially reflective, where there are at least two actuator units, each including at least one actuator. The first actuator unit is adapted to adjust said distance between said mirrors and the second actuator unit is adapted to modulate said distance at a chosen frequency, both thus providing a variation over a range of mirror distances corresponding to a range of filtered wavelengths in said Fabry-Perot interferometer. At least one of said mirrors is related to the frame through a silicon membrane, at least one of said actuator units comprising a piezoelectric material on said membrane, thus constituting a bimorph or unimorph actuator unit.

Classes IPC  ?

• G02B 26/00 - Dispositifs ou dispositions optiques pour la commande de la lumière utilisant des éléments optiques mobiles ou déformables
• G01J 3/26 - Production du spectreMonochromateurs en utilisant une réflexion multiple, p. ex. interféromètre de Fabry-Perot, filtre à interférences variables