Abstract

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.

IPC Classes  ?

• G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
• G01N 21/17 - Systems in which incident light is modified in accordance with the properties of the material investigated
• G01N 21/39 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
• G01N 27/407 - Cells and probes with solid electrolytes for investigating or analysing gases
• G01N 33/00 - Investigating or analysing materials by specific methods not covered by groups

Abstract

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.

IPC Classes  ?

• G01N 21/17 - Systems in which incident light is modified in accordance with the properties of the material investigated
• G01N 21/37 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using pneumatic detection
• G01N 29/24 - Probes

IPC Classes  ?

• G01N 21/17 - Systems in which incident light is modified in accordance with the properties of the material investigated
• G01N 21/37 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using pneumatic detection
• G01N 29/24 - Probes

Goods & 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.

Goods & 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;

Goods & 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

Abstract

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.

IPC Classes  ?

• G01J 3/26 - Generating the spectrumMonochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filter
• G01N 21/03 - Cuvette constructions
• G01N 21/05 - Flow-through cuvettes

Abstract

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.

IPC Classes  ?

• G01N 21/05 - Flow-through cuvettes
• G01N 21/03 - Cuvette constructions
• G01N 21/85 - Investigating moving fluids or granular solids

Abstract

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.

IPC Classes  ?

• G01J 3/26 - Generating the spectrumMonochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filter
• G01N 21/45 - RefractivityPhase-affecting properties, e.g. optical path length using interferometric methodsRefractivityPhase-affecting properties, e.g. optical path length using Schlieren methods
• G02B 26/00 - Optical devices or arrangements for the control of light using movable or deformable optical elements

Abstract

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.

IPC Classes  ?

• G01J 3/26 - Generating the spectrumMonochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filter
• G02B 26/00 - Optical devices or arrangements for the control of light using movable or deformable optical elements

Abstract

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.

IPC Classes  ?

• G02B 26/00 - Optical devices or arrangements for the control of light using movable or deformable optical elements
• G01J 3/26 - Generating the spectrumMonochromators using multiple reflection, e.g. Fabry-Perot interferometer, variable interference filter