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Device and method for detecting gases by absorption spectroscopy

A detection device, photodetector technology, applied in absorption/scintillation/reflection spectroscopy, spectrometry/spectrophotometry/monochromator, measurement device, etc., and can solve the problems of being difficult to carry, bulky, etc.

Inactive Publication Date: 2005-08-24
TDW DELAWARE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Obviously, if the beam is to be passed through a very long tube containing a gas sample, then a device requiring such a long tube would be very bulky and thus difficult to carry

Method used

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  • Device and method for detecting gases by absorption spectroscopy
  • Device and method for detecting gases by absorption spectroscopy
  • Device and method for detecting gases by absorption spectroscopy

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Embodiment Construction

[0052] See attached picture, first look at figure 1 , which shows a block diagram of the main components of a system that can be used to implement the method of the present invention. The heart of the system is a chamber 10, described in detail subsequently, which provides an environment in which a beam of light 12 is passed through a gas sample and in which the absorption of the beam is measured.

[0053] As will be described below, in this invention the light beam is provided by a laser diode, in this case the light beam 12 is a laser beam. However, the invention can also be practiced with a light source providing an incoherent light beam. One example of an incoherent light source is a light emitting diode (LED). Laser diodes provide a coherent beam of substantially the same optical frequency and are characterized by the fact that the laser beam does not disperse to the same extent as incoherent beams. There are advantages to using a laser, such as a laser diode to genera...

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Abstract

A method and device for measuring a concentration of a preselected gas in a gas sample are disclosed. The device comprises a Herripott type multipass cell having a center axle and a housing surrounding and spaced from the axle to provide a tubular sample cavity. The gas sample is pumped through the sample cavity via apertures provided in opposed ends of the axle. A first mirror and a second mirror are supported at opposed ends of the axle. A light source, e.g. a laser or LED, is provided for emitting a light beam into the sample cavity via en entry aperture in the first mirror, the light beam having a wave length at which the preselected gas strongly absorbs. The beam is reflected between the mirrors for a number of times before exiting the cell via an exit aperture in the second mirror and impinging the intensity of the unattenuated light beam and a detector for detecting the intensity of light transmitted through the second mirror after a single pass through the cell. The light source is operatively connected to a heat control assembly having a heat sink and the gas sample is passed said heat sink to augment temperature control of the light source.

Description

[0001] Patent Application Reference [0002] This application is not related to co-pending patent applications in any country. [0003] Microfilm Reference [0004] This application is not referenced in any Microfiche Addendum. Background technique [0005] A common method of distributing energy around the world is through the transmission of gas, usually natural gas, but also artificial gas in some parts of the world for use in homes and factories. Often the gas is transported through underground lines that have branches to extend into homes and other buildings to provide energy for space heating and hot water. In virtually every major city in the world there are thousands of miles of gas pipelines. The gas is convenient to use because it is very flammable, so leakage of the gas requires special attention. For this reason, great efforts have been made to provide means for detecting trace amounts of gas so that the location of the leak can be determined for repair. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/42G01N21/03G01N21/05G01N21/35G01N21/39
CPCG01N21/031G01N2021/0307G01N2021/399G01N2021/052G01N21/39G01J3/42G01N2201/062G01N2201/0612G01J2003/423G01N21/3504
Inventor 法布里斯·马塞尔·S·布奈
Owner TDW DELAWARE INC
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