Wavelength Modulation Spectroscopy Based Optical Sensing
- 详细技术说明
- Researchers from UC San Diego have patented new techniques, apparatus and systems for using wavelength modulation spectroscopy measurements to optically monitor gas media. One example of this technology offers a method for optically sensing a gas medium using a tunable laser to produce a wavelength-modulated laser beam, without prior knowledge of individual pressure broadening coefficients or gas composition. In another application, this invention permits for the combination the harmonic signal of the modulation frequency from the first of two laserswith a harmonic signal frequency of a second laser to concomitantly measure gas concentration along with total gas pressure.
- *Abstract
-
None
- *IP Issue Date
- Jul 28, 2011
- *Principal Investigation
-
Name: Marco Borchers
Department:
Name: Steven Buckley
Department:
Name: Mohammadreza Gharavi
Department:
- 附加资料
- Patent Number: US7969576B1
Application Number: US200854352A
Inventor: Buckley, Steven G. | Gharavi, Mohammadreza | Borchers, Marco
Priority Date: 23 Mar 2007
Priority Number: US7969576B1
Application Date: 24 Mar 2008
Publication Date: 28 Jun 2011
IPC Current: G01N002100
US Class: 356437
Assignee Applicant: The Regents of the University of California
Title: Optical sensing based on wavelength modulation spectroscopy
Usefulness: Optical sensing based on wavelength modulation spectroscopy
Summary: The method is useful for optically sensing a gas medium based on wavelength modulation spectroscopy, where the gas medium is a mixture of a gas fuel and air in a premixing gas chamber in a gas turbine or engine.
Novelty: Sensing gas medium based on wavelength modulation spectroscopy, by modulating laser wavelength of tunable laser at modulation frequency to produce wavelength-modulated laser beam, and directing laser beam that transmits through gas medium
- 主要类别
- 光学
- 细分类别
- 激光
- 申请号码
- 7969576
- 其他
-
Background
Absorption spectroscopy permits measurements of gas concentration using the well-known Beer-Lambert law, which relates the amount of light absorbed due to a transition corresponding to a particular energy at a wavelength of light to the product of the concentration, the optical path length, and the wavelength-dependent absorption coefficient of the absorbing species. The specific wavelength or wavelengths probed correspond to particular energies associated with quantum-mechanical transitions in the molecule being measured.
Applications
Highly sensitive (ppm level) and fast method for measuring gases (e.g. CH4, H2O, CO, CO2, NH3, small hydrocarbons) in process or streams.
Tech ID/UC Case
20585/2006-255-0
Related Cases
2006-255-0
- 国家/地区
- 美国
