Method and system for correcting incident light fluctuations in absorption spectroscopy
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United States of America Patent
Stats
-
Jan 17, 2017
Grant Date -
Sep 24, 2015
app pub date -
Mar 19, 2015
filing date -
Mar 24, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method and system for correcting the effect of intensity fluctuations of the transmitted light in an absorption spectroscopy system used for the detection or measurement of chemical species in a medium, whereby one or more modulation bursts are imposed onto a light beam that passes through the medium. This burst signal may be obtained by modulating the bias current of a tunable diode laser, and the modulation burst signal may be optimally at the second harmonic of the modulation frequency of a wavelength modulated beam to allow usage of the same signal path processing used for the spectroscopic detection of the measurand for a second harmonic detection system. The burst signal can be controlled using a smooth window function to minimise the effects of non-linear perturbations that are inherent in tunable diode laser wavelength modulation spectroscopy systems, of optical interference fringes (etalons) and of the residual light absorption by background chemical species or the measurand at the wavelength coinciding with the modulation burst.
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International Classification(s)
- 2015 Application Filing Year
- G01J Class
- 1516 Applications Filed
- 1256 Patents Issued To-Date
- 82.85 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 26 Citation Count
- G01J Class
- 95.52 % this patent is cited more than
- 8 Age
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| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jul 17, 2028 |
