Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1998-02-11
1999-07-27
Hantis, K P
Optics: measuring and testing
For light transmission or absorption
Of fluent material
250343, 356409, G01N 2100
Patent
active
059300000
ABSTRACT:
An apparatus and method are disclosed for measuring the concentration of gases that are unstable or difficult contain in a sample cell. A frequency modulated laser is tuned to the frequency of a first spectral feature of a gas of interest and a laser beam is projected through a reference cell containing, at a selected pressure, a selected second gas that has a second spectral feature near the first spectral feature of the gas of interest. The laser is line-locked to an outer zero crossing of a third harmonic of the detected laser beam coincident with the first spectral feature. The concentration of the gas of interest is calculated from a second harmonic of a portion of the laser beam projected through a transmission medium containing the gas.
REFERENCES:
patent: 3995960 (1976-12-01), Fletcher et al.
patent: 4234258 (1980-11-01), Margolis et al.
patent: 4509130 (1985-04-01), Menzies et al.
patent: 4535241 (1985-08-01), Eberhardt
patent: 4934816 (1990-06-01), Silver et al.
patent: 5015099 (1991-05-01), Nagai et al.
patent: 5026991 (1991-06-01), Goldstein et al.
patent: 5173749 (1992-12-01), Tell et al.
patent: 5252060 (1993-10-01), McKinnon et al.
patent: 5267019 (1993-11-01), Whittaker et al.
patent: 5317156 (1994-05-01), Cooper et al.
patent: 5331409 (1994-07-01), Thurtell et al.
patent: 5436459 (1995-07-01), Koch et al.
patent: 5459574 (1995-10-01), Lee et al.
patent: 5550636 (1996-08-01), Hagans et al.
Hantis K P
Monitor Labs, Inc.
LandOfFree
Line-locked diode laser for gas spectroscopy does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Line-locked diode laser for gas spectroscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Line-locked diode laser for gas spectroscopy will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-885429