Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1997-06-06
2000-05-16
Font, Frank G.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
356437, G01N 2100
Patent
active
060644885
ABSTRACT:
A method and apparatus for in situ measurement of the concentration of a gas with a frequency modulated tunable diode laser is disclosed. The sampling cell, which is mounted in the flow of gases to be measured, is a Herriott cell. Gas enters the sampling cell through sintered metal filters that prevent entrance of particulates. Signals from a sample detector and a null detector are compared to eliminate interference patterns from the laser optics. High accuracy dynamic calibration of the apparatus is also disclosed.
REFERENCES:
patent: 3743430 (1973-07-01), Riggs
patent: 4297035 (1981-10-01), Bjorklund
patent: 4523847 (1985-06-01), Bjorklund et al.
patent: 4549080 (1985-10-01), Baskins et al.
patent: 4560873 (1985-12-01), McGowan et al.
patent: 4594511 (1986-06-01), Cooper et al.
patent: 4684258 (1987-08-01), Webster
patent: 4726644 (1988-02-01), Mathis
patent: 4730112 (1988-03-01), Wong
patent: 4765736 (1988-08-01), Gallagher et al.
patent: 4849637 (1989-07-01), Cerff et al.
patent: 4883963 (1989-11-01), Kemeny et al.
patent: 4934816 (1990-06-01), Silver et al.
patent: 4937448 (1990-06-01), Mantz et al.
patent: 4941747 (1990-07-01), Dakin
patent: 5020909 (1991-06-01), Landa
patent: 5026991 (1991-06-01), Goldstein et al.
patent: 5047639 (1991-09-01), Wong
patent: 5066126 (1991-11-01), Hatori
patent: 5093743 (1992-03-01), Eng et al.
patent: 5111519 (1992-05-01), Mathis
patent: 5125051 (1992-06-01), Goutzoulis et al.
patent: 5125747 (1992-06-01), Sayegh et al.
patent: 5136671 (1992-08-01), Dragone
patent: 5173749 (1992-12-01), Tell et al.
patent: 5173794 (1992-12-01), Cheung et al.
patent: 5224183 (1993-06-01), Dugan
patent: 5239185 (1993-08-01), Ito et al.
patent: 5267019 (1993-11-01), Whittaker et al.
patent: 5317156 (1994-05-01), Cooper et al.
patent: 5317379 (1994-05-01), Ryan et al.
patent: 5319435 (1994-06-01), Melle et al.
patent: 5347525 (1994-09-01), Faris
patent: 5436459 (1995-07-01), Koch et al.
patent: 5444528 (1995-08-01), Puschell
patent: 5469265 (1995-11-01), Measures et al.
patent: 5473719 (1995-12-01), Stone
patent: 5491341 (1996-02-01), McCaul et al.
patent: 5499313 (1996-03-01), Kleinerman
patent: 5526155 (1996-06-01), Knox et al.
patent: 5528040 (1996-06-01), Lehmann
patent: 5625189 (1997-04-01), McCaul et al.
patent: 5818578 (1998-10-01), Inman et al.
Arndt, R., "Analytical Line Shapes for Lorentzian Signals Broadened by Modulation," Journal of Applied Physics, V. 35, No. 8, Aug. 1965, pp. 2522-2524.
Reid, J. et al., "High sensitivity pollution detection employing tunable diode lasers," Applied Optics, V. 17, No. 2, Jan. 15, 1978, pp. 300-307.
Reid, J. et al., "Second-Harmonic Detection with Tunable Diode Lasers--Comparison of Experiment and Theory," Applied Physics, Spring, 1981, B 26, pp. 203-210.
Bonse, D.S. et al., "Frequency modulation and wavelength modulation spectroscopies: comparison of experimental methods using a lead-salt diode laser," Applied Optics, V. 31, No. 6, Feb. 20, 1992, pp. 718-731.
Goldstein, N. et al., "Measurement of molecular concentrations and line parameters using line-locked second harmonic spectroscopy with AIGaAs diode laser," Applied Optics, V. 31, No. 18, Jun. 20, 1992, pp. 3409-3415.
Goldstein, N. et al., "Long-atmospheric-path measurements of near-visible absorption lines of O.sub.2 isotopes and H.sub.2 O with a prototype AIGaAs laser transceiver system," Applied Optics, V. 32, No. 30, Oct. 20, 1993, pp. 5849-5855.
Bien Fritz
Brand Joel A.
Fetzer Gregory J.
Goldstein Neil
Groff Kenneth W.
Font Frank G.
Merlino Amanda
Monitor Labs, Inc.
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