Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1998-08-31
2000-09-19
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
250343, 356437, G01V 800
Patent
active
061216275
ABSTRACT:
A gas detector, comprising a laser transmitter, a laser receiver, a gas reference cell formed of a sealed encircling wall defining an interior volume, a liquid partially filling the gas reference cell, a reference gas dissolved in the liquid and forming a vapor within the interior volume, at least a portion of the sealed encircling wall being transparent to electromagnetic radiation emitted by the laser transmitter to permit electromagnetic radiation to enter the gas reference cell, traverse a path through the vapor and exit the gas reference cell; and the laser transmitter, laser receiver and gas reference cell being coupled together with light guiding elements to form light paths that pass from the laser transmitter to the laser receiver through the gas reference cell and from the laser transmitter to the laser receiver through a target zone. A method of detecting a target gas, the method comprising the steps directing laser light from a laser transmitter to a laser receiver through a target zone and through a gas reference cell containing a sample of the target gas, wherein the gas reference cell contains a liquid in which the target gas is partially dissolved; detecting light from the laser transmitter that has passed through the target zone and light from the laser transmitter that has passed through the gas reference cell; and analyzing the detected light for the presence of the target gas in the target zone.
REFERENCES:
patent: 3697185 (1972-10-01), Kassel et al.
patent: 4820045 (1989-04-01), Boisde et al.
patent: 4968887 (1990-11-01), Wong
patent: 5026991 (1991-06-01), Goldstein et al.
patent: 5047639 (1991-09-01), Wong
patent: 5173749 (1992-12-01), Tell et al.
patent: 5202570 (1993-04-01), Tanaka et al.
patent: 5301014 (1994-04-01), Koch
patent: 5317156 (1994-05-01), Cooper et al.
patent: 5331409 (1994-07-01), Thurtell et al.
patent: 5340987 (1994-08-01), Eckles et al.
patent: 5381010 (1995-01-01), Gordon
patent: 5468962 (1995-11-01), Ohishi et al.
patent: 5477321 (1995-12-01), Johnson
Atmospheric pressure monitoring of trace gasses using tunable diode lasers, D.T. Cassidy and J. Reid, Applied Optics, Apr. 1, 1982, vol. 21, No. 7, p. 1185-1190.
Remote detection of methane with a 1.66-.mu.m diode laser, Kiyoji Uehara and Hideo Tai, Appplied Optics, vol. 31, No. 6, Feb. 20, 1992, p. 809-814.
Measurements of cross-sensitivity to contaminant gases using a highly-selective optical-fibre-remoted methane sensor based on correlation spectroscopy, Henry O. Edwards and John P. Dakin, SPIE vol. 1587 Chemical, Biochemical, and Environmental Fiber Sensors III (1991), p. 250-257. (Month Unknown).
In Situ and Real-Time Measurement of Methane Concentration in Rice Paddy Field at Okayama University Using Tunable Diode Laser Absorption Spectrometry, Naoki Kagawa, Osami Wada, Xu Hai, Ryuji Koga, Hiroya Sano and Kazayuki Inubushi, Jpn. J. Appl. Phys. vol. 32 (1993) Pt. 1, No. 1A, p. 244-245. (Month Unknown).
Remote detection of gases by diode laser spectroscopy, A. Mohebati and T.A. King, Journal of Modern Optics, 1988, vol. 35, No. 3, 319-324. (Month Unknown).
Remote Sensing of Methane Gas by Differential Absorption Measurement Using a Wavelength Tunable DFBLD, Y. Shimose, T. Okamoto, A. Maruyama, M. Aizawa, and H. Nagai, IEEE Photonics Techndology Letters, vol. 3, No. 1, Jan., 1991, p. 86-87.
Adjoint Spectrum I: an Algorithm to Extract Target Spectra Under Spectral Interferences for Use in On-Line Spectrometry, Moncef Bouzidi, Naoki Kagawa, Osami Wada and Ryuji Koga, Jpn. J. Appl. Phys. vol. 31 (1992) Pt. 3, No. 12A, p. 4071-4080. (Month Unknown).
A Novel Optical Fibre Methane Sensor, J.P. Dakin, C.A. Wade, SPIE vol. 734 Fibre Optics '87: Fifth International Conference on Fibre Optics and Opto-Electronics (1987), p. 254-260. (Month Unknown).
Absorption measurement of .nu..sub.2 + 2.nu..sub.3 bank of CH.sub.4 at 1.33 .mu.m using an InGaAsP light emitting diode, Kinpui Chan, Hiromasa Ito, and Humio Inaba, Applied Optics, vol. 22, No. 23, Dec. 1, 1983, p. 3802-3804.
Frequency modulation and wavelength modulation spectroscopies: comparison of experimental methods using a lead-salt diode laser, David S. Bomse, Alan C. Stanton, and Joel A. Silver, Applied Optcs, vol. 31, No. 6, Feb. 20, 1992, p. 718-731.
Lambert Anthony R.
Le Que T.
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