Optics: measuring and testing – For light transmission or absorption – Of fluent material
Patent
1995-09-11
1998-05-05
Rosenberger, Richard A.
Optics: measuring and testing
For light transmission or absorption
Of fluent material
G01N 2161
Patent
active
057483256
ABSTRACT:
Light from a laser transmitter propagates along several optical light guides from a laser transmitter to a laser receiver. The optical light guides form a guided light path traversing each of several target zones where unwanted gas may be present. An optical switch permits selection of one of the paths and hence one of the target zones for the detection of gas. A preferred light guide uses optical fibers with optical switches, or a combination of a splitter and a switch. A lens system provides for the collection of light from a transmitting fiber optic and receiving fiber optic. The gas detector is provided with means to eliminate phase sensitivity of the detector.
REFERENCES:
patent: 3697185 (1972-10-01), Kassel et al.
patent: 4459024 (1984-07-01), Gergely
patent: 4489239 (1984-12-01), Grant et al.
patent: 4516858 (1985-05-01), Gelbwachs
patent: 4684258 (1987-08-01), Webster
patent: 4820045 (1989-04-01), Boisde et al.
patent: 4934816 (1990-06-01), Silver et al.
patent: 5026991 (1991-06-01), Goldstein
patent: 5202570 (1993-04-01), Tanaka et al.
patent: 5241177 (1993-08-01), Albrecht
patent: 5255073 (1993-10-01), Wallen et al.
patent: 5301014 (1994-04-01), Koch
patent: 5339155 (1994-08-01), Partridge et al.
Ultrasensitive dual-beam absorption and gain spectroscopy: applications for near-infrared and visible diode laser sensors, Mark G. Allen, Karen L. Carleton, Steven J. Davis, William J. Kessier, Charles E. Otis, Daniel A. Palombo, and David M. Sonnenfroh, Applied Optics, vol. 34, No. 18, 20 Jun. 1995, pp. 3240-3248.
Abstract of U.S. Patent No. 5,448,071, issued Sep. 5, 1995, McCaul, et al, 5 pages.
Abstract of U.S. Patent No. 5,267,019, issued Nov. 30, 1993, Whittaker, et al, 2 pages.
Abstract of U.S. Patent No. 5,173,749, issued Dec. 22, 1992, Tell, et al, 2 pages.
Abstract of U.S. Patent No. 5,047,639, issued Sep. 10, 1991, Wong, 2 pages.
Abstract of U.S. Patent No. 4,968,887, issued Nov. 6, 1990, Wong, 2 pages.
Abstract of U.S. Patent No. 5,477,321, issued Dec. 19, 1995, Johnson, 2 pages.
Abstract of U.S. Patent No. 5,442,438, issued Aug. 15, 1995, Batchelder, et al, 4 pages.
Abstract of U.S. Patent No. 5,412,467, issued May 2, 1995, Malczewski, et al, 2 pages.
U.S. Navy fiber optic sensor technology, Carl P. Jacobson, SPIE vol. 3000, 0277-7B6X/97/51, pp. 1-8.
Code division multiplexing of fiber optic sensors with LED sources, Henry K. Whitesel and John K. Overby, SPIE vol. 3000, 0277-7B6X/97/pp. 9-16.
Development of a Fiber Optic Sensor Network for Naval Applications, R. Tarazona, J. Marechal-Fabre, SPIE vol. 3000, 0277-7B6X/97/pp. 17-28.
SpectraScan Open Path Monitor, Bovar Western Research, product brochure, 2 pages, believed to be dated 1997, but describes technology believed to have been on sale in the United States prior to filing of the patent application.
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, pp. 4071-4080.
Effects of speckle on the range precision of a scanning lidar, Jon Y. Wang and P. Andrew Pruitt, 20 Feb. 1992/vol. 31, No. 6/Applied Optics, pp. 801-808.
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 Optics, vol. 31, No. 6, 20 Feb. 1992, pp. 718-731.
Frequency-modulation spectroscopy for trace species detection: theory and comparison among experimental methods, Joel A. Silver, Applied Optics, vol. 31, No. 6, 20 Feb. 1992, pp. 707-717.
Quantum noise-limited FM spectroscopy with a lead-salt diode laser, Clinton B. Carlisle, David E. Colper and Horst Preier, Applied Optics, vol. 28, No. 13, pp. 2567-2576.
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, pp. 86-87.
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, 1 Dec. 1983, pp. 3802-3804.
Remote detection of methane with a 1.66-.mu.m diode laser, Kiyoji Uehara and Hideo Tai, Applied Optics, vol. 31, No. 6, 20 Feb. 1992, pp. 809-814.
Signal recording and averaging in diode-laser spectroscopy, Kiyoji Uehara, Optics Letters, vol. 12, No. 2, Feb. 1987, pp. 81-83.
Near-infrared diode lasers monitor molecular species, David E. Cooper and Ramon U. Martinelli, Laser Focus World, Nov., 1992, 5 pages.
Diode Lasers Finding Trace Gases in the Lab and the Plant, David Bomse, Photonics Spectra, Jun., 1995, pp. 88-93.
Diode laser spectroscopy for gas monitoring of environmental pollution and for industrial process and emission control, Ase Margrete Ballangrud, A thesis submitted to the University of Oslo in partial fulfillment of the requirements for the degree Dr. Scient., Jun., 1993, 165 pages.
All-Optical-Fiber-Based Remote Sensing System for Near Infrared Absorption of Low-Level CH.sub.4 Gas, Kinpui Chan, Hiromasa Ito, Humio Inaba, Journal of Lightwave Technology, vol. LT.3, No. 12, Dec., 1987, pp. 1706-1711.
Fiber Optics for Atmospheric Mine Monitoring, T.H. Dubaniewicz, J.E. Chilton, and H. Dobroski, U.S. Bureau of Mines, Pittsburgh, PA, 1991 IEEE, pp. 1243-1249.
Applications of IR-Fibers in Remote Gas-Spectroscopy, D. Pruss, P. Dreyer and E. Koch, Dragerwerk AG, Federal Republic of Germany, SPIE vol. 799 New Materials for Optical Waveguides (1987), pp. 117-122.
Long-Distance Simultaneous Detection of Methane and Acetylene by Using Diode Lasers Coupled with Optical Fibers, Hideo Tai, Kazushige Yamamoto, Masahiko Uchida, Susumu Osawa, and Kiyoji Uehara, IEEE Photonics Technology Letters, vol. 4, No. 7, Jul., 1992, pp. 804-807.
10 km-Long Fibre-Optic Remote Sensing of CH.sub.4 Gas by Near Infrared Absorption, K. Chan, H. Ito, H. Inaba, T. Furuya, Applied Physics B 38, 11-15 (1985), pp. 11-15.
Evanescent Wave Methane Detection Using Optical Fibres, B. Culshaw, F. Muhammad, G. Stewart, S. Mururay, D. Pinchbeck, J. Norris, S. Cassidy, M. Wilkinson, D. Williams, I. Crisp, R. Van Ewyk and A. McGhee, Electronics Letters, 19th Nov. 1992, vol. 28, No. 24, pp. 2232-2234.
A novel optical fibre methane sensor, J.P. Dakin, C.A. Wade, D. Pinchbeck, J.S. Wykes, SPIE vol. 734 Fibre Optics '87: Fifth International Conference on Fibre Optics and Opto-Electronics (1987), pp. 254-260.
Remote Flammable Gas Sensing Using a Fluoride Fibre Evanescent Probe, V. Ruddy, B. MacCraith, S. McCabe, SPIE vol. 1267 Fiber Optic Sensors IV (1990), pp. 97-103.
Fiber Optics network for the adverse coal mining environment, Jacek K. Zientkiewicz, and Zbigniew Lach, SPIE vol. 1366 Fiber Optics Reliability: Benign and Adverse Environments IV (1990), pp. 45-56.
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), pp. 250-257.
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, pp. 244-245.
Real Time Measurement of Methane Concentration in the Atmosphere, Y. Yamasaki, S. Takeuchi, Y. Akimoto, CPEM '88 Digest, pp. 235-236.
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.
Fiber-Optic evanescent-wave methane-gas sensor using optical absorption for the 3.392-.mu.m line of a He-Ne laser, Hideo Tai and Hiroaki Tanaka, Toshihiko Yoshino, Jun. 1987, vol.12, No. 6, Optics Letters, pp. 437-439.
Fiber Optics for Mine Gas Monitoring, T.H. Dubaniewicz and J.E. Chilton, Chapter 8, Mine Health and Safet
Lambert Anthony R.
Rosenberger Richard A.
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