Measuring and testing – Gas analysis – By vibration
Patent
1998-04-17
2000-09-12
Noori, Max
Measuring and testing
Gas analysis
By vibration
73597, G01N 700
Patent
active
061160806
ABSTRACT:
Apparatus and methods for performing acoustical measurements are provided having some and preferably all of the following features: (1) the system is operated under near-field conditions; (2) the piezoelement or piezoelements used in the system are (a) mechanically and electrically damped and (b) efficiently electrically coupled to the signal processing components of the system; (3) each piezoelement used in the system includes an acoustical transformer for coupling the element to a gaseous test medium; (4) speed of sound is determined from the time difference between two detections of an acoustical pulse at a receiver; (5) cross-correlation techniques are employed to detect the acoustical pulse at the receiver; (6) fast Fourier transform techniques are used to implement the cross-correlation techniques; and (7) stray path signals through the body of the acoustic sensor are removed from detected signals prior to signal analysis. Techniques are also provided for performing acoustical measurements on gases whose thermodynamic properties have not been measures and on mixtures of compressible gases. Methods and apparatus for performing feedback control of a gas of interest in a mixture of that gas and a carrier gas are provided in which the controlled variable is the flow of the carrier gas.
REFERENCES:
patent: 4596133 (1986-06-01), Smalling et al.
patent: 4630482 (1986-12-01), Traina
patent: 4835708 (1989-05-01), Frans
patent: 4850220 (1989-07-01), Asano et al.
patent: 5060507 (1991-10-01), Urmson et al.
patent: 5159843 (1992-11-01), Shakkottai et al.
patent: 5313820 (1994-05-01), Aylsworth
patent: 5325703 (1994-07-01), Magori
patent: 5351522 (1994-10-01), Lura
patent: 5369979 (1994-12-01), Aylsworth et al.
patent: 5392635 (1995-02-01), Cadet et al.
patent: 5768937 (1998-06-01), Wajid et al.
Bhatia, Ultrasonic Absorption, 1967, Oxford University Press, reprinted by Dover Publications, Inc., New York, 1985.
Cadet et al. "Ultrasonic time-of-flight method for on-line quantitation of semiconductor gases", Ultrasonics Symposium, Proceedings, New York, Institute of Electrical and Electronic Engineers, 1991, 295-300.
Chung et al., "Applications of kinetic gas theories and multiparameter correlation for prediction of dilute gas viscosity and thermal conductivity," Industrial & Engineering Chemistry Fundamentals, 1984, 23:8-13.
Cramer, H., Mathematical Methods of Statistics, Princeton University Press, 1946.
Desilets et al., "The Design of Efficient Broad-Band Piezoelectric Transducers", IEEE Transactions on Sonics and Ultrasonics, vol. SU-25, No. 3, May 1978, 115-125.
Born, M., Atomic Physics, J. Dougall trans., Hafner Publishing Company, New York, 1946.
Elmore et al., Physics Waves, 1969, McGraw-Hill Book Company, reprinted by Dover Publications, Inc., NY, 1985.
Fisher, R. A., On an Absolute Criterion for Fitting Frequency Curves, Mess. of Math., 41,, pp. 155-160, 1912.
Folkestad et al. "Chirp Excitation of Ultrasonic Probes and Algorithm for Filtering Transit Times in High-Rangeability Gas Flow Metering", IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 40, No. 3, May 1993, 193-215.
Gooberman, Ultrasonics, Hart Publishing Company, Inc. NYC, 1969.
Hallewell et al. "A simplified formula for the analysis of binary gas containing a low concentration of a heavy vapor in a lighter carrier", Ultrasonics Symposium, Proccedings, New York, Institute of Electrical and Electrical Engineers, 1994, 1311-1316.
Hallewell et al., "A Sonar-Based Technique for the Ratiometric Determination of Binary Gas Mixtures", Nuclear Instruments and Methods in Physics Research, A264, 1988, North-Holland, Amsterdam, 219-234.
Hunter, Acoustics, Englewood Cliffs, N.J., Prentice-Hall, Inc., 1957.
Inoue et al. "Design of Ultrasonic Transducers with Multiple Acoustic Matching Layers for Medical Application", IEEE Transaction on Ultrasonics, Ferroelectrics and Frequency Control, vol. UFFC-34, No. 1, Jan. 1987, 8-16.
Joos et al., "An ultrasonic sensor for the analysis of binary gas mixtures", Sensors and Actuators, B. 15-16, 1993, 413-419.
Polturak et al. "Precision acoustic gas analyzer for binary mixtures", Rev. Sci. Instrum. 57 (11), American Institute of Physics, Nov. 1986, 2837-2841.
Potzick, "On the Accuracy of Low Flow Rate Calibrations at the National Bureau of Standards", ISA Transactions, vol. 25, No. 2, 1986, 19-23.
Rayleigh, The Theory of Sound, 1877 treatise, reprinted by Dover Publ., New York, 1945.
Reid et al. "The Properties of Gases and Liquids", Fourth Edition, MaGraw-Hill, Inc., New York, 1987, 413-414.
Sorensen et al., Real-valued algorithms for the FFT Proceedings: ICASSP 87, 1987 International Conference on Acoustics, Speech, and Signal Processing (Cat. No. 87CH2396-0), pp. 1831-1834, vol. 3, p. 2425 vol. 4.
Stagg, J.P., "Reagent Concentration Measurements in Metal Organic Vapour Phase Epitaxy (MOVPE) Using an Ultrasonic Cell", Chemtronics, vol. 3, Mar. 1988, Harlow, Essex, UK, 44-49.
Tipler, Foundations of Modern Physics, Worth Publishers, Inc., New York, 1969.
Van Trees, Harry L., Detection, Estimation, and Modulation Theory, John Wiley & Sons, Inc., New York, 1968.
Yamshikov, et la., Defektoskopiia, Academy of Sciences of the USSR, Moscow, USSR, 1986, vol. 3, 13-20 (in Russian).
Yamishikov et al. "On the improvement of the ultrasonic devices sensitivity", Defectoscopy, Academy of Sciences of the USSR, Moscow, USSR, 1986, vol. 3, 13-20 (English translation of 1#33 above).
Zeira et al., "Realizable Lower Bounds for Time Delay Estimation," IEEE Transactions on Signal Processing, vol. 41, No. 11, Nov. 1993.
Zeira et al., "Realizable Lower Bounds for Time Delay Estimation: Part 2--Threshold Phenomena," IEEE Transactions on Signal Processing, vol. 42, No. 5, May 1994.
Zeira et al., Realizable Lower Bounds for Time Delay Estimation, Ph.D. dissertation, Yale University, New Haven, CT, 1991.
Zipser et al. "Acoustic sensor for ternary gas analysis", Sensors and Actuators, B.26-27, 1995, 195-198.
Lee Patrick S.
Logue Raymond C.
Sirota Don N.
Klee Maurice M.
Lorex Industries, Inc.
Noori Max
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