Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1983-07-29
1985-05-07
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
73597, G01F 166
Patent
active
045150214
ABSTRACT:
An intervalometer for determining the transit time of an ultrasonic energy pulse through a fluid medium employs an automatic gain control amplifier circuit for amplitude stabilizing the electrical signal derived at a receiving transducer. The automatic gain control circuit tracks both a rapidly increasing and a rapidly decreasing signal amplitude. In various embodiments, synchronous switching can be employed in conjunction with a single amplifier and a plurality of storage elements to rapidly scan a plurality of signal paths and for providing automatic gain control capability on each path. The intervalometer further has a "slipped cycle" capability for accurately determining arrival time when is is known that the signal pulse will be within a certain range of times. In addition, the relative time difference between two arriving signal pulses can be accurately determined using this method so long as the range of time difference is sufficiently small. The intervalometer also provides for bad data rejection based upon limits applied to either transit time or signal amplitude.
REFERENCES:
patent: 3869915 (1975-03-01), Baumoel
patent: 3918304 (1975-11-01), Abruzzo et al.
patent: 3954008 (1976-05-01), Yamamoto et al.
patent: 3981191 (1976-09-01), Brown et al.
patent: 4022058 (1977-05-01), Brown
patent: 4028938 (1977-06-01), Eck
patent: 4080574 (1978-03-01), Loosemore et al.
patent: 4172250 (1979-10-01), Guignard
patent: 4183244 (1980-01-01), Kohno et al.
patent: 4205555 (1980-06-01), Hashiguchi
patent: 4232548 (1980-11-01), Baumoel
patent: 4451797 (1984-05-01), Bains, Jr.
Mitsuta, "Sonic Anemometer-Thermometer for Atmospheric Turbulence Measurements", in Flow, its Measure and Control in Science and Industry, Dowdell (Ed.), vol. I, Part I, pp. 341-344, Instrument Society of America, 1974.
Schmidt, "Acoustical Method for Fast Detection and Measurement of Vortices in Wind Tunnels", ICIASF '75 Record, pp. 216-218, 1975.
Crawford et al., "Multipath Artifact Corrections in Ultrasonic Transmission Tomography", Ultrasonic Imaging, vol. 4, pp. 234-266, 1982.
"Linear Databook", National Semiconductor Corporation, pp. 9-79--9-84, 1982.
Biber et al., "The Polaroid Ultrasonic Ranging System", Audio Engineering Society, pp. 6-7, 1980.
Korba James M.
Lynnworth Lawrence C.
Matson James E.
Wallace David R.
Panametrics, Inc.
Ruehl Charles A.
LandOfFree
Intervalometer time measurement apparatus and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Intervalometer time measurement apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intervalometer time measurement apparatus and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1792519