Differential phase velocity determining delay measurement appara

Details Differential phase velocity determining delay measurement appara Differential phase velocity determining delay measurement appara

1995-11-28

1997-12-16

Oda, Christine K.

Measuring and testing

Vibration

By mechanical waves

73617, G01N 2900

Patent

active

056987862

ABSTRACT:
An apparatus includes an ultrasonic delay sensor or device having a delay related to the sensed quantity; a pulse recirculating circuit for recirculating pulses through the ultrasonic delay sensor for generating a pulse repetition signal having a frequency related to delay of the ultrasonic delay sensor; and an output circuit for generating an output signal related to delay in the ultrasonic delay sensor based upon a difference in phase velocity between the pulse repetition signal and a time base signal. The output circuit preferably includes a first multiplier for multiplying the pulse repetition signal by a first number, and a second multiplier for multiplying the time base signal by a second number to have a frequency substantially the same as the multiplied pulse repetition signal. The effects of undesired reflections in the ultrasonic delay device may also be reduced or suppressed. Method aspects of the invention are also disclosed.

REFERENCES:
patent: 3596182 (1971-07-01), Menard
patent: 3906213 (1975-09-01), Meriaux et al.
patent: 4312228 (1982-01-01), Wohltjen
patent: 4315228 (1982-02-01), Moore
patent: 4512198 (1985-04-01), Sinha et al.
patent: 4534223 (1985-08-01), Sinha et al.
patent: 4895017 (1990-01-01), Pyke et al.
patent: 4995019 (1991-02-01), Begin
patent: 5012668 (1991-05-01), Haworth
patent: 5076094 (1991-12-01), Frye et al.
patent: 5117146 (1992-05-01), Martin et al.
patent: 5129262 (1992-07-01), White et al.
patent: 5235235 (1993-08-01), Martin et al.
patent: 5283037 (1994-02-01), Baer et al.
patent: 5289715 (1994-03-01), Staples et al.
patent: 5323636 (1994-06-01), McGowan et al.
patent: 5325704 (1994-07-01), Mariani et al.
patent: 5384541 (1995-01-01), Chu et al.
N.R. Karpov, Yu. D. Matyukhin, & N.N. Povarenkin, "Time-Interval Measurement by Regressive Coincidence" (Jan. 1980, Instruments & Experimental Techniques, pp. 1317-1318).
V.P. Voronov, V.M. Malyshev, & V.M. Merkulov, "Time-Delay Measuring Circuit for a Wave Pulse Used in Acoustic Experiments" (Jan. 1980, Instruments & Experimental Techniques, pp. 172-173).
R.A. Zakarevicius, E.H. Fooks & C.J.E. Phillips, "The Integrator as a Time Delay Estimator" (ICASSP 86, Tokyo, pp. 1861-1864) (Apr. 1986).
Giesler et al., Sensors and Actuators B, vol. B18, No. 1/3 (Mar. 1994), pp. 103-106, "Electrostatically Excited and Capacitively Detected Flexural Plate Waves on Thin Silicon Nitride Membranes With Chemical Sensors Applications".
Ramachandraiah et al., Journal of Physics E. Scientific Instruments, vol. 20, No. 1, (Jan. 1987), pp. 85-87, "An Ultrasonic Sing-Around System for Thin Solid Samples".

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