US4078427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic flow or current meter
Assignee: Tokyo Keiki Inc
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Filing: 1975-06-27
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Granted: 1978-03-14
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Expires: 1995-06-27
Abstract
Abstract An ultrasonic flow or current meter having at least one pair of transducers, a transceiver which applies a pulse signal to one of the transducers to produce an ultrasonic pulse wave, the other transducer receiving the ultrasonic pulse wave and producing the corresponding electrical signal, a reference pulse signal generator, a counter for counting the pulse signals from the reference signal generator in relation to the corresponding electrical signal, and a logical operational circuit. The logical operational circuit is supplied with the output signal from the counter and calculates a difference between a first reciprocal of a time required for the ultrasonic pulse wave to propagate from one of the pair of transducers to the other transducer and a second reciprocal of a time required for the ultrasonic pulse wave to propagate in the reverse direction between the pair of transducers, with the difference between the first and second reciprocals being multiplied by a constant.
Inventors
- 👤 Yukio Yoshida
- 👤 Kazushi Suga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:15
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/66; G01F1/667
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
223 words
An ultrasonic sing-around flow meter comprising: (a) a pipe in which a fluid flows; (b) a pair of transducers mounted on said pipe and offset longitudinally from each other; (c) a transfer circuit connected to said pair of transducers; (d) a variable frequency generator connected to said transfer circuit and supplying an input thereto and receiving an output therefrom which controls its repetition frequency; (e) a clock pulse generator; (f) a timing circuit receiving an input from said clock pulse generator; (g) a sequence control circuit connected to said transfer circuit and supplying an output thereto and receiving an input from said clock pulse generator and timing circuit; (h) a gate receiving inputs from said clock pulse generator, said variable frequency generator and said sequence control circuit; (i) a counter receiving the output of said gate to count the number of clock pulses from said clock pulse generator passed by said gate; (j) a logical operational circuit connected to receive outputs of said counter to calculate a difference between a reciprocal of a repetition frequency of said variable frequency generator when a first of said transducers radiates and the other receives and a reciprocal of a repetition frequency when the other radiates and the first receives; and (k) an indicator connected to said logical operational circuit to indicate the velocity of said fluid.
Claim 2
Dependent Claim
223 words
An ultrasonic sing-around flow meter comprising: (a) a pipe in which a fluid flows; (b) a pair of transducers mounted on said pipe and offset longitudinally from each other; (c) a transfer circuit connected to said pair of transducers; (d) a variable frequency generator connected to said transfer circuit and supplying an input thereto and receiving an output therefrom which controls its repetition frequency; (e) a clock pulse generator; (f) a timing circuit receiving an input from said clock pulse generator; (g) a sequence control circuit connected to said transfer circuit and supplying an output thereto and receiving an input from said clock pulse generator and timing circuit; (h) a gate receiving inputs from said clock pulse generator, said variable frequency generator and said sequence control circuit; (i) a counter receiving the output of said gate to count the number of clock pulses from said clock pulse generator passed by said gate; (j) a logical operational circuit connected to receive outputs of said counter to calculate a difference between a reciprocal of a repetition frequency of said variable frequency generator when a first of said transducers radiates and the other receives and a reciprocal of a repetition frequency when the other radiates and the first receives; and (k) an indicator connected to said logical operational circuit to indicate the velocity of said fluid.
Claim 3
Dependent Claim
35 words
An ultrasonic flow meter according to claim 1 further including an integrating circuit connected to said logical operational circuit, and a second indicator connected to said integrating circuit and indicating the quantity of fluid flow.
Claim 4
Dependent Claim
21 words
An ultrasonic flow meter according to claim 2 including a frequency divider connected between said gate and said variable frequency generator.
Claim 5
Dependent Claim
33 words
An ultrasonic flow meter according to claim 3 including a second gate under the control of said sequence control circuit, said second gate being connected between said counter and said logical operational circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |