JPS5582925A - Ultrasonic flow meter - Google Patents
Ultrasonic flow meterInfo
- Publication number
- JPS5582925A JPS5582925A JP15622978A JP15622978A JPS5582925A JP S5582925 A JPS5582925 A JP S5582925A JP 15622978 A JP15622978 A JP 15622978A JP 15622978 A JP15622978 A JP 15622978A JP S5582925 A JPS5582925 A JP S5582925A
- Authority
- JP
- Japan
- Prior art keywords
- receivers
- circuits
- pipe
- fluctuation
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
PURPOSE:To stop measurement when an abnormality such as the invasion of extraneous substance or the vibration of a pipe takes place, by utilizing ultrasonic waves which are propagated through the wall of the pipe, reflected on its inside surface and come back into receivers. CONSTITUTION:Selection circuits 14c, 14d, which extract only the outputs of receivers 12a, 12b corresponding to ultrasonic waves VN1, VN2 propagated through the wall of a pipe and reflected on its inside surface, and amplitude detection circuits 15c, 15d, which generate output signals proportional to the amplitudes of the outputs of the selection circuits, are added. Fluctuation detection circuits 16a, 16b made of differentiation circuits or the like detect the fluctuation in the output signals of the receivers 12a, 12b. When the fluctuation exceeds a prescribed level, an output signal is supplied to an OR circuit 17. When at least one input signal is applied to the OR circuit, it generates an output signal to keep a comparison circuit 7 out of operation. As a result, a flow rate is not measured when an error is likely to take place. Therefore, the accuracy of the measurement is raised.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15622978A JPS5582925A (en) | 1978-12-20 | 1978-12-20 | Ultrasonic flow meter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15622978A JPS5582925A (en) | 1978-12-20 | 1978-12-20 | Ultrasonic flow meter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5582925A true JPS5582925A (en) | 1980-06-23 |
Family
ID=15623174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15622978A Pending JPS5582925A (en) | 1978-12-20 | 1978-12-20 | Ultrasonic flow meter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5582925A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09236483A (en) * | 1996-03-01 | 1997-09-09 | Matsushita Electric Ind Co Ltd | Seismometer |
-
1978
- 1978-12-20 JP JP15622978A patent/JPS5582925A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09236483A (en) * | 1996-03-01 | 1997-09-09 | Matsushita Electric Ind Co Ltd | Seismometer |
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