JPS5745413A - Ultrasonic type flowmeter - Google Patents

Ultrasonic type flowmeter

Info

Publication number
JPS5745413A
JPS5745413A JP12106280A JP12106280A JPS5745413A JP S5745413 A JPS5745413 A JP S5745413A JP 12106280 A JP12106280 A JP 12106280A JP 12106280 A JP12106280 A JP 12106280A JP S5745413 A JPS5745413 A JP S5745413A
Authority
JP
Japan
Prior art keywords
signal
circuit
abnormality
inputted
voltage
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.)
Granted
Application number
JP12106280A
Other languages
Japanese (ja)
Other versions
JPS6148843B2 (en
Inventor
Masao Fukunaga
Hitoshi Kanazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12106280A priority Critical patent/JPS5745413A/en
Publication of JPS5745413A publication Critical patent/JPS5745413A/en
Publication of JPS6148843B2 publication Critical patent/JPS6148843B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
    • G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

PURPOSE:To obtain an ultrasonic type flowmeter which makes stable measurement possible in spite of abnormality in long-time detection by resetting a voltage holding means holding the voltage conversion signal from a transmitter-receiver by an abnormality signal at every constant time. CONSTITUTION:The voltage-converted DELTAT/V conversion signal 13 from the transmitter-receiver of an ultrasonic flowmeter is integrated by an operational amplifier 15 at the time constant determined by a resistance R1 and a capacitor 16 via an electronic switch 14, is applied with the bias of a reference electric power source 17, and is inputted to a voltage control oscillator (VCO)8 controlling the generation timing of the transmission pulses of an ultrasonic wave transmission circuit. When inputted with a reception abnormality signal 19, the switch 14 goes off, and causes the value of an integrating circuit to be held. An electronic switch 22 connected in parallel with the capacitor 16 is turned on by the output of a counter circuit 20 counting pulse signal inputs 21 by the signal 19. If the flowmeter is constituted in this way, the integrating circuit is reset by the output of every constant period of the circuit 20, granting that abnormality signals are inputted for a long period of time and therefore the drift of the integrating circuit is corrected.
JP12106280A 1980-09-03 1980-09-03 Ultrasonic type flowmeter Granted JPS5745413A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12106280A JPS5745413A (en) 1980-09-03 1980-09-03 Ultrasonic type flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12106280A JPS5745413A (en) 1980-09-03 1980-09-03 Ultrasonic type flowmeter

Publications (2)

Publication Number Publication Date
JPS5745413A true JPS5745413A (en) 1982-03-15
JPS6148843B2 JPS6148843B2 (en) 1986-10-27

Family

ID=14801889

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12106280A Granted JPS5745413A (en) 1980-09-03 1980-09-03 Ultrasonic type flowmeter

Country Status (1)

Country Link
JP (1) JPS5745413A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5000039A (en) * 1989-11-21 1991-03-19 Siemens-Bendix Automotive Electronics L.P. Mass air flow integrator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH048028Y2 (en) * 1987-09-07 1992-03-02
JPS6455180U (en) * 1987-10-02 1989-04-05

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5000039A (en) * 1989-11-21 1991-03-19 Siemens-Bendix Automotive Electronics L.P. Mass air flow integrator

Also Published As

Publication number Publication date
JPS6148843B2 (en) 1986-10-27

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