JPS5749813A - Ultrasonic flowmeter - Google Patents

Ultrasonic flowmeter

Info

Publication number
JPS5749813A
JPS5749813A JP55125773A JP12577380A JPS5749813A JP S5749813 A JPS5749813 A JP S5749813A JP 55125773 A JP55125773 A JP 55125773A JP 12577380 A JP12577380 A JP 12577380A JP S5749813 A JPS5749813 A JP S5749813A
Authority
JP
Japan
Prior art keywords
phase difference
frequency
fluid
ultrasonic wave
speed
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
Application number
JP55125773A
Other languages
Japanese (ja)
Inventor
Shinzo Takada
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP55125773A priority Critical patent/JPS5749813A/en
Publication of JPS5749813A publication Critical patent/JPS5749813A/en
Pending 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 sense a flow rate of fluid highly accurately regardless of the effects of temperature, concentration, and the like of the fluid, by obtaining the total phase difference by using the phase difference obtained from a frequency modulated to 1/m and the phase difference from an unmodulated frequency. CONSTITUTION:Ultrasonic wave transmitting and receiving elements 12 and 13 are provided in a pipe 11 and the ultrasonic wave transmission and reception are switched by switches SW1 and SW2. When SW3 is ON, a transmittting output circuit 16 transmits 12 the ultrasonic wave which is obtained by modulating 15 a frequency f1 by a frequency f2. The frequency signal is amplifies 19, the phase difference theta1 in the ultrasonic wave due to the pipe is obtained by a f2 demodulator 21, and 2pin1+theta2 is obtained by multiplying the result by m 26. When SW3 is OFF, the transmitting output circuit 16 transmits 12 f1, the received signal is amplifies 19, 2nd the phase difference theta3 is obtained. The inverse number of 1 2pin1+theta3 which is obtained by an adder 24 is the sum of a sound speed C and a fluid speed V. Then the difference in the sound speed C and the fluid speed is obtained by the similar way by reversing SW1 to SW2. Then, the fluid speed is obtained by eliminating the sound speed C.
JP55125773A 1980-09-10 1980-09-10 Ultrasonic flowmeter Pending JPS5749813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55125773A JPS5749813A (en) 1980-09-10 1980-09-10 Ultrasonic flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55125773A JPS5749813A (en) 1980-09-10 1980-09-10 Ultrasonic flowmeter

Publications (1)

Publication Number Publication Date
JPS5749813A true JPS5749813A (en) 1982-03-24

Family

ID=14918471

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55125773A Pending JPS5749813A (en) 1980-09-10 1980-09-10 Ultrasonic flowmeter

Country Status (1)

Country Link
JP (1) JPS5749813A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5931411A (en) * 1982-05-17 1984-02-20 エアコ・インコ−ポレ−テツド Ultrasonic current meter and method of measuring velocity of flow
JP2008528980A (en) * 2005-01-31 2008-07-31 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Ultrasonic flow sensor using modulo 2pi residual tracking

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5931411A (en) * 1982-05-17 1984-02-20 エアコ・インコ−ポレ−テツド Ultrasonic current meter and method of measuring velocity of flow
JP2008528980A (en) * 2005-01-31 2008-07-31 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Ultrasonic flow sensor using modulo 2pi residual tracking
JP4904289B2 (en) * 2005-01-31 2012-03-28 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Ultrasonic flow sensor using modulo 2pi residue tracking

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