JPS55158562A - Flow velocity measuring apparatus - Google Patents

Flow velocity measuring apparatus

Info

Publication number
JPS55158562A
JPS55158562A JP6712479A JP6712479A JPS55158562A JP S55158562 A JPS55158562 A JP S55158562A JP 6712479 A JP6712479 A JP 6712479A JP 6712479 A JP6712479 A JP 6712479A JP S55158562 A JPS55158562 A JP S55158562A
Authority
JP
Japan
Prior art keywords
thermistor
flow velocity
voltage
division
measuring
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
JP6712479A
Other languages
Japanese (ja)
Other versions
JPS5948341B2 (en
Inventor
Saburo Okada
Masaaki Imaide
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.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
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 Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Priority to JP6712479A priority Critical patent/JPS5948341B2/en
Publication of JPS55158562A publication Critical patent/JPS55158562A/en
Publication of JPS5948341B2 publication Critical patent/JPS5948341B2/en
Expired legal-status Critical Current

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  • Measuring Volume Flow (AREA)
  • Details Of Flowmeters (AREA)

Abstract

PURPOSE: To accomplish automatic compensation for the temperature change in the fluid by means of a feed back circuit including division circuits provided on the flow velocity measuring apparatus employing heated thermistor.
CONSTITUTION: A thermistor Th1 for measuring flow velocity and a thermistor Th2 for measuring temperature are placed into the fluid to be measured. The thermistor Tw1 generates heat by itself to develop voltages V1 and V2 across the resistance R1. The voltage V1 undergoes the division DV1 and the subtraction SUB while the voltage V2 undergoes the division DV2. The two outputs are multiplied to obtain the voltage proportional to the power consumption of the thermistor Th1 for measuring flow velocity. The voltage is substituted for the flow velocity and outputted. The division circuit DIV determines the voltage proportional to the resistance value of the thermistor Th1 and the current flowing through the thermistor Th1 for measuring flow velocity, namely, heating temperature is controlled with the voltage from the preamplifier Pr2 as the reference. Thus, the temperature change in the fluid can be automatically compensated for.
COPYRIGHT: (C)1980,JPO&Japio
JP6712479A 1979-05-29 1979-05-29 Flow rate measuring device Expired JPS5948341B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6712479A JPS5948341B2 (en) 1979-05-29 1979-05-29 Flow rate measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6712479A JPS5948341B2 (en) 1979-05-29 1979-05-29 Flow rate measuring device

Publications (2)

Publication Number Publication Date
JPS55158562A true JPS55158562A (en) 1980-12-10
JPS5948341B2 JPS5948341B2 (en) 1984-11-26

Family

ID=13335832

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6712479A Expired JPS5948341B2 (en) 1979-05-29 1979-05-29 Flow rate measuring device

Country Status (1)

Country Link
JP (1) JPS5948341B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5212983A (en) * 1991-03-18 1993-05-25 Novar Electronics Corporation Air flow sensor and detecting method
JPH05263589A (en) * 1990-12-17 1993-10-12 Daiho Constr Co Ltd Shield tunneling machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05263589A (en) * 1990-12-17 1993-10-12 Daiho Constr Co Ltd Shield tunneling machine
US5212983A (en) * 1991-03-18 1993-05-25 Novar Electronics Corporation Air flow sensor and detecting method

Also Published As

Publication number Publication date
JPS5948341B2 (en) 1984-11-26

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