JPS557601A - Thermometer - Google Patents

Thermometer

Info

Publication number
JPS557601A
JPS557601A JP2218978A JP2218978A JPS557601A JP S557601 A JPS557601 A JP S557601A JP 2218978 A JP2218978 A JP 2218978A JP 2218978 A JP2218978 A JP 2218978A JP S557601 A JPS557601 A JP S557601A
Authority
JP
Japan
Prior art keywords
oscillator
temperature
standing wave
wave
velocity
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
JP2218978A
Other languages
Japanese (ja)
Inventor
Shigeru Fujimoto
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.)
SHINWA BOEKI KK
Original Assignee
SHINWA BOEKI KK
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 SHINWA BOEKI KK filed Critical SHINWA BOEKI KK
Priority to JP2218978A priority Critical patent/JPS557601A/en
Publication of JPS557601A publication Critical patent/JPS557601A/en
Pending legal-status Critical Current

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  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

PURPOSE: To correctly measure the temperature of fluid in a short response time, by detecting the phase difference determined by the temperature of ultrasonic wave to the standing wave and by taking this as the temperature measuring output with the PLL system.
CONSTITUTION: The ultrasonic wave at low frequency region from the carrier oscillator 6 is delivered in the tube B from the transmission element 1 toward the reception element 2 via the FM modulator 7 to produce the standing wave of one wave length between the elements 1 and 2. This standing wave is elongated in response to the velocity of fluid in the tube B, the frequency received with the element 2 is fs1, it is inputted to the comparison circuit 14 via the demodulator 13, and it is compared with the measured frequency signal f0 being the reference via the frequency divider 9 from the voltage controlled oscillator 8. Since the oscillator 8 produces the difference signal output voltage so that the oscillator 8 can zero the difference signal of fs1-f0 compared, it is counted at the count circuit 15. Further, the same processing is made at the system consisting of the transmission and reception elements 3 and 4, the both are added at the output circuit 16 to obtain the velocity of sound, and this is displayed by converting it to the temperature value.
COPYRIGHT: (C)1980,JPO&Japio
JP2218978A 1978-02-28 1978-02-28 Thermometer Pending JPS557601A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2218978A JPS557601A (en) 1978-02-28 1978-02-28 Thermometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2218978A JPS557601A (en) 1978-02-28 1978-02-28 Thermometer

Publications (1)

Publication Number Publication Date
JPS557601A true JPS557601A (en) 1980-01-19

Family

ID=12075841

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2218978A Pending JPS557601A (en) 1978-02-28 1978-02-28 Thermometer

Country Status (1)

Country Link
JP (1) JPS557601A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002062198A (en) * 2000-08-22 2002-02-28 Babcock Hitachi Kk Acoustic gas temperature measurement method and acoustic gas thermometer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002062198A (en) * 2000-08-22 2002-02-28 Babcock Hitachi Kk Acoustic gas temperature measurement method and acoustic gas thermometer

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