JPS557601A - Thermometer - Google Patents
ThermometerInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1978
- 1978-02-28 JP JP2218978A patent/JPS557601A/en active Pending
Cited By (1)
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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