JPS54100797A - Liquid detector - Google Patents
Liquid detectorInfo
- Publication number
- JPS54100797A JPS54100797A JP773778A JP773778A JPS54100797A JP S54100797 A JPS54100797 A JP S54100797A JP 773778 A JP773778 A JP 773778A JP 773778 A JP773778 A JP 773778A JP S54100797 A JPS54100797 A JP S54100797A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- capacitor
- oscillator
- frequency
- liquid
- 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
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
PURPOSE: To detect existence of a liquid in a tube thereby to generate control signals by detecting the beats which are generated in accordance with the variation in the cacity of a capacitor made up of electrodes attached to the tube.
CONSTITUTION: A capacitor is made up of conductors 2 and 3 which are attached in a facing manner to a tube made of a relatively thin insulating material. Another capacitor is made up of conductors 5 and 6 which are arranged at a preset spacing in the longitudinal direction of a thicker tube 4. The output of a first oscillator 8, which has its oscillatory frequency determined by the capacitor 7 thus made, and the output of a second oscillator 9, which is operative to generate a preset frequency substantially equal to the frequency of the oscillator 8 in case a liquid exists in the tube 1 or 4, are mixed by a mixer 10 to generate beats so that their high frequency components is filtered by means of a frequency separator 11 and converted into a voltage by means of a detector 12. The output voltage of the detector 12 is compared with the reference voltage by means of a comparator 13 so that the existence of the liquid in the tube can be easily detected to generate control signals S.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP773778A JPS54100797A (en) | 1978-01-24 | 1978-01-24 | Liquid detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP773778A JPS54100797A (en) | 1978-01-24 | 1978-01-24 | Liquid detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS54100797A true JPS54100797A (en) | 1979-08-08 |
Family
ID=11674006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP773778A Pending JPS54100797A (en) | 1978-01-24 | 1978-01-24 | Liquid detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS54100797A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01132985A (en) * | 1987-09-21 | 1989-05-25 | Fisher Scient Co | Detection apparatus and method for identifying fluid of different characteristic |
| JPH02126148A (en) * | 1988-11-02 | 1990-05-15 | Koden Electron Co Ltd | Detector for liquid passing condition |
| JP2006047151A (en) * | 2004-08-05 | 2006-02-16 | Toshikazu Sato | Liquid measurement system and liquid measurement method |
-
1978
- 1978-01-24 JP JP773778A patent/JPS54100797A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01132985A (en) * | 1987-09-21 | 1989-05-25 | Fisher Scient Co | Detection apparatus and method for identifying fluid of different characteristic |
| JPH02126148A (en) * | 1988-11-02 | 1990-05-15 | Koden Electron Co Ltd | Detector for liquid passing condition |
| JP2006047151A (en) * | 2004-08-05 | 2006-02-16 | Toshikazu Sato | Liquid measurement system and liquid measurement method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS53114608A (en) | Defect detector | |
| JPS54100797A (en) | Liquid detector | |
| JPS53113462A (en) | Frequency discriminator | |
| JPS5676636A (en) | Variable oscillation circuit | |
| JPS5410621A (en) | Detection circuit for normal tuning frequency | |
| JPS55111661A (en) | Conversion signal synchronizing device | |
| JPS55607A (en) | Frequency discriminator | |
| JPS5453901A (en) | Channel selector | |
| JPS51118996A (en) | Material detector | |
| JPS56150361A (en) | Surface electrometer | |
| JPS5614955A (en) | Power-factor detection circuit | |
| JPS52130675A (en) | Measuring apparatus for carrier wave signal power | |
| JPS5481062A (en) | Relay | |
| JPS5395674A (en) | High sensitivity signal detection system | |
| JPS5539053A (en) | Angle detecting circuit | |
| JPS5244149A (en) | Synchronous detection circuit | |
| JPS57204414A (en) | Process converter | |
| JPS5297623A (en) | Phase detection unit | |
| JPS556262A (en) | Frequency detector | |
| JPS53123978A (en) | Phase discriminator | |
| JPS5694275A (en) | Frequency detector | |
| JPS5219578A (en) | Voltage change detection circuit | |
| JPS5380154A (en) | Phase detection circuit | |
| JPS5360674A (en) | Converter for power-factor and dc signal | |
| JPS5384143A (en) | Automatically controlled electrolled electric source device |