JPH0119526B2 - - Google Patents
Info
- Publication number
- JPH0119526B2 JPH0119526B2 JP56139744A JP13974481A JPH0119526B2 JP H0119526 B2 JPH0119526 B2 JP H0119526B2 JP 56139744 A JP56139744 A JP 56139744A JP 13974481 A JP13974481 A JP 13974481A JP H0119526 B2 JPH0119526 B2 JP H0119526B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric vibrator
- oscillation
- circuit
- frequency
- detection
- 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.)
- Expired
Links
- 230000010355 oscillation Effects 0.000 claims description 43
- 238000001514 detection method Methods 0.000 claims description 37
- 239000000696 magnetic material Substances 0.000 claims 1
- 238000004804 winding Methods 0.000 description 20
- 239000006247 magnetic powder Substances 0.000 description 16
- 239000000126 substance Substances 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Geophysics And Detection Of Objects (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56139744A JPS5841321A (ja) | 1981-09-07 | 1981-09-07 | 磁性体検知装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56139744A JPS5841321A (ja) | 1981-09-07 | 1981-09-07 | 磁性体検知装置 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5841321A JPS5841321A (ja) | 1983-03-10 |
| JPH0119526B2 true JPH0119526B2 (ru) | 1989-04-12 |
Family
ID=15252361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56139744A Granted JPS5841321A (ja) | 1981-09-07 | 1981-09-07 | 磁性体検知装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5841321A (ru) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4655283B2 (ja) * | 2006-06-21 | 2011-03-23 | セイコーエプソン株式会社 | 液体消費状態検出器 |
| JP2006343337A (ja) * | 2006-06-21 | 2006-12-21 | Seiko Epson Corp | 液体消費状態検出器 |
-
1981
- 1981-09-07 JP JP56139744A patent/JPS5841321A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5841321A (ja) | 1983-03-10 |
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