GB883902A - Improvements in or relating to impedance sensitive electronic apparatus - Google Patents
Improvements in or relating to impedance sensitive electronic apparatusInfo
- Publication number
- GB883902A GB883902A GB40025/57A GB4002557A GB883902A GB 883902 A GB883902 A GB 883902A GB 40025/57 A GB40025/57 A GB 40025/57A GB 4002557 A GB4002557 A GB 4002557A GB 883902 A GB883902 A GB 883902A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transducer
- circuit
- valve
- relating
- electronic apparatus
- 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
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
- G01F23/296—Acoustic waves
- G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
- G01F23/2967—Acoustic waves making use of acoustical resonance or standing waves for discrete levels
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
883,902. Automatic fluid level control systems. ACOUSTICA ASSOCIATES Inc. Dec. 24, 1957 [May 1, 1957], No. 40025/57. Class 38 (4). [Also in Group XL (c)] In apparatus for maintaining fluid material level constant by using impedance change of an electroacoustic transducer a regenerative oscillator circuit includes transducer 66, Fig. 6, in valve 60 cathode -circuit in series with relay 68 used for control purposes as in Specification 883,904. Valve 60 is operated near saturation and the average anode current rises substantially when oscillation amplitude is low corresponding to ultrasonic transducer 66 vibration damped by the material presence. For remote operation the transducer is coupled to the circuit via transformer-matched coaxial cable. A transistor circuit may be used (see Group XL (c)). Specification 883,903 also is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US883902XA | 1957-05-01 | 1957-05-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB883902A true GB883902A (en) | 1961-12-06 |
Family
ID=22211096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB40025/57A Expired GB883902A (en) | 1957-05-01 | 1957-12-24 | Improvements in or relating to impedance sensitive electronic apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB883902A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1387152A1 (en) * | 2001-05-08 | 2004-02-04 | Nohken Inc. | Coil impedance detection method and object detection method and apparatus using the same |
-
1957
- 1957-12-24 GB GB40025/57A patent/GB883902A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1387152A1 (en) * | 2001-05-08 | 2004-02-04 | Nohken Inc. | Coil impedance detection method and object detection method and apparatus using the same |
| EP1387152A4 (en) * | 2001-05-08 | 2013-08-28 | Nohken Inc | Coil impedance detection method and object detection method and apparatus using the same |
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