GB804901A - Capacitance bridge oscillator - Google Patents
Capacitance bridge oscillatorInfo
- Publication number
- GB804901A GB804901A GB8699/56A GB869956A GB804901A GB 804901 A GB804901 A GB 804901A GB 8699/56 A GB8699/56 A GB 8699/56A GB 869956 A GB869956 A GB 869956A GB 804901 A GB804901 A GB 804901A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bridge
- circuit
- inductance
- oscillator
- output
- 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
- G01F23/26—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/266—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
804,901. Electric tests. BENDIX AVIATION CORPORATION. March 20, 1956 [April 1, 1955], No. 8699/56. Class 37. [Also in Group XL (c)] In a system in which the depth of a liquid in a tank is arranged to vary the overall capacitance of a bridge circuit the bridge is associated with an inductance to form part of an oscillatory circuit the bridge output being connected to an output circuit. This arrangement is said to avoid the usual coupling between the oscillator and bridge circuits. As shown the oscillator comprises a triode 11 having a piezo crystal 15 and resistor 16 in its grid circuit its plate being connected through inductance 19 and resistor 21 to the supply. In parallel with inductance is a bridge circuit consisting of condensers 24, 25, 26, 27 and 28 and a trimming condenser 29. Condenser 28 may be as described in Specification 803,099 in which it is used for measuring the level of liquid oxygen in a container. The Specification states that the various capacitances involved are so chosen that the oscillator operates approximately mid-way between its resonant frequency and the second harmonic over a frequency range at which the input current to the bridge circuit is approximately constant. The output circuits connected across bridge diagonal II-IV comprises a double diode rectifier 32, smoothing condensers 44, 45, ammeter 24 and calibrating potentiometer 36.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US804901XA | 1955-04-01 | 1955-04-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB804901A true GB804901A (en) | 1958-11-26 |
Family
ID=22157715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8699/56A Expired GB804901A (en) | 1955-04-01 | 1956-03-20 | Capacitance bridge oscillator |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB804901A (en) |
-
1956
- 1956-03-20 GB GB8699/56A patent/GB804901A/en not_active Expired
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