GB977125A - Electric bridges - Google Patents

Electric bridges

Info

Publication number
GB977125A
GB977125A GB3487/63A GB348763A GB977125A GB 977125 A GB977125 A GB 977125A GB 3487/63 A GB3487/63 A GB 3487/63A GB 348763 A GB348763 A GB 348763A GB 977125 A GB977125 A GB 977125A
Authority
GB
United Kingdom
Prior art keywords
bridge
unbalance
diode
output
rectified
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
Application number
GB3487/63A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bendix Corp
Original Assignee
Bendix Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US170561A external-priority patent/US3164990A/en
Application filed by Bendix Corp filed Critical Bendix Corp
Publication of GB977125A publication Critical patent/GB977125A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/10—AC or DC measuring bridges
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/60—Analogue/digital converters with intermediate conversion to frequency of pulses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Theoretical Computer Science (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Oscillators With Electromechanical Resonators (AREA)

Abstract

977,125. Electric bridge circuits; determining liquid level. BENDIX CORPORATION. Jan. 28, 1963 [Feb. 2, 1962; Feb. 23, 1962], No. 3487/63. Headings G1N and G1U. [Also in Division H3] An impedance bridge which is excited from an A.C. source 28 includes in one of its legs a device 22 such as a liquid quantity guage which has a varying capacitive reactance which may unbalance the bridge; the unbalance output of the bridge is amplified (in the amplifier 40) and rectified (in the rectifier 42) and coupled back to a semiconductor diode 12 included in a second leg of the bridge, in such a way that the capacitance of this diode alters so as to automatically rebalance the bridge. The diode 12 is operated below its conduction level. An output may be obtained from the bridge by using the rectified unbalance voltage to control a Pierce type oscillator 14 which includes a transistor 16 and a crystal 50. The varying unbalance voltage from the bridge acts so as to alter the collector-base capacitance of the transistor 16 and thus the output frequency of the oscillator, which is measured at the terminals XX. Changes in frequency are thus representative of changes in liquid quantity in the vessel 24.
GB3487/63A 1962-02-02 1963-01-28 Electric bridges Expired GB977125A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US170561A US3164990A (en) 1962-02-02 1962-02-02 Flowmetering
US17514362A 1962-02-23 1962-02-23

Publications (1)

Publication Number Publication Date
GB977125A true GB977125A (en) 1964-12-02

Family

ID=26866223

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3487/63A Expired GB977125A (en) 1962-02-02 1963-01-28 Electric bridges

Country Status (2)

Country Link
FR (1) FR1348051A (en)
GB (1) GB977125A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982002595A1 (en) * 1981-01-23 1982-08-05 Inc Rosemount Reactance measurement circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982002595A1 (en) * 1981-01-23 1982-08-05 Inc Rosemount Reactance measurement circuit

Also Published As

Publication number Publication date
FR1348051A (en) 1964-01-04

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