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GB1245733A - A circuit arrangement for sensing moving objects without physical contact - Google Patents

A circuit arrangement for sensing moving objects without physical contact

Info

Publication number
GB1245733A
GB1245733A GB3513/70A GB351370A GB1245733A GB 1245733 A GB1245733 A GB 1245733A GB 3513/70 A GB3513/70 A GB 3513/70A GB 351370 A GB351370 A GB 351370A GB 1245733 A GB1245733 A GB 1245733A
Authority
GB
United Kingdom
Prior art keywords
oscillator
output
diode
feedback
jan
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
GB3513/70A
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.)
Mannesmann VDO AG
Original Assignee
Mannesmann VDO AG
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
Application filed by Mannesmann VDO AG filed Critical Mannesmann VDO AG
Publication of GB1245733A publication Critical patent/GB1245733A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
    • G01V3/101—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

1,245,733. Proximity switches; switching transistor oscillators. VDO TACHOMETER WERKE ADOLF SCHINDLING G.m.b.H. 23 Jan., 1970 [25 Jan., 1969] No. 3513/70. Heading H3T. [Also in Division G1] In a damped oscillator type proximity switch, feedback is varied with the oscillator output to provide a SNAP-ACTION IN/OUT of OSCILLATION, to avoid the need for a subsequent trigger circuit. As shown, a Colpitt's oscillator Tr 1 has a capacitance-diode (or voltage sensitive capacitor) Co controlled by overall feedback through R 1 to vary the "feedback factor" of the oscillator. The oscillator output is amplified by Tr 2 and rectified by diode D to apply bias of a polarity that the output of Tr 3 increases as the oscillations decrease, whereby capacitor-diode Co further reduces oscillation. A recorder may be connected to the output of Tr 3 . Applications.-Counting objects; measuring length of objects moving at a predetermined speed; tachometer generator used in conjunction with a driven magnet-wheel.
GB3513/70A 1969-01-25 1970-01-23 A circuit arrangement for sensing moving objects without physical contact Expired GB1245733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691903736 DE1903736B2 (en) 1969-01-25 1969-01-25 CIRCUIT ARRANGEMENT FOR CONTACTLESS SCANNING OF MOVING METALLIC OBJECTS

Publications (1)

Publication Number Publication Date
GB1245733A true GB1245733A (en) 1971-09-08

Family

ID=5723375

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3513/70A Expired GB1245733A (en) 1969-01-25 1970-01-23 A circuit arrangement for sensing moving objects without physical contact

Country Status (3)

Country Link
DE (1) DE1903736B2 (en)
FR (1) FR2029095B1 (en)
GB (1) GB1245733A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259637A (en) 1977-07-22 1981-03-31 Ransome Hoffmann Pollard Limited Mechanical assemblies employing sensing means for sensing motion or position

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1482206A (en) * 1966-04-15 1967-05-26 Compteurs Comp D Improvements to proximity sensors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259637A (en) 1977-07-22 1981-03-31 Ransome Hoffmann Pollard Limited Mechanical assemblies employing sensing means for sensing motion or position

Also Published As

Publication number Publication date
FR2029095B1 (en) 1974-09-20
FR2029095A1 (en) 1970-10-16
DE1903736B2 (en) 1972-02-24
DE1903736A1 (en) 1970-07-30

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