JPS5754801A - Approach sensor for displacement detection - Google Patents

Approach sensor for displacement detection

Info

Publication number
JPS5754801A
JPS5754801A JP55131369A JP13136980A JPS5754801A JP S5754801 A JPS5754801 A JP S5754801A JP 55131369 A JP55131369 A JP 55131369A JP 13136980 A JP13136980 A JP 13136980A JP S5754801 A JPS5754801 A JP S5754801A
Authority
JP
Japan
Prior art keywords
transistor
circuit
variable resistance
displacement detection
resonance circuit
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.)
Pending
Application number
JP55131369A
Other languages
Japanese (ja)
Inventor
Tadayoshi Asada
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP55131369A priority Critical patent/JPS5754801A/en
Publication of JPS5754801A publication Critical patent/JPS5754801A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To obtain a voltage, proportional to a distance, at a wide range, by a method wherein a feedback amount to a resonance circuit is minutely controlled. CONSTITUTION:A means, which can minutely control a feedback amount to a resonance circuit, is provided. For example, one end of an LC oscillating circuit 20 is connected to a base of a transistor 11, and the other end to an emitter via a variable resistance 5 to perform a positive feedback from a collector via a resistance 10. The output of the transistor 11 is inputted to another transistor 16 via a smoothing circuit 21. This causes changing of an inductance if an object to be detected approaches a detecting coil 1, and the change is produced into the damping of an oscillating output. The adjustment of the variable resistance 5 permits the rapid or the gradual stoppage of an oscillation to obtain a sensor having a high resolution.
JP55131369A 1980-09-19 1980-09-19 Approach sensor for displacement detection Pending JPS5754801A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55131369A JPS5754801A (en) 1980-09-19 1980-09-19 Approach sensor for displacement detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55131369A JPS5754801A (en) 1980-09-19 1980-09-19 Approach sensor for displacement detection

Publications (1)

Publication Number Publication Date
JPS5754801A true JPS5754801A (en) 1982-04-01

Family

ID=15056315

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55131369A Pending JPS5754801A (en) 1980-09-19 1980-09-19 Approach sensor for displacement detection

Country Status (1)

Country Link
JP (1) JPS5754801A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6179471A (en) * 1984-09-20 1986-04-23 テレクトロニクス・エヌヴエ− Implant apparatus using telemeter coil in place of lead switch driven magnetically
US5574366A (en) * 1992-09-02 1996-11-12 Tiefenbach Gmbh Proximity switch having a variable sensing resistor for maintaining a constant total resistance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6179471A (en) * 1984-09-20 1986-04-23 テレクトロニクス・エヌヴエ− Implant apparatus using telemeter coil in place of lead switch driven magnetically
JPH0512949B2 (en) * 1984-09-20 1993-02-19 Telectronics Nv
US5574366A (en) * 1992-09-02 1996-11-12 Tiefenbach Gmbh Proximity switch having a variable sensing resistor for maintaining a constant total resistance

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