JPS57111486A - Object detecting sensor - Google Patents

Object detecting sensor

Info

Publication number
JPS57111486A
JPS57111486A JP55186979A JP18697980A JPS57111486A JP S57111486 A JPS57111486 A JP S57111486A JP 55186979 A JP55186979 A JP 55186979A JP 18697980 A JP18697980 A JP 18697980A JP S57111486 A JPS57111486 A JP S57111486A
Authority
JP
Japan
Prior art keywords
change
oscillator
detected
lpf1
inductance
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
JP55186979A
Other languages
Japanese (ja)
Inventor
Yoshio Sugiyama
Takeshi Kakihara
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.)
SUGIYAMA DENKI SEISAKUSHO KK
Original Assignee
SUGIYAMA DENKI SEISAKUSHO KK
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 SUGIYAMA DENKI SEISAKUSHO KK filed Critical SUGIYAMA DENKI SEISAKUSHO KK
Priority to JP55186979A priority Critical patent/JPS57111486A/en
Publication of JPS57111486A publication Critical patent/JPS57111486A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • 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)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

PURPOSE:To make the high sensitivity detection of microobjects possible by deciding the inductance of an oscillator which is feedback-controlled via a low pass filter and the like and the output of a frequency detector on account of the approach of the object to a capacitance in accordance with the threshold. CONSTITUTION:The oscillation frequency change of an oscillator OSC3 is detected with a frequency detector FD3, and is feedback-controlled via an LPF1, an oscillation frequency regulator AFC1, etc., whereby the influence of a change in ambient environments, etc. upon the change of the detecting coil L3 of the oscillator OSC3 is corrected and the oscillator OSC3 is operated stably. On the other hand, the detected output of a detector FD3 corresponding to the fluctuations with a short time of the case when a metallic piece M or the like approaches to the coil L3 in this state is shut off with the LPF1, whilst it is decided with a discriminator LDC3 set with the threshold, whereby the approaching of the microobject is detected stably without the influence of temp., humidity, etc. The same holds true of the case when the change in capacitance is utilized in place of an inductance.
JP55186979A 1980-12-29 1980-12-29 Object detecting sensor Pending JPS57111486A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55186979A JPS57111486A (en) 1980-12-29 1980-12-29 Object detecting sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55186979A JPS57111486A (en) 1980-12-29 1980-12-29 Object detecting sensor

Publications (1)

Publication Number Publication Date
JPS57111486A true JPS57111486A (en) 1982-07-10

Family

ID=16198069

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55186979A Pending JPS57111486A (en) 1980-12-29 1980-12-29 Object detecting sensor

Country Status (1)

Country Link
JP (1) JPS57111486A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62132487U (en) * 1986-02-13 1987-08-21

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62132487U (en) * 1986-02-13 1987-08-21

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