JPS5791473A - Electric field type human body detector - Google Patents

Electric field type human body detector

Info

Publication number
JPS5791473A
JPS5791473A JP55168917A JP16891780A JPS5791473A JP S5791473 A JPS5791473 A JP S5791473A JP 55168917 A JP55168917 A JP 55168917A JP 16891780 A JP16891780 A JP 16891780A JP S5791473 A JPS5791473 A JP S5791473A
Authority
JP
Japan
Prior art keywords
frequency
human body
proximity
announcing
side band
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
JP55168917A
Other languages
Japanese (ja)
Inventor
Yuji Takada
Hironobu Inoue
Hiroshi Ohashi
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP55168917A priority Critical patent/JPS5791473A/en
Publication of JPS5791473A publication Critical patent/JPS5791473A/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
    • G01V3/088—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 operating with electric fields

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)
  • Burglar Alarm Systems (AREA)

Abstract

PURPOSE:To eliminate the possibility of false announcing occuring due to higher harmonic noises generated synchronously with an electric power source completely by applying frequency modulation to a detection signal and removig the higher harmonic noise of the frequency in proximity with the side band wave thereof with a filter. CONSTITUTION:The signal frequency f0 of a voltage control oscillator 1b is modulated with the modulating frequency fm of a low frequency oscillator 1a, and is radiated from an exciting line 2. The wave to be modulated in a detection line 3 receiving this has the side band wave of the frequency (f0+fm), but the high frequency noise in proximity to the side band wave is removed by a notch filter 11, and therefore the beat frequency is relatively high and is blocked by a BPF6 so that it does not operate the succeeding comparator 7, hence there is no anxiety for causing false announcing. On the other hand, the ordinary detecting operation for a human body is accomplished by comparing the change level with a set level in a comparator 7 via a detecting circuit 5 and the BPF6 by the change in the voltage induced in the line 3 on account of a change in a capacity to human body owing to proximity of the haman body and operating an announcing circuit 8.
JP55168917A 1980-11-28 1980-11-28 Electric field type human body detector Pending JPS5791473A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55168917A JPS5791473A (en) 1980-11-28 1980-11-28 Electric field type human body detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55168917A JPS5791473A (en) 1980-11-28 1980-11-28 Electric field type human body detector

Publications (1)

Publication Number Publication Date
JPS5791473A true JPS5791473A (en) 1982-06-07

Family

ID=15876947

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55168917A Pending JPS5791473A (en) 1980-11-28 1980-11-28 Electric field type human body detector

Country Status (1)

Country Link
JP (1) JPS5791473A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100447822C (en) * 2004-02-20 2008-12-31 株式会社有信 Human body detection sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100447822C (en) * 2004-02-20 2008-12-31 株式会社有信 Human body detection sensor

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