JPS5791475A - Electric field type human body detector - Google Patents

Electric field type human body detector

Info

Publication number
JPS5791475A
JPS5791475A JP55168919A JP16891980A JPS5791475A JP S5791475 A JPS5791475 A JP S5791475A JP 55168919 A JP55168919 A JP 55168919A JP 16891980 A JP16891980 A JP 16891980A JP S5791475 A JPS5791475 A JP S5791475A
Authority
JP
Japan
Prior art keywords
frequency
power source
detection signal
signal
source frequency
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.)
Granted
Application number
JP55168919A
Other languages
Japanese (ja)
Other versions
JPS6235632B2 (en
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 JP55168919A priority Critical patent/JPS5791475A/en
Publication of JPS5791475A publication Critical patent/JPS5791475A/en
Publication of JPS6235632B2 publication Critical patent/JPS6235632B2/ja
Granted 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 causing false announcing occuring due to higher harmonic noises caused synchronously with an electric power source completely by so arranging a titled detector that the frequency of the detection signal emitted from an exciting line is matched always to the integer times of the AC power source frequency. CONSTITUTION:The searching signal from a voltage control oscillator 1a is dropped down to an electric power source frequency which is a reference by a frequency divider 1b, and is applied as a reference signal to a phase comparator 1c. Now when a fluctuation occurs in an AC power source frequency, a deviation is produced between the AC power source frequency and the frequency of the reference signal which is the output of the frequency divider 1b. A comparator 1c detects this, feeds the control signal of the oscillator 1a, and outputs the detection signal of the frequency integer times the fluctuated AC power source frequency from the oscillator 1a. Then, in case when a fluctuation occurs in the AC power source frequency, the frequency of the detection signal is always equal to integer times of the AC power source frequency, that is, the frequency of any of the higher harmonic noise of the power source, whereby the generation of a beat between the detection signal and the higher harmonic noise is perfectly prevented.
JP55168919A 1980-11-28 1980-11-28 Electric field type human body detector Granted JPS5791475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55168919A JPS5791475A (en) 1980-11-28 1980-11-28 Electric field type human body detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55168919A JPS5791475A (en) 1980-11-28 1980-11-28 Electric field type human body detector

Publications (2)

Publication Number Publication Date
JPS5791475A true JPS5791475A (en) 1982-06-07
JPS6235632B2 JPS6235632B2 (en) 1987-08-03

Family

ID=15876982

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55168919A Granted JPS5791475A (en) 1980-11-28 1980-11-28 Electric field type human body detector

Country Status (1)

Country Link
JP (1) JPS5791475A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06289146A (en) * 1992-02-17 1994-10-18 Tatsuo Miyagawa Foreign matter detecting device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63176542U (en) * 1987-05-06 1988-11-16

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06289146A (en) * 1992-02-17 1994-10-18 Tatsuo Miyagawa Foreign matter detecting device

Also Published As

Publication number Publication date
JPS6235632B2 (en) 1987-08-03

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