JPS5689075A - Object detector - Google Patents

Object detector

Info

Publication number
JPS5689075A
JPS5689075A JP16594579A JP16594579A JPS5689075A JP S5689075 A JPS5689075 A JP S5689075A JP 16594579 A JP16594579 A JP 16594579A JP 16594579 A JP16594579 A JP 16594579A JP S5689075 A JPS5689075 A JP S5689075A
Authority
JP
Japan
Prior art keywords
impedance
terminal
comparator
antenna
appears
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
JP16594579A
Other languages
Japanese (ja)
Inventor
Tadao Shirai
Original Assignee
Nec Corp
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 Nec Corp filed Critical Nec Corp
Priority to JP16594579A priority Critical patent/JPS5689075A/en
Publication of JPS5689075A publication Critical patent/JPS5689075A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/04Systems determining presence of a target

Abstract

PURPOSE:To detect the difference between the impedance of an antenna and a reference impedance and detect an object by making use of the fact that the balance state between said impedances assumes an unbalance state when the object appears. CONSTITUTION:A microwave oscillator 10 and a comparator 70 which is connected with an antenna 30 to its 1st terminal, a reference impedance element 80 to its 2nd terminal and signal detecting circuit 20 to its 3rd terminal are provided. The impedance of the reference impedance 80 is so set that the impedance of the 1st terminal and 2nd terminal of the comparator 70 are made equal. When an object 40 appears on the antenna 30 side, the balance state of the comparator 70 is broken by the signal reflected by this, and the signal based on this is passed through a detector 20, and a DC amplifier 50, so that an alarm device etc. 60 is operated. Hence, the presence or absence of either moving or static object is surely detected because the impedance difference is used.
JP16594579A 1979-12-20 1979-12-20 Object detector Pending JPS5689075A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16594579A JPS5689075A (en) 1979-12-20 1979-12-20 Object detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16594579A JPS5689075A (en) 1979-12-20 1979-12-20 Object detector

Publications (1)

Publication Number Publication Date
JPS5689075A true JPS5689075A (en) 1981-07-20

Family

ID=15821997

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16594579A Pending JPS5689075A (en) 1979-12-20 1979-12-20 Object detector

Country Status (1)

Country Link
JP (1) JPS5689075A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01285884A (en) * 1988-05-12 1989-11-16 Omron Tateisi Electron Co Microwave proximity switch
EP1851738A1 (en) * 2005-02-22 2007-11-07 Chubb Inertnational Holdings Limited Antenna impedance-based apparatus and method for detecting a breach in the integrity of a container

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4890697A (en) * 1972-03-06 1973-11-26
JPS5128799A (en) * 1974-09-04 1976-03-11 Matsushita Electric Ind Co Ltd MAIKURO HASENSAA

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4890697A (en) * 1972-03-06 1973-11-26
JPS5128799A (en) * 1974-09-04 1976-03-11 Matsushita Electric Ind Co Ltd MAIKURO HASENSAA

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01285884A (en) * 1988-05-12 1989-11-16 Omron Tateisi Electron Co Microwave proximity switch
EP1851738A1 (en) * 2005-02-22 2007-11-07 Chubb Inertnational Holdings Limited Antenna impedance-based apparatus and method for detecting a breach in the integrity of a container
EP1851738A4 (en) * 2005-02-22 2009-09-23 Chubb Inertnat Holdings Ltd Antenna impedance-based apparatus and method for detecting a breach in the integrity of a container

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