JPS5689075A - Object detector - Google Patents
Object detectorInfo
- 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
- detect
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO 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
- G01S13/00—Systems 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
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/04—Systems determining presence of a target
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
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.
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)
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)
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 |
-
1979
- 1979-12-20 JP JP16594579A patent/JPS5689075A/en active Pending
Patent Citations (2)
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)
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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