JPS5767869A - Detector for intrusion - Google Patents

Detector for intrusion

Info

Publication number
JPS5767869A
JPS5767869A JP14392880A JP14392880A JPS5767869A JP S5767869 A JPS5767869 A JP S5767869A JP 14392880 A JP14392880 A JP 14392880A JP 14392880 A JP14392880 A JP 14392880A JP S5767869 A JPS5767869 A JP S5767869A
Authority
JP
Japan
Prior art keywords
target
reflected
time
ultrasonic
transmission
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
JP14392880A
Other languages
Japanese (ja)
Inventor
Takeshi Yamazaki
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP14392880A priority Critical patent/JPS5767869A/en
Publication of JPS5767869A publication Critical patent/JPS5767869A/en
Pending legal-status Critical Current

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
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/04—Systems determining presence of a target

Abstract

PURPOSE:To detect intrusion surely without receiving the influence of the waves reflected from surrounding objects by discriminating successively whether the reflected waves are received or not after a prescribed time since the transmission of ultrasonic pulses of every constant time. CONSTITUTION:By the command of a control part 10, a transmitter 1 is operated at every constant time to transmit ultrasonic pulses successively at every constant time from an antenna 4 toward a target. When it comes to just before the prescribed time t after the transmission of each ultrasonic pulse, a gate circuit 7 opens by a constant time. If a receiver 5 has received the reflected wave when the time t elapse since the transmission of each ultrasonic wave pulse, that received reflected value is the wave reflected from the target, and a target pulse is supplied from a differential amplifier 9 to the part 10. Now when, for example, a human body passes between the antenna 4 and the target, the ultrasonic pulses transmitted at the time do not arrive at the target any longer, and no more target pulses are supplied to the part 10. Thereby, the presence or absence of the reflected waves by the target is detected and the intrusion is detected by the results of the discrimination thereof.
JP14392880A 1980-10-15 1980-10-15 Detector for intrusion Pending JPS5767869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14392880A JPS5767869A (en) 1980-10-15 1980-10-15 Detector for intrusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14392880A JPS5767869A (en) 1980-10-15 1980-10-15 Detector for intrusion

Publications (1)

Publication Number Publication Date
JPS5767869A true JPS5767869A (en) 1982-04-24

Family

ID=15350341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14392880A Pending JPS5767869A (en) 1980-10-15 1980-10-15 Detector for intrusion

Country Status (1)

Country Link
JP (1) JPS5767869A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6131983A (en) * 1984-07-25 1986-02-14 Sogo Keibi Hoshiyou Kk Ultrasonic invader detecting system
JPS63159481U (en) * 1987-04-03 1988-10-19

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6131983A (en) * 1984-07-25 1986-02-14 Sogo Keibi Hoshiyou Kk Ultrasonic invader detecting system
JPS63159481U (en) * 1987-04-03 1988-10-19

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