JPS5750620A - Electric noise remover - Google Patents

Electric noise remover

Info

Publication number
JPS5750620A
JPS5750620A JP12593780A JP12593780A JPS5750620A JP S5750620 A JPS5750620 A JP S5750620A JP 12593780 A JP12593780 A JP 12593780A JP 12593780 A JP12593780 A JP 12593780A JP S5750620 A JPS5750620 A JP S5750620A
Authority
JP
Japan
Prior art keywords
electric noise
comparators
outputs
circuit
output
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
JP12593780A
Other languages
Japanese (ja)
Inventor
Kimio Yamada
Yoshihiro Michiguchi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12593780A priority Critical patent/JPS5750620A/en
Publication of JPS5750620A publication Critical patent/JPS5750620A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

PURPOSE:To prevent the emission of a false alarm by removing electric noise by making use of the multichromaticity of the frequency spectra of the acoustic signal by collision sound and the monochromaticity of the electric noise, in a loop parts detector used in a nuclear reactor. CONSTITUTION:The signal from an acceleration detector is amplified, and is inputted to BPFs 4, 6 of which the respective frequency components are 1kHz and 5kHz. The outputs of the BPFs 4, 6 are supplied via detecting circuits 5, 7 for obtaining envelope waveforms to comparators 8, 9 and a divider 10 respectively. The outputs of the comparators 8, 9 are passed to an OR circuit 12, by which the output is obtained in correspondence to either collision sound or electric noise is detected. A comparator 11 discriminates the set range of the output from the divider 10 and provides the output as colliding sound. The outputs of the comparators 11 and the circuit 12 are passed through an AND circuit 13, by which only the signal by the collision sound is detected.
JP12593780A 1980-09-12 1980-09-12 Electric noise remover Pending JPS5750620A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12593780A JPS5750620A (en) 1980-09-12 1980-09-12 Electric noise remover

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12593780A JPS5750620A (en) 1980-09-12 1980-09-12 Electric noise remover

Publications (1)

Publication Number Publication Date
JPS5750620A true JPS5750620A (en) 1982-03-25

Family

ID=14922651

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12593780A Pending JPS5750620A (en) 1980-09-12 1980-09-12 Electric noise remover

Country Status (1)

Country Link
JP (1) JPS5750620A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60104208A (en) * 1983-11-11 1985-06-08 Nippon Atom Ind Group Co Ltd Shape discriminating method of solid body in flow path
JPS6131627U (en) * 1984-07-30 1986-02-26 日東精工株式会社 industrial robot
JPS6341429U (en) * 1986-09-02 1988-03-18
JPS6376426U (en) * 1986-11-07 1988-05-20

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60104208A (en) * 1983-11-11 1985-06-08 Nippon Atom Ind Group Co Ltd Shape discriminating method of solid body in flow path
JPH0326766B2 (en) * 1983-11-11 1991-04-11 Tokyo Shibaura Electric Co
JPS6131627U (en) * 1984-07-30 1986-02-26 日東精工株式会社 industrial robot
JPH0123710Y2 (en) * 1984-07-30 1989-07-20
JPS6341429U (en) * 1986-09-02 1988-03-18
JPH0432187Y2 (en) * 1986-09-02 1992-08-03
JPS6376426U (en) * 1986-11-07 1988-05-20

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