JPS5583869A - Antenna unit of transmitter for search of vacant duct buried in earth - Google Patents

Antenna unit of transmitter for search of vacant duct buried in earth

Info

Publication number
JPS5583869A
JPS5583869A JP16031978A JP16031978A JPS5583869A JP S5583869 A JPS5583869 A JP S5583869A JP 16031978 A JP16031978 A JP 16031978A JP 16031978 A JP16031978 A JP 16031978A JP S5583869 A JPS5583869 A JP S5583869A
Authority
JP
Japan
Prior art keywords
magnetic field
main body
transmitter
buried
antenna
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
JP16031978A
Other languages
Japanese (ja)
Inventor
Eiichi Kuwabara
Sadaichi Kojima
Toshiharu Tsushima
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP16031978A priority Critical patent/JPS5583869A/en
Publication of JPS5583869A publication Critical patent/JPS5583869A/en
Pending legal-status Critical Current

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  • Geophysics And Detection Of Objects (AREA)

Abstract

PURPOSE: To make it possible to measure the buried position and the buried depth of only a vacant duct from the position on the earth by controlling a generated magnetic field so that the magnetic field may indicate the directional pattern of twin of truncated-cone type characteristic more than loop antenna theory and avoiding interlinkage of the magnetic field for other buried parallel ducts.
CONSTITUTION: Main body 5-1 is made in plastic and is formed into one body together with slide wing bodies 5-2, and wing bodies 5-2 are provided radially from main body 5-1 at a right angle to one another. Further, guide end part 5-4 to insert antenna unit 5 into a duct is provided. Connection part 5-3 for driving material connection is provided at the back end of main body 5-1, and main body 5-1 is provided with antenna part 6 where external circuit matching circuit (impedance matching coil) L1 and circuit L2 tuning to the transmission signals of a transmitter are wound around antenna core 3a independently. Thus, magnetic field H2 generated by unit 5 indicates the directional pattern of twin of truncated-cone type characteristic more than loop antenna theory when high frequency signals modulated by an audible frequency are sent from the transmitter. Consequently, a desired purpose is achieved.
COPYRIGHT: (C)1980,JPO&Japio
JP16031978A 1978-12-20 1978-12-20 Antenna unit of transmitter for search of vacant duct buried in earth Pending JPS5583869A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16031978A JPS5583869A (en) 1978-12-20 1978-12-20 Antenna unit of transmitter for search of vacant duct buried in earth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16031978A JPS5583869A (en) 1978-12-20 1978-12-20 Antenna unit of transmitter for search of vacant duct buried in earth

Publications (1)

Publication Number Publication Date
JPS5583869A true JPS5583869A (en) 1980-06-24

Family

ID=15712374

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16031978A Pending JPS5583869A (en) 1978-12-20 1978-12-20 Antenna unit of transmitter for search of vacant duct buried in earth

Country Status (1)

Country Link
JP (1) JPS5583869A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6373688U (en) * 1986-11-04 1988-05-17
JPH01280286A (en) * 1988-05-02 1989-11-10 Kyokuto Kaihatsu Kogyo Co Ltd Buried body detecting method
JPH06109862A (en) * 1992-09-30 1994-04-22 Tokyo Gas Co Ltd Detection method of target point in buried pipe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6373688U (en) * 1986-11-04 1988-05-17
JPH01280286A (en) * 1988-05-02 1989-11-10 Kyokuto Kaihatsu Kogyo Co Ltd Buried body detecting method
JPH06109862A (en) * 1992-09-30 1994-04-22 Tokyo Gas Co Ltd Detection method of target point in buried pipe

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