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JPH01169348A - Cracking detector - Google Patents

Cracking detector

Info

Publication number
JPH01169348A
JPH01169348A JP32872187A JP32872187A JPH01169348A JP H01169348 A JPH01169348 A JP H01169348A JP 32872187 A JP32872187 A JP 32872187A JP 32872187 A JP32872187 A JP 32872187A JP H01169348 A JPH01169348 A JP H01169348A
Authority
JP
Japan
Prior art keywords
cracking
terminals
fine
potential difference
energization
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
JP32872187A
Inventor
Yasushi Sato
Original Assignee
Babcock Hitachi Kk
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 Babcock Hitachi Kk filed Critical Babcock Hitachi Kk
Priority to JP32872187A priority Critical patent/JPH01169348A/en
Publication of JPH01169348A publication Critical patent/JPH01169348A/en
Application status is Pending legal-status Critical

Links

Abstract

PURPOSE: To judge the presence of cracking, by measuring potential differences in two directions orthogonal to each other at the same point on the surface of a member to compare both voltage differences.
CONSTITUTION: A probe 4 is equipped with two sets of terminals (feed terminals 7 and 7' and detection terminals 8 and 8'), four per set. The terminals 7 and 7' and 8 and 8' are connected to a constant current device 2 and a fine voltmeter 1 respectively through a switching circuit 3. With such an arrangement, first, a potential difference (V) is measured between the terminals 8 and 8 with energization between the terminals 7 and 7. Then, a potential difference (V') is measured between the 8' and 8' with energization between the terminals 7' and 7'. Normally when a fine cracking is generated in a member, current detours around the cracking so that the potential difference increases as compared with a case having no cracking. Thus, when there is no cracking, V≈V' and when there is any cracking, V>V' or V<V'. This enables detection of the presence of a fine cracking.
COPYRIGHT: (C)1989,JPO&Japio
JP32872187A 1987-12-25 1987-12-25 Cracking detector Pending JPH01169348A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32872187A JPH01169348A (en) 1987-12-25 1987-12-25 Cracking detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32872187A JPH01169348A (en) 1987-12-25 1987-12-25 Cracking detector

Publications (1)

Publication Number Publication Date
JPH01169348A true JPH01169348A (en) 1989-07-04

Family

ID=18213437

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32872187A Pending JPH01169348A (en) 1987-12-25 1987-12-25 Cracking detector

Country Status (1)

Country Link
JP (1) JPH01169348A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5961225A (en) * 1992-10-06 1999-10-05 Seiko Epson Corporation Tape printing device and tape cartridge used therein
US6113292A (en) * 1994-12-02 2000-09-05 Seiko Epson Corporation Printer head release mechanism
JP2009028977A (en) * 2007-07-26 2009-02-12 Brother Ind Ltd Tape printing apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5961225A (en) * 1992-10-06 1999-10-05 Seiko Epson Corporation Tape printing device and tape cartridge used therein
US5997194A (en) * 1992-10-06 1999-12-07 Seiko Epson Corporation Tape printing device and tape cartridge used therein
US6012860A (en) * 1992-10-06 2000-01-11 Seiko Epson Corporation Tape printing device and tape cartridge used therein
US6106171A (en) * 1992-10-06 2000-08-22 Seiko Epson Corporation Tape printing device and cartridge used therein
US6149325A (en) * 1992-10-06 2000-11-21 Seiko Epson Corporation Tape printing device and tape cartridge used therein
US6113292A (en) * 1994-12-02 2000-09-05 Seiko Epson Corporation Printer head release mechanism
JP2009028977A (en) * 2007-07-26 2009-02-12 Brother Ind Ltd Tape printing apparatus

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