Global patent index - EP 1066510 A1

EP 1066510 A1 2001-01-10 - AUTOMATIC ERROR DETECTION METHOD USED DURING CRACK INSPECTION ACCORDING TO THE DYE PENETRATION METHOD

Title (en)

AUTOMATIC ERROR DETECTION METHOD USED DURING CRACK INSPECTION ACCORDING TO THE DYE PENETRATION METHOD

Title (de)

VERFAHREN ZUR AUTOMATISCHEN FEHLERERKENNUNG BEI DER RISSPRÜFUNG NACH DEM FARBEINDRINGVERFAHREN

Title (fr)

PROCEDE DE RECONNAISSANCE AUTOMATIQUE DE DEFAUTS LORS DE LA RECHERCHE DE FISSURES SELON LE PROCEDE D'EXAMEN PAR PENETRATION DE COLORANTS

Publication

EP 1066510 A1 (DE)

Application

EP 00906158 A

Priority

  • DE 0000183 W
  • DE 19902525 A

Abstract (en)

[origin: DE19902525A1] The invention relates to an automatic fault detection method used during crack inspection according to the dye penetration method. According to the inventive method, workpieces are treated with penetrating agents containing dyes during which the dyes concentrate at locations with surface faults and, after a predetermined developing duration, are recorded by at least one image recording unit. In addition, the recorded images are assessed for faults in an image processing unit by scanning and identifying areas which have a concentration of dye, and corresponding signals are output. The method comprises the following steps: Recording images of the same workpiece (10) at at least two times t1, t2 after the workpiece has been treated with penetrating agents and optionally developing, upon receipt, at least two recorded images A1, A2; comparing the recorded images A1, A2 and using the evaluation logic of the signal processing unit (22) to evaluate the comparison; outputting signals via the evaluation logic which, in corresponding areas on the recorded images, depict the changes in the concentration of penetration agent over the time period DELTA t1, t2, said changes being greater than a change threshold value for a reference time difference; and evaluating the measured workpiece-related parameters in order to produce assessment values of the cracking, such as a good/bad statement, or to conduct a fault value assessment according to a predetermined value interval or in the predetermined superficial area.

IPC 1-7 (main, further and additional classification)

G01N 21/91

IPC 8 full level (invention and additional information)

G01N 21/91 (2006.01)

CPC (invention and additional information)

G01N 21/91 (2013.01)

Citation (search report)

See references of WO 0043758A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

DE 19902525 A1 20000817; DE 19902525 C2 20010322; CN 1187603 C 20050202; CN 1293758 A 20010502; EP 1066510 A1 20010110; WO 0043758 A1 20000727

INPADOC legal status

2005-11-09 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20050317

2001-03-07 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20001229

2001-01-10 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE