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Verfahren und Vorrichtung zum Ueberwachen des Auftretens oder Ausbereitens von Bruechen oder Rissen in Materialien, Werkstuecken, Bauteilen, Bauwerken oder Himmelskoerpern, insbesondere in erdbebengefaehrdeten Gebieten oder bei Gebirgsbewegungen im Tunnelbau

Process and device for the monitoring of the occurrence or propagation of fractures or cracks in materials, workpieces, components, structures or celestial bodies, in particular in earthquake-hazard areas or rock movement in tunnel construction
 
: Lovse, H.; Senf, H.; Zimmermann, G.; Winkler, S.

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Frontpage ()

DE 1989-1608 U: 19890213
EP 1990-902616 AW: 19900211
DE 4004170 A1: 19900816
EP 457788 B1: 19940504
G01N0003
German
Patent, Electronic Publication
Fraunhofer EMI ()

Abstract
A process and device for monitoring the occurrence of cracks, fractures, earthquakes and movement of strata is based on the principle that events of this sort are associated with electrical field changes. The electrical field changes associated with the occurrence of events of this sort are recorded by a field probe (1) which has metallic probe elements (2, 3) which supply a differential amplifier (5) whose output signal (6) supplies an analyzer (10, 11).

: http://publica.fraunhofer.de/documents/PX-38584.html