PROCESS AND DEVICE FOR MONITORING THE OCCURRENCE OR SPREADING OF FRACTURES OR CRACKS IN MATERIALS, WORKPIECES, COMPONENT PARTS, STRUCTURES OR FLYING OBJECTS, IN PARTICULAR IN EARTHQUAKE-PRONE REGIONS OR MOVEMENT OF STRATA DURING TUNNELLING

摘要

a method and a device for monitoring the appearance of cracks, fractures, earthquakes and landslides are part of the fact that such events are associated with the occurrence of changes in the electric field.these changes are recorded by means of a field probe (1) which consists of metal probe elements (2, 3), which is a differential amplifier (5) whose output signal (69) is transmitted to an evaluation unit (10, 11).