Patent ID: 6112580
Filing Date: 2000-09-05
Classification: G01M

Abstract:
A pipeline with apparatus for status detection, in particular leak detection, comprising:an inner medium-carrying pipe (1) for the transportation of a medium, a heat-insulating layer (2), and an outer protective pipe (3),at least one sensor (4), which includes a sensor device (7) responsive to at least one of moisture level and temperature level, and an induction coil (5) arranged in the region of the heat-insulating layer (2);the sensor device (7) and the induction coil (5) form a resonating circuit whose resonance properties depend on the state of the sensor device (7) as a result of the conditions (moisture, temperature) prevailing in the heat-insulating layer; andan interrogation device (20) which includes a frequency generator (26), an exciter coil (25), and an evaluation device (24) and can be brought into a position near the sensor (4) to feed electromagnetic radiation thereto, the resonance properties of the sensor resonating circuit being detected.