| 摘要 |
A method and an apparatus for guided-wave tomographic measurement or monitoring of wall thicknesses of the walls of pipes and similar structures are disclosed. The method is characterized in that use is made of transducers 405 (205, fig 1) preferably positioned in at least two groups of a plurality of transducers 405',405" arranged in a spaced apart pattern on the external surface of the structures, said transducers individually transmit ultrasound signal into the pipe wall, in that each said ultrasound signal propagates within the pipe wall from the transmitting transducer and is received at one or several receiving transducers, and said received ultrasound signal is converted to an electrical signal by the receiving transducers and recorded by the transceiver (20), and further characterized in that measurements are performed by using a further plurality of transducers 406 (506, fig 5) that are placed apart from the two groups of a plurality of transducers. There is also disclosed a method for guided-wave tomographic measurement or monitoring of wall thicknesses in the walls of pipes and similar structures producing a set of measurement data by using the apparatus according to the apparatus. |
