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Minimum Entropy Deconvolution of Guided Wave Signals in Pipe Inspection

It is difficult to achieve high resolution for guided wave signals used in pipe inspection. The main reasons include overlap of the reflected waves, diversity of the guided wave’s mode and so on. This paper presents a minimum entropy deconvolution algorithm to solve the problem caused by low resolution of the measured signals. Some experiments were carried out to validate the algorithm. The experimental set-up consists of two pipes, one excitor and two accelerometers. The excitor was used to generate the guided wave signals. Two accelerometers were attached to the pipe end and pipe wall respectively，and were used to measure the guided wave signals. Results show that good estimate of the reflection coefficient is obtained and the resolution of measured signals has been improved. As a result, the length of two pipe samples has been calculated with a reasonable accuracy and the position of the defect in experimental pipe has also been acertained. All of these show a new efficient way for guided wave signal processing in pipe inspection.