When estimating the impulse response of a system, pulse compression provides a valuable tool to overcome limitations due to noisy measurement environment conditions. These conditions occur in many contexts, among which the nondestructive testing is of particular interest in the industrial field. In this case, pulse compression is quite often implemented through frequency-modulated chirp signals applied to sensors of various types, including ultrasound, Eddy Current and thermographic sensors. The use of Pulse Compression technology provides a considerable advantage from the point of view of reducing the effects of measurement noise: however, its direct application implies the introduction of side-lobes that accompany the desired response. A reduction of these side-lobes can be obtained through appropriate windowing techniques: in this paper, a windowing technique based on the Reactance Transformation, recently proposed by the authors, is compared with the windowing techniques most frequently used in NDT.

The Reactance Transformation for Near Sidelobes Reduction: A Comparison of Windowing Techniques

Laureti S.;Ricci M.
2018

Abstract

When estimating the impulse response of a system, pulse compression provides a valuable tool to overcome limitations due to noisy measurement environment conditions. These conditions occur in many contexts, among which the nondestructive testing is of particular interest in the industrial field. In this case, pulse compression is quite often implemented through frequency-modulated chirp signals applied to sensors of various types, including ultrasound, Eddy Current and thermographic sensors. The use of Pulse Compression technology provides a considerable advantage from the point of view of reducing the effects of measurement noise: however, its direct application implies the introduction of side-lobes that accompany the desired response. A reduction of these side-lobes can be obtained through appropriate windowing techniques: in this paper, a windowing technique based on the Reactance Transformation, recently proposed by the authors, is compared with the windowing techniques most frequently used in NDT.
978-1-5386-5153-7
NDT
Near Sidelobes Reduction
Pulse Compression
Windowing
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/307389
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