Abstract
A method was developed for enhancing the signal-to-clutter ratio in ultrasonic testing through the use of the Wigner transform. The Wigner distribution is a two-dimensional function showing the distribution of energy as a function of time and frequency. It can be interpreted as giving bandpass filtered versions of the signal energy at each discrete point in time. These timeenergy sequences may be combined using split-spectrum processing methods to increase the flaw-to-grain echo ratio. A specimen of centrifugally cast stainless steel pipe used in power reactors was inspected using the pulse-echo method. The received signal was split into a number of decorrelated time signals which resulted directly from the Wigner transform. These signals were then averaged to yield the enhanced signal. Preliminary results are graphed and evaluated.
| Original language | English |
|---|---|
| Title of host publication | Review of Progress in Quantitative Nondestructive Evaluation |
| Pages | 805-812 |
| Number of pages | 8 |
| Volume | 7 A |
| State | Published - 1988 |
| Externally published | Yes |