Abstract
A frequently encountered measurement configuration for ultrasonic inspection of steel components consists of a single element transducer insonifìing a specimen of limited depth in pulse echo mode.
In this case, the gain in signal-to-noise ratio achievable by pulsecompression technique is limited by the fact, that the duration of the transmitted chirp signals must not be longer than twice the time-of-flight from the tramitting element to the imaging area. This is why the transducer is unable to transmit and receive simultaneously.
A new class of splitted chirp signals allows to overcome this limitation. A long chirp signal is divided into several parts, each of twice the length of the time-of-flight. These parts are transmitted with time delays determined by the depth of the imaging area.
The received echo signals can be pulse-compressed by a single filtering operation. Therefore a considerable gain in data aquisition speed, compared to averaging methods, can be achieved.
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© 1993 Springer Science+Business Media New York
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Pollakowski, M., Ermert, H., von Bernus, L. (1993). Pulsecompression in Pulse-Echo-Mode with Splitted Chirp Signals. In: Wei, Y., Gu, B. (eds) Acoustical Imaging. Acoustical Imaging, vol 20. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2958-3_30
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DOI: https://doi.org/10.1007/978-1-4615-2958-3_30
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