B5.4 - Signal Processing for Single Transducer Distance Measurement Applications to Reduce the Blind Zone

Event
AMA Conferences 2013
2013-05-14 - 2013-05-16
Nürnberg
Band
Proceedings SENSOR 2013
Chapter
B5 - Measuring Technology
Author(s)
A. Schröder, B. Henning - University of Paderborn (Germany)
Pages
279 - 284
DOI
10.5162/sensor2013/B5.4
ISBN
978-3-9813484-3-9
Price
free

Abstract

Piezoelectric air ultrasound transducers typically have a small bandwidth. So they cannot be used to transmit short signals. This leads to a blind zone which prevents measuring short distances in single transducer applications, because normally receiving is not possible until transmitting is finished. The blind zone is significantly increased if coded signals are used which is necessary to identify different sensors in a multi sensor environment to reduce crosstalk. One solution is to implement a simultaneous transmitting and receiving operation by model based suppression of the transmitted signal. It is possible to measure distances down to 50 mm using fixed signal processing. To measure smaller distances the signal processing has to be modified. This contribution shows an extended signal processing for further reduction of the blind zone.

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