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.