Multi-layer Level Measurement Using Adaptive Filtering

• Published in: 2005 IEEE Instrumentationand Measurement Technology Conference Proceedings Vol. 1; pp. 732 - 736
• Main Authors: de Oliveira, J.I.S., Catunda, S.Y.C., Barros, A.K., Naviner, J.-F.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 2005
• Subjects: Adaptive Filtering; Adaptive filters; Digital Signal Processing; Displacement measurement; Echo Detection; Level measurement; Liquids; Noise measurement; Pulse measurements; Sensor phenomena and characterization; Time measurement; Time-of- Flight Measurement; Ultrasonic Signals; Ultrasonic transducers; Ultrasonic variables measurement
• DOI: 10.1109/IMTC.2005.1604214
• ISBN: 9780780388796; 0780388798
• ISSN: 1091-5281

In several applications the measurement of the levels of multi-layer liquids cannot be carried out using sensors in direct contact with the substances. In these cases, one alternative is to use contactless ultrasonic transducers and measure the time-of-flight of the echoes produced by the reflection of a known signal by the different layers. We propose a measurement system for using with ultrasonic transducers that is composed by an adaptive filter for noise cancellation and cross-correlation measurement to identify the time instants of the received echoes. Simulations results are presented for the measurement of the level of two-layer liquids and show the efficiency of the proposed structure