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New design ideas for TDR-based liquid level detectors

Conference paper
Authors Lars Bengtsson
Published in I2MTC 2017 - 2017 IEEE International Instrumentation and Measurement Technology Conference. 22-25 May 2017. Turin, Italy. Proceedings
ISBN 978-150903596-0
ISSN 1091-5281
Publisher IEEE
Publication year 2017
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1109/I2MTC.2017.79698...
Keywords TDR, liquid level detector, nano-second pulse generator, TDC, embedded system
Subject categories Signal Processing, Other Electrical Engineering, Electronic Engineering, Information Engineering, Electronic measurement and instrumentation, Embedded Systems, Accelerator Physics and Instrumentation


This work suggests some new solutions to TDR-based liquid level detectors. A 3D-printed waveguide cylinder has been designed in order to increase the sensitivity of the level measurement. By wrapping the probing waveguide-pair around a cylinder, an inclination angle ϕ is introduced which increases the time-of-flight by a factor of 1/sinϕ and hence the level resolution is increased (by the same factor). This work also illustrates how nanosecond pulses (for TDR systems) can be generated by applying a technique usually found in FIMs (Field Ion Microscopes). A time resolution of 2 ns/mm (of liquid level) is reported and a generic nanosecond pulse generator isdemonstrated.

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