Title :
Improved vortex flow meter using pre-filter
Author :
Akresh, M. ; Reindl, L. ; Walker, W.D.
Author_Institution :
Inst. for Microsyst. Technol. (IMTEK), Univ. of Freiburg, Freiburg
Abstract :
The frequency of the vortex formation in a flow meter can be measured using a piezoelectric sensor. The piezoelectric sensor produces a raw signal, where the average frequency indicates volumetric flow rate. This sensor signal contains more information than just the frequency of vortex. The objective of this research is to optimize a typical flow meter with a measurement range of 0.5-4.5 l/min and also output a signal outside of this measuring range. A vortex-signal is taken directly from a piezoelectric sensor with a flow rate of greater than 4.5 l/min to investigate the sensors capability in sensing a vortex signal in a turbulence range, and to identify the various noises which distort the vortex signal. Based on experimental measurements, an analog pre-filter circuit system has been designed.
Keywords :
flowmeters; piezoelectric transducers; vortices; analog prefilter circuit system; piezoelectric sensor; vortex flow meter; vortex formation; vortex-signal; Circuit noise; Circuits and systems; Distortion measurement; Fluid flow measurement; Frequency measurement; Mechanical sensors; Sensor phenomena and characterization; Sensor systems; Signal processing; Time measurement; piezoelectric sensor; signal processing; vortex flow meter;
Conference_Titel :
Signals, Circuits and Systems, 2008. SCS 2008. 2nd International Conference on
Conference_Location :
Monastir
Print_ISBN :
978-1-4244-2627-0
Electronic_ISBN :
978-1-4244-2628-7
DOI :
10.1109/ICSCS.2008.4746877
