Minimizing the Zero-Flow Error in Transit-Time Ultrasonic Flow Meters

Conference paper (2018)

Authors

Douwe van Willigen Electronic Instrumentation -

Paul van Neer TNO,

J.M. Massaad Mouawad

M. Verweij , Erasmus MC

N. de Jong Erasmus MC,

M. Pertijs Electronic Instrumentation -

Research Group

Electronic Instrumentation () (TU Delft)

Resonance frequency Measurement uncertainty Impedance RLC circuits Transducers Impedance measurement Meters

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Published Date

2018

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

Transit-time ultrasonic flow meters are based on the fundamental idea that the flow is the only non-reciprocal effect between an upstream and downstream measurement. Non-identical transducers can be used in a reciprocal manner if the circuit is made reciprocal. In this paper we analyze the effect of driver- and readout electronics on the zero-flow error in transit-time ultrasonic flow meters by simulation and measurement. Using the frequency characteristic of two nonidentical transducers, the cause of the zero-flow error in nonreciprocal circuits is evaluated. Both simulation and measurement results show that the lowest zero-flow error can be obtained by using circuits that have an impedance significantly higher or lower than the impedance of the transducers.

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