IMPROVING ACCURACY AND LINEARITY OF LOW-COST FLOWMETERS |
|---|
| M. Dias Pereira, O. Postolache, P. Silva Girão |
- Abstract:
- Two of the most important static transducer characteristics, in any measurement system, are linearity and accuracy. In the present paper the calibration and linearization of a low-cost orifice flow meter is considered. Accuracy improvements are based on calibration coefficients that are evaluated with the measurements obtained from a reference flow meter. Linearity improvement is based on a non-linear A/D conversion whose transfer characteristic is the inverse of the transducer’s characteristic. The linearity can be strongly improved using a non-linear A/D conversion performed by a low-cost ADC, using only single-bit input and output ports. The proposed method, already described by the authors in previous papers, is applied to an orifice based flow meter, simplifying the typical conditioning circuit that requires an additional square root extractor circuit module. The paper includes simulation and experimental results that validate theoretical expectations.
- Download:
- IMEKO-TC4-2008-133.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- Exploring New Frontiers of Instrumentation and Methods for Electrical and Electronic Measurements
- Title:
- XVIth IMEKO TC4 International Symposium on Electrical Measurements and Instrumentation (together with 13th IMEKO TC4 Workshop on ADC Modelling and Testing)
- Place:
- Florence, ITALY
- Time:
- 22 September 2008 - 24 September 2008