Adaptive calibration of a capacitance tomography system for imaging water droplet distribution

Yang, W Q and Chondronasios, A and Nattrass, S and Nguyen, V T and Betting, M and Ismail, Idris and McCann, H (2004) Adaptive calibration of a capacitance tomography system for imaging water droplet distribution. Flow Measurement and Instrumentation, 15. pp. 249-258.

[thumbnail of FMI_15_2004_Adaptive-new.pdf] PDF
FMI_15_2004_Adaptive-new.pdf - Published Version
Restricted to Registered users only

Download (486kB)


A highly sensitive electrical capacitance tomography (ECT) system based on an HP4284 impedance analyser has been developed and used to quantify low concentration multi-phase flows in wet gas separation processes. The system hardware provides high accuracy (0.05%) and high resolution (10−17 F). The sensor was calibrated in an environmental chamber with solid samples of known permittivity over ranges of temperature and humidity. Adaptive calibration and adjacent electrode pair correction techniques were applied to image very low concentration profiles. This paper describes the techniques used and presents the experimental results obtained from a test flow rig called Twister, which has been designed to separate liquid droplets from wet gas streams. The test results over a range of operating conditions (20–95% humidity) demonstrate that the ECT system is capable of reconstructing clear images of the droplet distribution inside Twister. Changes as small as 1 gWater/kgAir in the form of liquid droplets were detectable. It has also been shown that the concentration of the condensable phase can be estimated quantitatively within 20% in comparison with the reference measurements.

Item Type: Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments / MOR / COE: Departments > Electrical & Electronic Engineering
Depositing User: Ir Dr Idris Ismail
Date Deposited: 02 Aug 2011 04:04
Last Modified: 19 Jan 2017 08:27

Actions (login required)

View Item
View Item