Title :
A self-validating differential-pressure flow sensor [using wavelet transforms]
Author :
Zhang, Jian Qiu ; Yan, Yong
Author_Institution :
Adv. Instrum. & Control Res. Centre, Univ. of Greenwich, Kent, UK
Abstract :
The blockage of the sensing lines of a differential-pressure (DP) flow sensor has been found to be the main cause of malfunction of a flow measurement system in many industrial processes. A novel method based upon wavelet transforms for the self-validation of the DP flow sensor is presented. Unlike a conventional DP flow sensor that provides only measurements, a self-validating version of the sensor developed enables its measurements to be accompanied by a validity index. Namely, the accuracy of the measurement is reflected by the validating uncertainty whilst the normality of the measurement is indicated by normal/abnormal sensor operating status. Experimental results of a designed prototype sensor have verified the effectiveness of the approach
Keywords :
capacitive sensors; fault diagnosis; flowmeters; measurement uncertainty; signal processing; wavelet transforms; capacitance transducer; differential-pressure flow sensor; fault detection; flow measurement system; industrial processes; measurement accuracy; measurement normality; orifice plate; self-validating sensor; sensing lines blockage; sensor operating status; signal conditioning circuit; validating uncertainty; validity index; wavelet transforms; Control systems; Fluid flow measurement; Hardware; Instrumentation and measurement; Instruments; Mechanical sensors; Sensor systems; Temperature sensors; Thermal sensors; Wavelet transforms;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2001. IMTC 2001. Proceedings of the 18th IEEE
Conference_Location :
Budapest
Print_ISBN :
0-7803-6646-8
DOI :
10.1109/IMTC.2001.928271
