Title :
A smart and accurate interface for resistive sensors
Author :
Li, Xiujun ; Meijer, Gerard C M
Author_Institution :
Fac. of Inf. Technol. & Syst., Delft Univ. of Technol., Netherlands
fDate :
12/1/2001 12:00:00 AM
Abstract :
This paper presents a smart and accurate interface for resistive sensors based on the use of a relaxation oscillator. To obtain high accuracy, good long-term stability and a reduction of the effects of interference and parasitic elements, some classical and new measurement techniques have been applied in the novel sensor interface. Moreover, all multiplicative and additive errors, and the common-mode effect of the interface are eliminated, using a multiple-signal calibration technique. A prototype has been built and was tested. Experimental results show that the interface is able to measure a resistance of 0 to 400 Ω, with a resolution of 7 mΩ and an accuracy of 11 mΩ. The measurement time is about 100 ms
Keywords :
calibration; electric resistance measurement; electric sensing devices; intelligent sensors; measurement errors; relaxation oscillators; 0 to 400 ohm; 100 ms; additive error; common-mode effect; multiple-signal calibration; multiplicative error; relaxation oscillator; resistance measurement; resistive sensor; smart interface; Calibration; Electrical resistance measurement; Intelligent sensors; Interference; Measurement techniques; Oscillators; Prototypes; Stability; Testing; Time measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
