Integrated Smart Sensor Calibration

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• 作者：Gert van der Horn and Johan H. Huijsing
• 关键词：calibration ; smart sensors ; linearization ; analog signal processing ; microsystems ; microcontroller ; based sensor systems
• 刊名：Analog Integrated Circuits and Signal Processing
• 出版年：1997
• 出版时间：1997
• 年：1997
• 卷：14
• 期：3
• 页码：207-222
• 全文大小：1.27 MB

文摘

In many applications electronic sensors are used toimprove performance and reliability of measurement systems. Suchsensors should provide a correct transfer from the physical signalto be measured to the electrical output signal. One importantstep to achieve this, is to calibrate each sensor by applyingdifferent reference input signals and adjusting the sensor transferaccordingly. Besides expensive reference equipment the calibrationprocess takes much time and attention per individual sensor,which means a considerable increase in sensor production costs.By including at the sensor or sensor interface chip a programmablecalibration facility the calibration of such smart sensors caneasily be automated and can be executed for a batch of sensorsat a time, thus minimizing the calibration time and costs. Thispaper presents a calibration method and options for integrationin the smart sensor concept, in hardware as well as in software.An advantage of the proposed method is that it does not needa large matrix of calibration data, which needs to be storedin a look-up table or converted into a correction formula, butinstead it uses a step-by-step approach to correct the sensortransfer at each calibration measurement until the error is sufficientlysmall.