Experiment study on the performance of temperature calibration methods

• Main Author: Ngai, Xuan Dong
• Other Authors: Cai Wenjian
• Format: Final Year Project
• Language: English
• Published: 2018
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/74769
• Institution: Nanyang Technological University

Different methods of calibration were experimented for Negative Temperature Coefficient thermistor. The different methods were beta formula, non-linear least square, inverse calibration and QR decomposition. To carry the experiment, a reference thermometer was used together with a thermistor to record the corresponding temperature and resistance. A digital multimeter was used to measure the resistance of the thermistor. They were placed in a thermo-flask with water so that the data points can be collected at different temperature, forming a non-linear relationship between temperature and resistance. The errors were compared on MATLAB and the method with the least errors were converted to C programming and downloaded to a micro controller for verification.