Compensated Resistance Matrix Approach for Readout of the 2-D Resistive Sensor Array for High-Temperature Measurement

A 2-D resistive sensor array (RSA), which has the advantages of high stability and easy implementation, is widely used in the measurement of surface parameters. Nevertheless, at present, resistance arrays are usually used to measure surface parameters under normal temperature conditions. But there is a lack of research in high-temperature applications that urgently require surface parameter measurement of components. In a high-temperature environment, wires made of high-temperature-resistant materials will lead to an increase in wire resistance, resulting in measurement errors. Through the simulation, we verified that the small wire resistance will cause a huge error. There will be a maximum measurement error of 40% in the 10times10 array at 500 °C, and the error increases with increasing temperature and array size. To solve the measurement error caused by the wire resistance, we derived the formula of the circuit model and proposed the compensated resistance matrix approach (CRMA) for the accurate measurement of the 2-D RSA at high temperatures. The CRMA can control the mean square error of the measurement to 10-7 and achieve accurate measurement of the temperature field. Furthermore, an experimental platform for verifying the CRMA was built, and the verification experiments were carried out. The results showed that the measurement error of this method can be controlled below 2% under high-temperature conditions, and it can be used in accurate measurements that require low complexity and are used in high-temperature environments.