Temperature measurement method and temperature measurement system based on platinum resistor temperature sensor

• Main Authors: SONG YUGANG, WU JIALONG, WANG CHAO, CHEN JIAPEI
• Format: Patent
• Language: Chinese; English
• Published: 18.04.2023
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; MEASURING; MEASURING QUANTITY OF HEAT; MEASURING TEMPERATURE; PHYSICS; TESTING; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR

The invention provides a temperature measurement method and system based on a platinum resistor temperature sensor, and the method comprises the steps: generating a variable-frequency square wave signal, outputting a modulation excitation current signal at a high-level stage of the square wave signal, exciting the platinum resistor temperature sensor through the modulation excitation current signal, and measuring the temperature of the platinum resistor temperature sensor. A digital voltage signal in a time domain is converted into a power signal in a frequency domain through an FFT algorithm, a direct-current component is extracted, a fundamental component of an excitation current signal is modulated, a resistance value of the platinum resistor temperature sensor is obtained according to the direct-current component and the fundamental component, and then a temperature value of a measured point is calculated. The variable-frequency square wave modulation current source is used for exciting the platinum resis