CAJ | 학술논문

针对热电偶传感器存在的输出热电势信号小、不便于远距离传输，需要进行冷端温度补偿、不便于使用，输出的是模拟信号、不便于实现数字式测量等问题，提出一种基于单片机的测量电路，该电路可对热电偶输出的信号进行测量，并能够自动进行冷端温度补偿，测量结果转换为RS232串行信号向外输出。热电偶传感器配备上该测量电路，便可实现所测温度的数字输出，具有较高的实用性。
침대열전우전감기존재적수출열전세신호소、불편우원거리전수，수요진행랭단온도보상、불편우사용，수출적시모의신호、불편우실현수자식측량등문제，제출일충기우단편궤적측량전로，해전로가대열전우수출적신호진행측량，병능구자동진행랭단온도보상，측량결과전환위RS232천행신호향외수출。열전우전감기배비상해측량전로，편가실현소측온도적수자수출，구유교고적실용성。
A conventional thermocouple has some disadvantages: its output signal is weak, making it difficult for a long distance signal transmission;it needs temperature compensation at cold junctions, making the application inconvenient;and its output signal is an analog signal, making it complex for doing a digital measurement. As to these problems, this paper introduced a measuring circuit based on a computer, which can directly measure the output signals of thermocouples and automatically make the cold-junction temperature compensation. The measuring re-sults from the circuit are turned into RS232 serial signals to output. The thermocouple equipped with the circuit will be able to output digital sig-nals corresponding to the measured temperature. So the design is of high practical value.