中圖分類號： TP29
文獻標識碼： A
DOI： 10.19358/j.issn.2096-5133.2021.04.010
引用格式： 李要中. 自動氣象溫濕度傳感器采集電路設計與實現[J].信息技術與網絡安全，2021，40(4)：64-69.

Design and implementation of acquisition circuit for automatic meteorological temperature and humidity sensor

Abstract： In order to meet the needs of the development of civil aviation meteorological automation, an automatic meteorological temperature and humidity sensor acquisition circuit is designed, which can achieve high precision acquisition of temperature and humidity elements around the runway of civil airport. The hardware circuit of the system is designed with modular structure, and the principle of temperature and humidity acquisition is analyzed. The temperature is measured by 4-wire PT100 platinum resistance. The voltage corresponding to temperature is generated by constant current source driving. Then the resistance value Rpt100 of temperature sensor is calculated by AD7792. The output type of humidity signal is 0～1 V DC voltage. The second channel of AD7792 and the reference voltage of 1.17 V on-chip are used to collect the sample value of ADSample2. The voltage value Vrh(unit：mV) corresponding to humidity is calculated, and Vrh is equal to the humidity sampling value in value. Experimental results show that the acquisition circuit can complete the acquisition of temperature and humidity signals.

Key words : meteorological elements；temperature and humidity；sensor；signal acquisition