太陽能熱水器溫度采集系統與實驗研究

　　介紹了太陽能熱水器溫度采集系統的硬件、軟件設計和實驗研究。鉑電阻的阻值隨溫度的變化轉換成電壓的變化，調理電路對電壓信號進行放大、變換，輸出0～5 V的標準信號， 送下位機后進行A/D轉換，再通過串行通信上傳給上位機進行存儲、顯示。系統采用對分查找的算法， 得到不同溫度區間上的標度變換算法。鉑電阻溫度的對比實驗結果表明該系統的測量精度優于±1 ℃，系統工作穩定、可靠。

　　Abstract:

　　The hardware and software design of solar water heater temperature acquisition system was introduced. The change of the platinum resistance with temperature is converted to voltage’s variety. Conditioning circuit carries out the magnification and conversion of the voltage signal. The output standard signal from 0 to 5 V is transported to lower computer for A/D converter. The converted digital data are sent to upper computer through serial communication and are stored and displayed in it. The system of sub-search algorithm used to obtain different temperature ranges on the scale conversion algorithm. The comparative of platinum resistance temperature showes that the measuring accuracy of this system is better than ±1 ℃， this system is credible and stable.