煤炭中的含水量是个十分重要的指标，直接影响产品工艺和质量。因此设计一款含水量检测系统，根据测量物质不同，可以选择不同的模式，实现一键测量，并且可以通过人机交互界面实时绘制温度曲线，测量结束后可以通过热敏打印机将结果打印出来，方便科研人员记录实验结果。设计解决了恒流源易受温度干扰问题、PT100温度转换非线性等问题。该含水量检测系统加热部分是一个电阻炉，针对加热炉的滞后性和时变性，提出了一种新型控制方案，可在电阻炉数学模型不确定的情况下，通过被控温度的偏差和偏差的变化率的大小，选择不同的控制规则，使炉温快速达到设定温度。
The moisture content in coal is a
very important index which directly affects the process and quality of the
product. Therefore, to design a multi-purpose water measuring equipment,
according to different measuring materials, you can choose a different model to
achieve one key measurement, and the temperature curve can be plotted in real
time through the human-computer interaction interface; after the end of the
measurement the results can be printed out by thermal printer, to facilitate
the operator to record the results of the experiment. The design resolves the
problem that constant current source is easy to be disturbed by temperature, the
nonlinear temperature conversion of PT100, and other problems. The heating part
of the moisture measuring instrument is a resistance furnace. Aiming at the lag
and time variation of heating furnace, a new control scheme is proposed. In the
case of uncertain mathematical model of resistance furnace, different control
rules can be selected through the deviation of the controlled temperature and
the change rate of the deviation, so that the furnace temperature can reach the
set temperature quickly.
