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1 引 言 在“混合法测定金属块比热”实验中,为减小由于与环境进行热交换而产生的测量误差,我们用图解法求解混合前与混合后的温度。这样测量整个过程中的水温的变化就成了实验的关键,但是由于混合中水温的变化十分剧烈,所以要求在测量温度时的时间间隔很短,这样就给实验操作者带来了很大的困难,有的实验者甚至不能完成混合过程中水温变化的测量。为此我们利用热敏电阻制作温度传感器,利用温度传感器把水温变化的热信号转化为电信号,而后用微机定时地采集测得温度随时间变化曲线,进而求出混合前与混合后温度的值。经过改进的装置使实验的可操作性将大大提高收到很好的效果。
1 Introduction In the “mixed method of determining the specific heat of metal block” experiment, in order to reduce the measurement error due to the heat exchange with the environment, we use graphical method to solve the temperature before and after mixing. This measurement of water temperature throughout the course of the change has become the key to the experiment, but due to the mixing of water temperature changes are very intense, so the time required to measure the temperature is very short, so to give laboratory operators a lot of Difficult, and some experimenters can not even complete the measurement of water temperature changes during the mixing process. To this end, we use the thermistor temperature sensor, the use of temperature sensors to change the water temperature signal into electrical signals, and then use the computer to regularly measure the measured temperature with time curve, and then find the value of the temperature before and after mixing . The improved device makes the experiment operability will greatly improve the received good results.