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来源:百度知道 编辑:UC知道 时间:2024/06/20 11:45:51
as the temperature difference between the two junctions varies, the magnitude of the voltage across the thermocouple pair also varies. the voltage thus provides an analog representation of the temperature difference . the other kind of signal is a digital signal. a digital signal is one that can take on values within two discrete ranges. such signals are used to represent on-off or yes-no information. an ordinary household thermostat delivers a digital signal to control the furnace. when the room temperature drops below a preset value , the thermostat switch closes turning on the furnace . once the room temperature rises high enough, the switch opens turning off the furnace . the current through the switch provides a digital representation variation : on equals " too cold "while off equals " not too cold ".

当两个连接点的温差发生变化时,热电偶对的电压也发生变化。因此,电压就可以作为温差的模拟量。另一种信号是数字信号。数字信号能在两种分离的范围内呈现出不同的值,并且通常被用作表现开关或是非信息。一台普通家用恒温器通过传递数字信号来控制暖气。当室温低于预设的温度时,恒温器开启暖气;一旦室温升高到足够的温度,恒温器就会关闭暖气。通过开关的电流提供了一个数字模拟变量,“开”相当于“太冷了”;“关”代表“不很冷了”。

根据两结点中不同的温度差,通过热电偶的电压值也会不同。我们可将此时的电压值视为温度差的表示。另一种表现方式是数字信号。该信号可以执行两个离散范围内的数值,通常用于代表离合或是非信息。一个普通的家用恒温器可以通过传达一个数字信号来控制炉温。当室内温度低于预设值时,该恒温器开关闭合,以启动暖炉。而当室内温度升到合适值时,开关抬起以关闭暖炉。电流通过开关产生数字值变动:启动暖炉等同于“过冷”,关闭暖炉等同于“温度适宜”。