大学物理实验报告英文版--温度传感器.doc

.Physical Lab Report :Temperature SensorsWriter: No: This time in the lab, I come to do something about temperature sensors. Before the experiment, I know that temperature sensors are very widely used lab equipment. From the guide, I can find their outputs changes as a function of temperature. The most commonly used ones in the lab are Platinum resistors and semiconductor thermocouples. In this experiment, I will describe the working principle of Platinum thermo-resistors, Semi-conductor thermo-resistor, and PN diode temperature sensor, and make measurements with them in the lab. At the beginning, I use the ice water to get the reference point to zero degree is 2 degree. So, when I deal with the data, I have changed the temperature into correct ones already.1. Semi-conductor thermo-resistorWithin range, the resistanc-temperature relation isIf we calibrate the resistance at a temperature T0 to be R0, we can rewrite this relation into T/C4548505355586164707378808284868890939699102105108111113115118R/4000370234733106286825442303210117441569134312821212114610891018967896838773724668624586561538505After I change the unit of temperature into K, I use computer to make a linear fit and get a graph as follows: The slope of the line is equal to 1555.6, it means B=1555.6 K.which is a little bit smaller than the reference.2. Platinum thermo-resistorsA platinum resistor has a temperature-resistance relation ofT/C27303336394245485154576063666972757883889398U/V0.1150.11830.12120.12350.1260.12830.13030.13210.13410.13620.1380.13970.14130.1430.14460.14650.14790.14940.15160.15410.15620.1583T/C14118520-2-4-6-7-8U/V0.10640.10570.10490.10440.10360.1030.10240.10180.10120.10080.1003From the graph ,I get the coefficient of x2 is B=2.8*10-7 oC-,the coefficient of x is A=6*10-4 C3. PN diode temperature sensorT/C353842454751535557596164669899101103U/V0.470.4620.450.44140.43660.42460.42010.41380.40750.40170.39580.38840.38350.29610.29290.28840.283T/C6972747678808385878890929496105106110U/V0.37520.36650.36060.35530.35010.34490.33860.33180.32640.32280.31720.31230.30630.30190.27710.27460.2634T/C1412975320-1-2-3-4-5U/V0.51220.51640.52210.52650.530.53340.53510.53870.54080.54250.54450.5460.5468Semiconductor diodes begin conducting electricity only if a certain threshold voltage or cut-in voltage is present in the forward direction. The voltage drop across a forward-biased diode varies only a little with the current, and is a function of temperature; this effect can be used as atemperature sensor. Within a given range of temperature, the resistance varies linearly with temperature.U=-0.0025T+0.5425，as the I=100A,so,R=-25T+5424,the temperature is 25Error analysis:1. The temperature is tested indirectly, so the measured temperature is a little slower or higher than the correct one,If not precise, then our result of the coefficient