大学物理实验报告英文版--温度传感器

1 Physical Lab Report Temperature Sensors Writer 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 resistor Within range the resistanc temperature relation is T B ARTexp If we calibrate the resistance at a temperature T0 to be R0 we can rewrite this relation into 0 0 11 lnln TT BRRT T C 4 5 4 8 5 0 5 3 5 5 5 8 6 1 6 4 70 7 3 7 8 8 0 8 2 8 4 8 6 8 8 9 0 9 3 9 6 9 9 1 0 2 1 0 5 1 0 8 1 1 1 1 1 3 1 1 5 1 1 8 R 4 0 0 0 3 7 0 2 3 4 7 3 3 1 0 6 2 8 6 8 2 5 4 4 2 3 0 3 2 1 0 1 17 44 1 5 6 9 1 3 4 3 1 2 8 2 1 2 1 2 1 1 4 6 1 0 8 9 1 0 1 8 9 6 7 8 9 6 8 3 8 7 7 3 7 2 4 6 6 8 6 2 4 5 8 6 5 6 1 5 3 8 5 0 5 2 After 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 resistors A platinum resistor has a temperature resistance relation of 2 0 1TBATRRT T C 27303336394245485154576063666972757883889398 U V 0 11 5 0 11 83 0 12 12 0 12 35 0 12 6 0 12 83 0 13 03 0 13 21 0 13 41 0 13 62 0 13 8 0 13 97 0 14 13 0 14 3 0 14 46 0 14 65 0 14 79 0 14 94 0 15 16 0 15 41 0 15 62 0 15 83 T C14118520 2 4 6 7 8 3 U V0 1064 0 10 57 0 10 49 0 10 44 0 10 36 0 10 3 0 10 24 0 10 18 0 10 12 0 10 08 0 10 03 From the graph I get the coefficient of x2 is B 2 8 10 7 oC the coefficient of x is A 6 10 4 C 3 PN diode temperature sensor T C353842454751535557596164669899101103 U V 0 4 7 0 4 62 0 4 5 0 4 414 0 4 366 0 4 246 0 4 201 0 4 138 0 4 075 0 4 017 0 3 958 0 3 884 0 3 835 0 2 961 0 2 929 0 2 884 0 2 83 T C6972747678808385878890929496105106110 U V 0 3 752 0 3 665 0 3 606 0 3 553 0 3 501 0 3 449 0 3 386 0 3 318 0 3 264 0 3 228 0 3 172 0 3 123 0 3 063 0 3 019 0 2 771 0 2 746 0 2 634 T C1412975320 1 2 3 4 5 U V 0 5 122 0 5 164 0 5 221 0 5 265 0 5 3 0 5 334 0 5 351 0 5 387 0 5 408 0 5 425 0 5 445 0 5 46 0 5 468 4 Semiconductor 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 a temperature sensor Within a given range of temperature the resistance varies linearly with temperature U 0 0025T 0 5425 as the I 100 A so R 25T 5424 the temperature is 25 C Error 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 resu