大学物理实验报告英文版--温度传感器

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 BWithin range, the resistanc-temperature relation isRTAexpT

If we calibrate the resistance at a temperature T0 to be R0, we can rewrite this relation into

11lnRTlnR0BTT

0T/C 1111111445555667788888999970 00011115 8 0 3 5 8 1 4 3 8 0 2 4 6 8 0 3 6 9 2 5 8 1 3 5 8 3473 3106 2868 2544 2303 2117044 1 1153649 3 1282 1212 1146 1089

R/4307 000 2 198877665555 06937262863017 6 8 3 4 8 4 6 1 8 5 8

- 1 -

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 ofRTR01ATBT2

T/C 27 30 33 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 83 88 93 98 U/V 0.115 0.0.0.0.1112121283 12 35 6 0.0.0.0.0.0.12131313131383 03 21 41 62 8 0.0.0.13141497 13 3 0.0.0.0.0.0.0.0.141414141515151546 65 79 94 16 41 62 83 T/C 14 11 8 5 2 0 -2 -4 -6 -7 -8 0.100.100.100.100.100.100.100.100.100.10U/V 0.1064 57 49 44 36 3 24 18 12 08 03

- 2 -

From the graph ,I get the coefficient of x2 is B=2.8*10-7 oC-２,the coefficient of x is A=6*10-4 C－１

3.PN diode temperature sensor T/C 35 U/V 0.47 38 0.462 72 42 0.45 74 45 47 51 53 55 57 59 61 64 66 98 99 101 103 0.40.40.40.40.40.40.40.30.30.30.20.20.20.2414 366 246 201 138 075 017 958 884 835 961 929 884 83 76 78 80 83 85 87 88 90 92 94 96 105 106 110 T/C 69 U/V 0.30.30.30.30.30.30.30.30.30.30.30.30.30.30.20.20.2752 665 606 553 501 449 386 318 264 228 172 123 063 019 771 746 634 12 9 7 5 3 2 0 -1 -2 -3 -4 -5 T/C 14 U/V 0.50.50.50.50.5122 164 221 265 3 0.50.50.50.50.50.50.5334 351 387 408 425 445 46 0.5 468

- 3 -

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=100μA,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 result of the coefficient is not that correct. 2.The ice-water is made by human, even its temperature is near 0, however, there still exists some worry weather it is 0 degree.



- 4 -