TemperatureSensors-Report4

TemperatureSensors-Report4 - Temperature Sensors Lab Report...

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Temperature Sensors – Lab Report 4 BMEN 305 Fall 2007
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P a g e  | 2 Table of Contents 1. Introduction………………………………………………….………………. ………………………………. ..……………2 2. Materials and Methods………………………. .……………….………………. ……………….……………………. .3 2.1 Building a Thermometer Using a Thermistor and Wheatstone Bridge  Circuit…………………3 2.2 Building a Thermometer Using a  Thermocouple …… ……………………………………………….……4 3. Results and Discussion……………….……………….………………. …………………….…………….…. .……….5 3.1 Building a Thermometer Using a Thermistor and Wheatstone Bridge  Circuit…………………5 3.2 Building a Thermometer Using a  Thermocouple …… ………………………………………………….…7 4. Conclusion………………………….……………….……………….………………. …………………….…………………9
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P a g e  | 3 Introduction The purpose of this lab is to gain a understanding of the common temperature  sensors, the Wheatstone bridge circuit with a thermistor and a K-Type Thermocouple.  The Wheatstone bridge circuit interfaces with the thermistor to measure temperature.  The K-Type Thermocouple produces a voltage difference in order to measure  temperature via the Seebeck Effect.  Materials and Methods Part 1: Building a Thermometer Using a Thermistor and Wheatstone Bridge Circuit
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P a g e  | 4 First, a thermometer was built using a thermistor and the Wheatstone bridge circuit. The  Wheatstone bridge circuit was constructed as shown in figure 1. The potentiometer was used  for “R2”, which has 3 connections. The difference between V1 and V2 was measured by  connecting a wire from V2 to ACH5+ and V1 to ACH5-. Figure 1: Wheatstone  bridge circuit The voltage difference  was monitored  through LabVIEW. Once  the VI  (thermistor.vi; shown in  fig. 2) was  implemented, the bridge  was balanced at  room temperature by  adjusting the  potentiometer until the  voltage  difference was zero.  Balancing the  bridge means adjusting  the resistors  until the voltage difference  is zero.  Calibratethermistor.vi was then used to calibrate the thermistor. The program receives the 
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TemperatureSensors-Report4 - Temperature Sensors Lab Report...

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