TemperatureSensors-Report4

TemperatureSensors-Report4 - Temperature Sensors Lab Report...

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Unformatted text preview: Temperature Sensors Lab Report 4 BMEN 305 Fall 2007 P a g e | 2 Table of Contents 1. Introduction.. ...2 2. Materials and Methods.... ...3 1. Building a Thermometer Using a Thermistor and Wheatstone Bridge Circuit3 2. Building a Thermometer Using a Thermocouple .4 3. Results and Discussion... .....5 1. Building a Thermometer Using a Thermistor and Wheatstone Bridge Circuit5 2. Building a Thermometer Using a Thermocouple .7 4. Conclusion... ..9 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 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. P a g e...
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This note was uploaded on 05/05/2008 for the course BMEN 305 taught by Professor Meissner during the Fall '07 term at Texas A&M.

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TemperatureSensors-Report4 - Temperature Sensors Lab Report...

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