Temperature_measurement_lab

Temperature_measurement_lab - Name: Date of lab: _ _...

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Name: ______________________________________________ Date of lab: ______________________ Section number: M E 345._______ Lab 10 Precalculations – Individual Portion Temperature Lab: Experimental Measurement of Temperature Precalculations Score (for instructor or TA use only): _____ / 20 1. Write and briefly explain the three thermocouple laws in your own words (sketches may be helpful). Law of intermediate metals : Law of intermediate temperatures : Law of additive voltages : 2. Read the sections in the class notes describing thermistors and RTDs, and then answer these questions: (a) Does resistance of a RTD increase or decrease with temperature? (b) Does resistance of a thermistor increase or decrease with temperature? 3. Suppose a student is measuring temperature with an infrared pyrometer. The temperature displayed by the pyrometer is T ind . The student wants to write a simple equation for the actual temperature T H of an object, corrected for its emissivity, using a correction factor C correction as in this equation, correction ind H TC T = . The emissivity of the object is approximately 0.73. The infrared pyrometer has been calibrated assuming the emissivity of the object is 0.95 (the same assumption made by the instrument used in this lab). Calculate the correction factor C correction for the object. If T ind = 250 o C, calculate T H in o C. Give all answers to 3 significant digits.
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Cover Page for Lab 10 Lab Report – Group Portion Temperature Lab: Experimental Measurement of Temperature Name 1: ___________________________________________________ Section M E 345._______ Name 2: ___________________________________________________ Section M E 345._______ Name 3: ___________________________________________________ Section M E 345._______ [Name 4: ___________________________________________________ Section M E 345._______ ] Date when the lab was performed: ______________________ Group Lab Report Score (For instructor or TA use only) : Lab experiment and results, plots, tables, etc. _____ / 50 Discussion _____ / 20 Neatness & grammar _____ / 10 TOTAL ______ / 80 Comments (For instructor or TA use only) : NOTE: The instructor or TA reserves the right to deduct points for any of the following: Arriving late to lab or leaving before your lab group is finished. Not participating in the work of your lab group (freeloading). Causing distractions, arguing, or not paying attention during lab. Other (at the discretion of the instructor or TA).
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Temperature Lab: Experimental Measurement of Temperature Author: John M. Cimbala, Penn State University Latest revision: 15 April 2008 Introduction and Background ( Note : To save paper, you do not need to print this section for your lab report.) Temperature can be measured with a wide variety of instruments, many of which utilize totally different principles of operation. As discussed in class, there are four primary categories of temperature measuring devices, based on the physical principle employed: mechanical (liquid-in-glass thermometers, bimetallic strips, etc.), thermojunctive (thermocouples), thermoresistive (RTDs and thermistors), and radiative (infrared and optical pyrometers). Detailed discussions about each of these can be found in the class notes and web lectures. Five temperature measuring instruments are used in this lab, representing all four of the above categories: liquid-in-glass thermometer , thermocouple , thermistor , infrared pyrometer , and optical pyrometer . Temperature measurements from several of
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This note was uploaded on 07/23/2008 for the course ME 345 taught by Professor Staff during the Spring '08 term at Penn State.

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Temperature_measurement_lab - Name: Date of lab: _ _...

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