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# 06 - ENGR 201 Evaluation Presentation of Experimental Data...

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5/3/2011 ENGR201 Lecture 6 Spring 2011 1 ENGR 201 Evaluation & Presentation of Experimental Data Lecture 6 Temperature Measurement T. Chmielewski, Electrical & Computer Engineering D. Miller, Mechanical Engineering & Mechanics Drexel University 5/3/2011 ENGR201 Lecture 6 Spring 2011 2 Midterm Performance Count: 259 Average: 81.1 Median: 83.0 Maximum: 105.0 Minimum: 40.0 Standard Deviation: 13.63

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5/3/2011 ENGR201 Lecture 6 Spring 2011 3 Reading and Homework • Reading all of Chapter 8 Temperature Measurement – Review Examples 8.5, 8.6, 8.7, 8.8 (ice baths are not always available or practical), 8.11 – Pay special attention to Section 8.5 Thermoelectric Temperature Measurement Homework Problems 8.8, 8.9, 8.15, 8.17, and 8.18 5/3/2011 ENGR201 Lecture 6 Spring 2011 4 Additional Announcement Quiz this week on Uncertainty analysis and Propagation of Error – Open Thursday 5:00 PM through Friday 5:00 PM – Coverage Lecture 4, 5 reading, lecture notes and problem sets
5/3/2011 ENGR201 Lecture 6 Spring 2011 5 Measuring Temperature Very common parameter in engineering – body temperature (fever) – monitor chemical/biological reaction – semiconductor wafer processing – air temp (HVAC, environmental) – curing temperature (epoxies, concrete) – many, many more applications 5/3/2011 ENGR201 Lecture 6 Spring 2011 6 History of Temperature Measurement Based on zeroth law of thermodynamics – two systems each in thermal equilibrium with a third are in thermal equilibrium with each other Long history – associated with some great names Galileo (1565-1642) – barothermoscope ( temp and pressure ) Newton (1642-1727) – fixed points: freezing water and human armpit Fahrenheit (1686-1736) – 180 units between frozen and boiling water (at atmospheric pressure); successful Hg thermometer Celsius (1701-1744) – 100 units between boiling-freezing water (inverted scale, i.e. boiling was 0) Linnaeus (1707-1778) – brought Celsius scale to present form

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5/3/2011 ENGR201 Lecture 6 Spring 2011 7 International Calibration Standards Table 8.1 Temperature Fixed Points Defined by ITS-90 (Figiola & Beasley, Wiley & Sons, 2006) LVE (liquid vapor equilibrium); SLE (solid liquid equilibrium) 5/3/2011 ENGR201 Lecture 6 Spring 2011 8 General Measurement System
5/3/2011 ENGR201 Lecture 6 Spring 2011 9 Temperature Sensor Parameters 5/3/2011 ENGR201 Lecture 6 Spring 2011 10 Sensing Element – what property responds to Temperature Mechanical Property Sensors Density – thermal expansion Fluid-Expansion Temperature Measurement Devices Bimetallic Temperature Measurement Devices Change-of-State Temperature Measurement Devices Electrical Sensors Thermocouple Temperature Measurement Sensors (TC) Resistance Temperature Devices (RTD) Precious Metal (RTD) Semiconductor (Thermistor, Diode) Optical Sensors – Photometer Infrared Temperature Measurement Devices (IR)

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5/3/2011 ENGR201 Lecture 6 Spring 2011 11 Mechanical Property Sensors Bimetallic Element (a,b,c) Fluid Expansion (d) Change of State (e) –e.g. liquid crystal (d) (e) 5/3/2011 ENGR201 Lecture 6 Spring 2011 12 Bimetal Element Metal 1 Metal 2 Heat Added Principle of operation
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06 - ENGR 201 Evaluation Presentation of Experimental Data...

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