Thermal_Emission_lab_01-10-10 - Thermal Emission using...

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Thermal Emission using Leslie’s Cube Learning Goals : Design and carry out an investigation using an infrared sensor to explore the ways various surfaces transmit infrared “light.” Write a hypothesis that can be tested with the lab equipment, carry out the test, then modify the hypothesis as a result of the investigation, suggest a test for the modified hypothesis and carry it out. Use a spreadsheet to graph data. Materials: Infrared sensor, Leslie’s cube apparatus, multimeters, coated Styrofoam sheets, small glass sheets Tools for Learning : Guides to graphing with Excel Pre-lab exercise : Thermal Emission Introduction : Today you will investigate thermal radiation from different kinds of surfaces. Thermal radiation is part of the electromagnetic spectrum, not visible to the human eye, though human sense of touch gives us a rough estimate of infrared radiation (heat). Think for example about touching the outside of a coffee cup to see if it is still warm. Something that feels warm is radiating more infrared that something that feels cool. Thermal radiation sensor . In this lab we use a much more sensitive gauge of the kind of infrared radiation given off by a simple box heated by a light bulb. The sensor produces a voltage that is proportional to the intensity of the radiation that falls on it. This sensor used in this lab is best for measuring radiation in the infrared from about .5 to 40 micrometers. It is sensitive to changes in temperature from about -65 to 85 degrees C. Leslie’s Cube.
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This note was uploaded on 02/06/2011 for the course ASTR 114 taught by Professor Staff during the Spring '08 term at George Mason.

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Thermal_Emission_lab_01-10-10 - Thermal Emission using...

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