Experiment 1

Experiment 1 - E101 Experiment 1 page 1 E 101 INTRODUCTION...

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E101 Experiment 1 page 1 E 101 INTRODUCTION TO ENGINEERING AND PROBLEM SOLVING Materials Science and Engineering Experiment 1: Laser Diffraction INSTRUCTIONS SAFETY FIRST! The light from a laser pen can damage your eye if viewed directly. Do not remove the laser pen from its mount or allow the laser light to shine anywhere but on the screen of the diffraction apparatus. Turn the laser on only while making the measurements described below; leave it off at all other times. Procedure 1. Set up the apparatus as described in class. The diffraction slide contains 8 different regular arrays of lines and dots. Magnified images of these arrays are shown in Tables 1 and 2. 2. Align the diffraction slide so that the ICE logo is on the top and facing the laser pen. The 4 arrays on the bottom row of the slide are those labeled a through d in Table 1, moving from left to right. 3. Turn on the laser pen. Move the slide so that the laser beam is centered on array a . Sketch the diffraction pattern you observe in Table 1 below array a . Repeat for arrays b , c and d . Make sure your sketches clearly show the relative differences between the diffraction patterns. 4. Rotate the slide 180 degrees (turn it upside down) and place it back in the mount. This will put arrays e , f , g and h on the bottom row, moving left to right. 5. Turn on the laser pen. Move the slide so that the laser beam is centered on array e . Sketch the diffraction pattern you observe in Table 2 below array e . Repeat for arrays f, g and h . Again be sure your sketches clearly show the relative differences between the various diffraction patterns. 6. Rearrange the slide so that the laser beam is centered on array f . With the laser off, move the screen to one of the positions closer to the laser pen. Turn the laser on and make note of how the pattern changes when the screen is moved closer to the slide. Use this as your answer to question #8 in the Lab Report section. No measurements are necessary. 7.

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This note was uploaded on 08/30/2009 for the course CH CH 221 taught by Professor Gorman during the Spring '08 term at N.C. State.

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Experiment 1 - E101 Experiment 1 page 1 E 101 INTRODUCTION...

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