An optional Green Diffraction Laser is also available so that the effect of wavelength on the pattern can be measured. The Diffraction Apparatus requires a Combination 1.2 m Track/Optics Bench individually or part of the Dynamics Cart and Track System. The light sensor is moved by hand over a 150 mm distance, tracing out the diffraction pattern. Both the light sensor and position sensor connect to your interface. Since it is optically based, without gears or racks, it has zero backlash.ĭata collection is performed by choosing a slit, directing the laser through the slit, and choosing an entrance aperture for the light sensor. This position sensor uses a precision optical encoder to measure translation with better than 50-micron resolution. To measure position, the light sensor is mounted on a novel Linear Position Sensor. The light sensor has three ranges, allowing the study of fine details or gross features of patterns. In order to provide excellent spatial resolution, a selectable entrance aperture restricts the width of the pattern viewed by the High Sensitivity Light Sensor. ![]() The Linear Position Sensor and High Sensitivity Light Sensor completes the Diffraction Apparatus. Problem: A diffraction grating with d1 micron (106 m) is illuminated at normal incidence. In the process of spreading out, it interferes with itself to create the pattern of light and dark spots that we call a diffraction pattern. EXERCISE (Optional): Taylor Problems 3.25, 3.30, 3.31. We can view diffraction as light spreading out when it comes up to a hole or other barrier, and trying to get around that barrier. These high-precision slits cast clean diffraction and interference patterns, ideal for quantitative matching of intensity vs. What I mean is each light wave emerging from the slit was 1.1 wavelengths shifted compared to the previous ( just as in the constructive point you had each light wave being 1 wavelength shifted compared to the other) and therefore, over a large number of light waves from the many slits, we had each wave cancelling out with the other. The purpose of this lab is to measure the wavelength of light from a HeNe Laser using a steel ruler and a meter stick. ![]() Slits are made by depositing metal film on glass, creating extraordinarily clean slits with fully opaque blocking areas. The included Red Diffraction Laser provides a clean monochromatic light source. The Diffraction Apparatus lets students create, view, and measure diffraction and interference patterns.
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