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physics: dIFFrAcTIon APPArATUS
Collecting intensity vs. position data for a diffraction pattern
a
b
Double-slit diffraction pattern with 0.04 mm slits
separated by 0.25 mm, 532 nm laser wavelength
92 VernIer SoFTWAre & TechnoLoGY- |- call toll free 888-vERNiER (888-837-6437)- |- www.vernier.com
diffraction Apparatus
$549 order code DAK
a. Diffraction Apparatus, order code DAK, $549
The diffraction Apparatus lets students create, view, and measure
diffraction and interference patterns. The included red diffraction Laser
provides a clean monochromatic light source. Slits are made by depositing
metal fi lm on glass, creating extraordinarily clean slits with fully opaque
blocking areas. These high-precision slits cast clean diffraction and
interference patterns, ideal for quantitative matching of intensity vs.
position predictions.
The Linear Position Sensor and high Sensitivity Light Sensor completes
the diffraction Apparatus. 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 light sensor has three ranges,
allowing the study of fi ne details or gross features of patterns. To measure
position, the light sensor is mounted on a novel Linear Position Sensor.
This position sensor uses a precision optical encoder to measure translation
with better than a 50 micron resolution. Since it is optically based, without
gears or racks, it has zero backlash.
data collection is performed by choosing a slit, directing the laser
through the slit, and choosing an entrance aperture for the light sensor.
Both the light sensor and position sensor connect to your interface. The
light sensor is moved by hand over a 150 mm distance, tracing out the
diffraction pattern.
The diffraction Apparatus requires a combination 1.2 m Track/optics
Bench, individually or part of the Vernier dynamics System. An optional
Green diffraction Laser is also available, so that the effect of wavelength
on the pattern can be measured.
b. Green Diffraction laser, order code GDl-DAK, $250
The Green diffraction Laser is an optional accessory for the diffraction
Apparatus. operating at 532 nm, it allows students to see and measure
how diffraction patterns depend on light wavelength.
note that the Green Laser does not include its own power supply. It uses
the same power supply as the red diffraction Laser, which is the same as
the LabQuest power supply.