3B Scientific SW Ultrasonics Set (115 V, 50__60 Hz) - Manual (Page 10)

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Subject to technical amendments
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• Connect the ultrasonic pen to channel A and
set it up in its holder in such a way that the
tip is only about 1 mm from the template.
• Place the ultrasonic pen in its holder behind
the double slit on one of the pre-drawn wave
fronts.
• Move the ultrasonic transmitter in the direc-
tion of the beam till the phase indicator goes
out.
• Confirm the locations of the wave fronts are
as drawn on the template by moving the ul-
trasonic pen appropriately.
• Position the ultrasonic pen at a point on one
of the blue hyperbolae, carefully align it to-
wards the middle of the double slit and iden-
tify by the minimal needle deflection on the
multimeter that this is a diffraction minimum.
• Move the ultrasonic pen parallel to the dou-
ble slit and look for diffraction minima and
maxima.
Note: If the ultrasonic pen is at the position of
one of the first diffraction minima, covering one
or other of the slits should cause the intensity at
the measuring point to increase markedly. In
addition, it is possible to demonstrate with the
help of an oscilloscope that the measured
curves from the two slits have the same ampli-
tude but are phase-shifted by 180°.
8. Disposal
Should the equipment need
to be scrapped, it must not
be disposed of in normal
household waste.
• Packaging and compo-
nents should be dis-
posed of at local recy-
cling centres.