3B Scientific Test Vessel - Handbuch (Seite 8)

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2.2 Set-up for U10008 test container
1 Adjustment screw for changing the angle of the transducer
2 Lid
3 Transducer holder
4 Ultrasonic transducer (supplied with U10006)
5 Securing screw for laser diode
6 Slot for lens holder
7 Laser holder
8 Securing screw for ultrasonic transducer
9 Glass vessel
Standing ultrasonic waves are generated in a special
container. It allows the angle of incidence of the waves
to be set precisely to the perpendicular by means of a
special holder for the ultrasound transducer.
The test vessel consists of a glass vessel with a lid and a
holder for the transducer, three adjustment screws to
set the alignment for the standing wave and a laser
holder perpendicular to the axis of the waves which also
has a holder for a lens so that the ultrasonic waves and
the Debye-Sears effect can be projected.
2.3 Lens on a glass slide
A plane-convex lens is attached to a rectangular slide.
This is inserted into the slot in the laser holder of the
test container for experiments involving projection.
1 Plano-convex lens (f=100 cm)
2 Glass slide
3 Grip
The following illustration shows how the lens should
be properly placed in the test container.
2.4 Laser diode (U10007)
1 Laser beam window
2 Laser module jacket
3 Plug for connecting to ultrasound generator
4 Connecting lead
Class II laser diode for demonstrating the Debye-Sears
effect and projecting ultrasonic waves for use with the
ultrasound generator and test container.
3. Experiment procedure
3.1 General instructions for experiments
Pay attention to the following instructions if the ex-
periment is to work:
• Use water that contains as little air as possible since
air bubbles disturb both the ultrasound field and
the refraction of the laser beam.
• Any air bubbles around the probe should be re-
moved.
• Allow for the maximum distance between the test
container and the projection screen.
• When no measurements are being made, the ul-
trasound should be switched off so that the test
fluid does not heat up.
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