3B Scientific Ultrasonic Motion Sensor - Manual (Page 2)

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5. Technical data
Measuring range: 0.15 m –10 m approx.
Resolution: < 5 mm
Accuracy: ± 1 %
Sensor type: Electrostatic 50 kHz -
transducer
Angle of sensor
wedge opening:
15° @ - 6 dB
Burst repeat frequency: 40 Hz to 5 Hz,
automatically adapted
according to the distance
from the object
5. Operation
• Screw the stand rod into the M6 nut provided.
• Plug the miniDIN cable into the miniDIN socket
and connect up the 3B NETlog
TM unit.
• Attach the motion sensor mechanically to the
experiment set-up, e.g. in front of an air track,
under a free-falling body or in the path of a vi-
brating pendulum bob.
• Turn on the 3B NETlog TM unit and wait for it to
detect the sensor.
• Carry out measurements and evaluate them.
6. Applications
Position, speed and acceleration of moving objects.
Movements in the range of the sensor.
Detecting simple harmonic motion of a weight on a
spring.
Measuring the period of an oscillating body.
Objects moving up and down.
The bouncing of a ball.
7. Sample experiment
Uniform acceleration followed by change
of direction
Required equipment:
1 3B NETlog TM unit U11300
1 3B NETlab TM program U11310
1 Ultrasonic motion sensor U11361
1 Universal clamp U13255
1 Air track, 1.6 m U40405
1 Glider 450 g, blue U40422
1 Air-flow generator U15425
1 Conical reflector U40462
• Set up the experiment as shown in Fig. 1. Also
take note of the instructions for the air track.
• Attach the motion sensor using a universal
clamp to the rubber-band launcher on the air-
inlet side of the air track, see detailed photo-
graph, Fig. 2.
• Attach the stopper with the pulley to the other
end of the air track. Make sure that the stopper’s
spring buffer is facing along the track.
• Lower the track by adjusting the height of its
feet so that the rider moves under its own
weight towards the right-hand end of the track.
• Connect the sensor by means of its miniDIN
connector lead to analog input A or B on the 3B
NETlog
TM unit.
• Wait for the 3B NETlog TM unit to detect the sen-
sor.
• Attach a conical reflector U40462 to the glider
U40422 and turn on the air track.
• Start measuring, starting with the rider moving
away from the air inlet end of the track.
• Open the experiment template for “speed meas-
urement on an air track” in 3B NETlab
TM , which
includes all the necessary settings for evaluating
the measurements.
• Carry out the experiment and evaluate the re-
sults. See Fig. 3.