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Unformatted text preview: tiometer in such a way that the diffuse sensor reacts to
the plastic film and not to the inside of the packaging on the other side. The diffuse
sensor must be aimed vertically at the reflecting transparent panel. Ultrasonic
proximity sensor This solution requires a concentration of ultrasonic emission on to the transparent
panel. A test is recommended without a transparent panel to check that the
ultrasonic proximity sensor does not respond to the packaging itself. This may
happen in the case of a large distance and proximity sensors with an ultrasonic cone
which is opened too wide. In certain circumstances, the use of a sound absorbing
aperture plate is required. This proximity sensor too must be directed vertically at
the transparent panel. 260 © Festo Didactic GmbH & Co. KG • FP 1110 16. Solutions Fig. 16.4.2: Ultrasonic proximity sensor with a sound-absorbing shield (material: e.g. felt) 16.5
Solutions to exercises
from Chapter 6 Exercise 6.1 Environmental effects on optical proximity sensors
In a dus...
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- Spring '12