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Unformatted text preview: 6.4 Detection of burnished steel
The response of this optical sensor is determined by the environment. The
background or wall towards which it is directed, reflects sufficient light to trigger a
response. Anodised aluminium, for instance, reflects very strongly. The reason why
the sensor switches off is because burnished steel has a low degree of reflection. b 1
a 2 3 Distance between proximity sensor and object (a)
Distance between proximity sensor and background (b) Setting potentiometer (1) Object (2) Background (3) Fig. 16.5.1: Background fade-out To begin with, efforts should be made to adjust the diffuse sensor by means of a
setting potentiometer so that it responds to the burnished steel part at distance "a"
only and not to the background at distance "b". If this is not possible, then the
background must be covered with less reflecting material. Exercise 6.5 Electrical connection of proximity sensors
In the case of unregulated power supplies with filter, it is possible for voltage peaks...
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- Spring '12