The background or wall towards which it is directed

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Unformatted text preview: of detection and can be mounted outside possible danger areas. Exercise 6.3 Operating reliability of optical proximity sensors By means of modulating light emission, it is possible to improve the protection of optical proximity sensors against the influence of surrounding light. This means that their sensitivity to interference as a result of ambient light is reduced. The light emitter pulses the emissions at a specified frequency actuated by a signal generator. The generator signal is transmitted to the logic module of the signal receiver. The signals are checked as to their compatibility and an output signal is generated only if this condition is met. Another possibility is to suppress the ambient light by means of a bandpass, which only allows the emission frequency of the emitter to be passed. In the case of optical proximity sensors operating in the infrared zone, additional daylight filters are installed. This further reduces the effects of the surrounding light. 262 © Festo Didactic GmbH & Co. KG • FP 1110 16. Solutions Exercise...
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