| 摘要 |
Photoelectric proximity switch (11) for detecting the presence of an object (12) in a monitored area. The proximity switch (11) comprises a light pulse transmitter (13) for emitting transmitting light pulses into the monitored area that are triggered by an output signal of a random signal generator or a pseudo-random signal generator (14) and emitted with a time interval between each of them, as well as a light receiver (15) arranged in relation to the light pulse transmitter (13) and to the monitored area in such a manner that in the absence of an object (12) to be detected in the monitored area, it receives essentially no light from the light pulse transmitter (13), but in the presence of an object to be detected in the monitored area, it receives such an amount of light from the light pulse transmitter (13) due to reflection that a receiving signal evaluating device (14) connected to the light receiver (15) and to the random signal generator or the pseudo-random signal generator (14) delivers an object detection signal.
|
