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Photoelectric approach degree switch

A photoelectric approach and switch technology, which is applied in the direction of electronic switches, electrical components, electromagnetic wave reradiation, etc., can solve the problems of unreliable results and achieve the effect of reliable operation

Inactive Publication Date: 2003-06-11
OPTOSYS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This prior art approach also has considerable disadvantages
A major disadvantage is the time required to compute the correlation, and also the unreliability of the obtained results

Method used

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  • Photoelectric approach degree switch
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  • Photoelectric approach degree switch

Examples

Experimental program
Comparison scheme
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no. 1 example to

[0049] A first embodiment of the evaluation device 16 takes into account the following facts:

[0050] Even with randomly modulated signals, pulse collisions can still occur. Furthermore, the occurrence of such collisions increases with the number M of transmitters located in the same room. By influencing the evaluation of a train of pulses N on the receiver side by means of the evaluation device 16 , it is ensured that the overall collision probability is reduced below the values ​​required for the particular application. Therefore, a continuous continuous reception of N valid signals is required to trigger a state change of the receiver output signal, which is equivalent to an object detection signal. In this context, each received pulse will be considered to be valid, having practically the same instantaneous position as the corresponding transmitted light pulse, however irrespective of whether the pulse was actually transmitted by the transmitter associated with the recei...

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Abstract

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 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.

Description

technical field [0001] The present invention relates to an optoelectronic proximity switch for detecting the presence of objects in a surveillance area, the optoelectronic proximity switch comprising [0002] an optical pulse emitter for injecting emitted light pulses into the surveillance area triggered by the output signal of the pulse generator and emitted at time intervals between individual pulses, and [0003] An optical receiver associated with an optical pulse emitter and a surveillance area arranged in such a way that, in the absence of an object to be detected in the surveillance area, it does not actually receive light from the optical pulse emitter, but in the surveillance When a detected object appears in the area, it receives a certain amount of reflected light from the optical pulse transmitter, so that the received signal evaluation device connected to the optical receiver generates a detection signal of the object. [0004] The invention also relates to a sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/48G01S17/02G01S17/88H03K17/94
CPCH03K17/941
Inventor 彼得·赫姆利彻
Owner OPTOSYS SA