| 摘要 |
<p>The invention refers to an optoelectronic sensor by reflection, for use in the automation of technological processes and the increase of the work protection degree. The sensor has in its structure a transmitter (1), which sends out an infrared beam in short impulses according to their repetition period, radiations that are directed towards a reflector (2) which reflects them towards a receiver (3), where they are converted into electric impulses, impulses that are applied at the entry of a logical gate (4). On the other side of the gate being applied the impulses generated by the transmitter, thus achieving the coincidence between the two impulse categories, and therefore a synchronous reception. At the exit of gate (4) is attached a circuit (5) that identifies the presence or absence of impulses which supply the command voltage of a 6 output power circuit. The sensor is almost insensitive to environmental illumination, to broadband perturbations of electrical and optical nature, and ensures increased distance functioning with low power consumption.<IMAGE></p> |
