| 摘要 |
<p>The device (1) has a transmission diode (5) emitting light waves controllable by an electrical switching circuit (3) in an impulse mode. A comparator (11) is connected in series to a receiving diode (6), where the comparator measures voltage value changes that are found at the receiving diode during the approach of objects (2). The comparator determines an operating voltage of the receiving diode temporally converted to a transmission impulse of the transmitting diode, where the operating voltage is controllable by another electrical switching circuit (4).</p> |
