ACTIVE MOTION SENSOR

摘要

In so-called active sensors that transmit to an electronic regulator (7) an output signal (IS) whose amplitude does not depend from the speed of the encoder nor from the distance between sensor (6) and encoder (5), determining whether the length (d) of the distance set between the sensor (6) and encoder (5) is sufficiently small to ensure that the input signal generated in the sensor (6) has a sufficient amplitude even when the distance is dynamically increased represents a problem, since said length (d) may not be determined from the output signal (IS). If the input signal induced by the encoder (5) in the sensor (6) is too low, a sensor-inherent hysteresis threshold (V1) is not exceeded and no output signal (IS) is generated. In order to prevent the sensor (6) from being unintentionally driven to the limits of the maximum admissible distance between sensor and encoder, the sensor-inherent hysteresis threshold (V1) is set at a higher value (V2) for test purposes. If a sufficient input signal is generated even at said higher hysteresis (V2), it may be supposed that the sensor is correctly mounted.