Time interval measurement method for laser distance measurement

摘要

The method involves triggering a first charging process of a capacitor (C1) at the beginning of a time interval or at appearance of a first event (T1). The first charging process of the capacitor is terminated in dependence on a climbing or falling flank of the clock signal delivered by a clock generator. At completion of the time interval or at appearance of a second event (T2), a second charging process of a capacitor (C2) is triggered, and the second charging process of the capacitor is terminated at a climbing or falling flank of the clock signal. The amount of clock pulses between the clock flank terminating the first charging process and that terminating the second charging process is determined using a digital counter. The time interval is calculated through addition of the duration of the first charging process and the counted clock pulses, and following subtraction of the duration of the second charging process.