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Abstract

In order to improve the measuring accuracy in optical distance meters determining transit-time, the meters having optical senders emitting short pulses (11), optical receivers in which the reflected pulse received from the object to which the distance is being measured is converted to a corresponding electrical pulse (12), the signal received is repeatedly digitalized (13a, 13b, etc.) and these digital values are stored in a memory. Each of these stored values, is then fed from the memory one by one a predetermined number of times (14a, 14b, etc.) to a digital low-pass filter with deriving characteristic within its pass band. The number of computations of this filter before the output magnitude (15a, 15b, etc.) of the filter passes zero (16) constitutes a measurement (17) of the distance to the object being measured.

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First Claim