US 7,609,387 B2 · Method and measuring device for measuring an absolute distance

Abstract

In a method and a measuring device (10) for measuring an absolute distance value corresponding with a range (9) between a measuring device (10) and a target (8), wherein for measuring the absolute distance value a number of individual measuring steps are performed with an absolute distance meter (1), a distance variation between the measuring device (10) and the target (8) is also measured with a relative distance meter (2) at least approximately simultaneously with these individual measuring steps and the distance variation is taken into account as the absolute distance is being determined. Preferably an iterative method comprising several sampling steps is used for measuring the absolute distance, e.g. according to the Fizeau method, wherein an output value (A) is generated from an input value (fn, fn+1, fn+2, . . . ) and measured in each sampling step. The output value (A) is dependent on the input value (fn, fn+1, fn+2, . . . ) and on the distance.

Claims9

Dependent claims

A method for measuring an absolute distance corresponding with a range (9) between a measuring device (10) and a target (8), comprising:

executing several individual measuring steps by means of an absolute distance meter (1) for measuring the absolute distance, wherein at least approximately simultaneously with said individual measuring steps the method executes the following steps:
a relative distance meter (2) measuring a distance variation between the measuring device (10) and the target (8) as a transient value of a target displacement
the absolute distance meter (1) taking said distance variation into account when determining the absolute distance;
the absolute distance meter (1) computing at the absolute distance value iteratively through several sampling steps,
the relative distance meter (2) detecting distance variations between the measuring device (10) and the target (8) arising between two sampling steps;
and
incorporating said distance variations in the control of the absolute distance meter (1) in the later of the two sampling steps.

4 more elements

A measuring device (10) for measuring an absolute distance, comprising:

an absolute distance meter (1) for the determination of an absolute distance corresponding to a range (9) between the measuring device (10) and a target (8),
a relative distance meter (2) for the determination of a distance variation between the measuring device (10) and a target (8) as a transient value of the target's displacement, that the absolute distance meter (1) is designed to generate the absolute distance value iteratively across a number of individual measuring steps, and
means to take into account the distance variations between the measuring device (10) and the target (8), arising between two sampling steps and detected by the relative distance meter (2), during the determination of the absolute distance by the absolute distance meter (1) in the later of the two sampling steps.

Dependencies are inferred from the claim text.

Method and measuring device for measuring an absolute distance

Life of this patent

Method and measuring device for measuring an absolute distance

Life of this patent

Abstract

Claims9