Method and measuring device for measuring an absolute distance

Details Method and measuring device for measuring an absolute distance Method and measuring device for measuring an absolute distance

G - Physics

01

S

G01S 17/32 (2006.01)

Patent

CA 2584347

The invention relates to a method and a measuring device (10) for measuring an absolute distance corresponding to a section (9) between a measuring device (10) and a target (8), the measurement of said absolute distance by means of an absolute distance measuring device (1) being carried out in several individual measuring steps. According to said method, at least approximately simultaneously with the individual measuring steps, a respective distance variation between the measuring device (10) and the target (8) is also measured with a relative distance measuring device (2) and said variation is taken into account during the determination of the absolute distance. Preferably an iterative method comprising several scanning steps is used to measure the absolute distance, for example according to the Fizeau method. In each scanning step an output value (A) is generated from an input value (fn, fn+1, fn+2, ...) and is measured, said output value being dependent on the input value (fn, fn+1, fn+2, ...) and the distance. A respective distance variation, which is produced between one scanning step and the following scanning step, is measured and is used during the determination of the input value (fn+1, fn+2, fn+3, ...) for the following scanning step to compensate the distance variation.

L'invention concerne un procédé et un appareil de mesure (10) pour mesurer une distance absolue correspondant à un intervalle (9) entre l'appareil de mesure (10) et une cible (8), la mesure de cette distance absolue au moyen d'un appareil de mesure de distance absolue (1) étant réalisée en plusieurs étapes. Au moins presque simultanément à chacune de ces étapes de mesure, une variation de distance entre l'appareil de mesure (10) et la cible (8) est mesurée au moyen d'un appareil de mesure de distance relative (2) et prise en compte lors de la détermination de la distance absolue. La distance absolue est de préférence mesurée selon un procédé itératif comprenant plusieurs étapes de balayage, par exemple, selon la méthode de Fizeau. Dans chaque étape de balayage une valeur de sortie (A) est générée par une valeur d'entrée (fn, fn+1, fn+2, ...) et mesurée, cette valeur de sortie (A) dépendant de la valeur d'entrée (fn, fn+1, fn+2, ...) et de la distance. Une variation de distance entre une étape de balayage et la suivante est mesurée et utilisée lors de la détermination de la valeur d'entrée (fn+1, fn+2, fn+3, ...) pour l'étape de balayage suivante pour compenser la variation de distance.

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