BRILLET , Alain

We present a simple two-mode telemetry procedure which eliminates cyclic errors, to allow accurate absolute distance measurements. We show that phase drifts and cyclic errors are suppressed using a fast polarization switch that exchanges the roles of the reference and measurement paths. Preliminary measurements obtained using this novel design...

A laser ranging method is described that uses the phase of an amplitude-modulated laser beam: the frequency of the modulation is permanently adjusted to maintain a constant dephasing, and the distance is deduced from its measurement. We show that phase drifts and cyclic errors are suppressed using a fast polarization switch that interchanges...

We present a laser ranging system, under development, that uses a high frequency modulated beam to achieve sub-nm resolution by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular we show that the signal, which presents...

Nous présentons deux télémètres basés sur un faisceau laser modulé en amplitude à haute fréquence (HF). L'information de distance est extraite de la phase du faisceau renvoyé par la cible. Dans la première mise en oeuvre proposée, l'erreur cyclique associée à une diaphonie optique entre la voie de référence et la voie de mesure est absente,...

We present a laser ranging system, under development, that uses a high frequency modulated beam to achieve sub-nm resolution by the combined use of interferometric and time-of-flight measurements. We first describe how the absolute distance is extracted from a two-mode interference signal. In particular we show that the signal, which presents...

Le vol en formation de satellites et l'alignement des collisionneurs de particules sont deux domainesoù la mesure de distance doit être faite avec une haute résolution et une haute exactitude.L'interférence hétérodyne utilisée pour les mesures de déplacement atteint des résolutions subnanométriques,mais il s'agit d'une mesure de phase: elle...

A novel laser ranging method is described that uses a two-mode laser source, and detection of the phase of the return beam. The design eliminates the cyclic error usually associated with phase measurements and provides unambiguous, absolute distance determination. Measurements of an 8m path are obtained at a beat frequency of 13 GHz. We analyse...

We present two different laser ranging systems under development, both based on the use of a high frequency modulated beam. The first range meter makes no use of interferometry: only the phase of the return beam is detected, in a way that rejects cyclic errors due to optical and electronic crosstalk. An Allan deviation slightly better than 10nm...

Some measurement schemes have been proposed and realized for the absolute measurement of long distances with an accuracy better than 10 nm. Published measurement setups use one or even two laser frequency combs. But significant engineering will be required to space qualify such a system. Simple methods, less technology-demanding would be...

Some measurement schemes have been proposed and realized for the absolute measurement of long distances with an accuracy better than 10 nm. Published measurement setups use one or even two laser frequency combs. But significant engineering will be required to space qualify such a system. Simple methods, less technology-demanding would be...

La mesure de longue distance à haute précision est essentielle pour les missions spatiales de vol en formation: les missions d'observation par synthèse d'ouverture nécessitent la connaissance des distances absolues et de la géométrie de la formation, avec une très haute précision. Les deux télémètres laser développés sont basés sur...