Accession Number : ADP009101

Title :   Optical Techniques for Time and Frequency Transfer,

Corporate Author : OBSERVATOIRE DE PARIS (FRANCE)

Personal Author(s) : Baumont, Francoise ; Gaignebet, Jean

Report Date : 02 DEC 1993

Pagination or Media Count : 11

Abstract : Light has been used as a mean for time synchronization for a long time. The flight time was supposed to be negligible. The first scientific determination of the velocity of the light was done by measuring a round trip flight time on a given distance (France 1849). The well known frying clock experiment leading to Einstein General Relativity is another example (1905). The advent of lasers, particularly short pulse and modulated ones, as well as the improvements of the timing equipments have led to new concepts for time and frequency transfer. We describe in this paper some experiments using different techniques and configuration which have been proposed and tested in this field since the beginning of the space age. Added to that, we set out advantages, drawbacks and performances achieved in the different cases.

Descriptors :   *TIME INTERVALS, *PRECISION, *RELATIVITY THEORY, *COMPENSATION, CLOCKS, CONFIGURATIONS, DETERMINATION, FREQUENCY, LASERS, LIGHT, SHORT PULSES, FRANCE.

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE