Abstract System for measuring the time difference between a master precision clock and a slave precision clock situated respectively in a master and a slave station remote from each other. The clocks generate timing pulses with respective frequencies very close to each other. The master station includes a laser source of light pulses generating luminous pulse signals, a local detector of these signals and means for transmitting them towards the slave station. The slave station includes a detector of the luminous pulse signals and means for reflecting the same towards said master station. Two chronometers in the master station measure the time difference between the instant of generation of a luminous pulse signal and a master clock timing pulse and the time difference between the instant of generation of a luminous pulse signal and the instant of detection of a reflected back luminous pulse signal and a third chronometer in the slave station measures the time difference between the instant of detection of a luminous pulse signal and a slave clock timing pulse.
Inventors
👤 J Besson
👤 J Boillot
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-27 05:39
CPC Classifications
G; G04; G04G; G04G7/00; G04G7/02; G04F; G04F10/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
202 words
A system for measuring the time difference between a master precision clock and a slave precision clock situated respectively in a master and a slave station remote from each other, said clocks generating timing pulses with respective frequencies very close to each other, said system comprising a laser source of light pulses located in the master station and generating luminous pulse signals, means in said master station for locally detecting said luminous pulse signals, means in said master station for transmitting said luminous pulse signals towards said slave station, means in said slave station for detecting said luminous pulse signals, means in said slave station for reflecting said luminous pulse signals towards said master station, a first and a second chronometer in the master station for respectively measuring the time difference between the instant of generation of a luminous pulse signal and a master clock timing pulse and the time difference between the instant of generation of a luminous pulse signal and the instant of detection of a reflected back luminous pulse signal and a third chronometer in the slave station for measuring the time difference between the instant of detection of a luminous pulse signal and a slave clock timing pulse.
Claim 2
Independent Claim
202 words
A system for measuring the time difference between a master precision clock and a slave precision clock situated respectively in a master and a slave station remote from each other, said clocks generating timing pulses with respective frequencies very close to each other, said system comprising a laser source of light pulses located in the master station and generating luminous pulse signals, means in said master station for locally detecting said luminous pulse signals, means in said master station for transmitting said luminous pulse signals towards said slave station, means in said slave station for detecting said luminous pulse signals, means in said slave station for reflecting said luminous pulse signals towards said master station, a first and a second chronometer in the master station for respectively measuring the time difference between the instant of generation of a luminous pulse signal and a master clock timing pulse and the time difference between the instant of generation of a luminous pulse signal and the instant of detection of a reflected back luminous pulse signal and a third chronometer in the slave station for measuring the time difference between the instant of detection of a luminous pulse signal and a slave clock timing pulse.
Claim 3
Dependent Claim
77 words
A system as set forth in claim 1 in which the means in the slave station for reflecting the luminous pulse signals towards the master station is formed by an array of reflecting pyramids adjacent to one another and having a vertex angle of 90* and the means in the slave station for detecting the luminous pulse signals comprise a hole in said array, a light telescope behind said hole and a photomultiplier cooperating with said telescope.