BALLISTIC LASER GRAVIMETER Russian patent published in 2002 - IPC

FIELD: measurement of absolute values of free-fall acceleration. SUBSTANCE: ballistic laser gravimeter has vacuum chamber, catapult, tested mass with corner optical reflector, laser displacement interferometer, vibration protector of horizontal pendulum type with spring suspension and reference corner optical reflector of interferometer installed in center of gravity of pendulum. In addition corner optical reflector of interferometer is mounted close to hinged support to form second information-measurement channel. Influence of seismic vibrations on result of measurement of free-fall acceleration is excluded by input of corrections by difference of readings of two channels with due account of correlation communication between them. EFFECT: raised measurement accuracy under conditions of seismic vibrations. 1 dwg