GRAVIMETER WITH LIQUID SENSITIVE ELEMENT Russian patent published in 1996 - IPC

FIELD: measurement technology. SUBSTANCE: gravimeter has rigid elongated thermostated reservoir filled with liquid partially. The reservoir is made of two identical sections connected by channels for passing liquid and gases through. Thermo-compensating washings are introduced into channel for liquid flowing through. Interference-holographic optical system is used for measurement of liquid level in working section. The system has laser, collimator, focusing lens, rotary mirror mounted at 46 deg to optical axis of focusing lens, hologram, optical reflector-float, one more rotary mirror, photoreceiving unit; all the units are mounted in sequence and connected optically. Light fluxes, which form interference pattern - one flux diffracted from hologram and the other one reflected by optical reflector-float - are converted into binary code. Free fall acceleration is calculated from characteristics of change in binary code at shifts of float referring to time fixation. EFFECT: improved precision of measurement. 7 dwg