GYRO-STABILISED QUARTZ GRAVIMETER AND CALIBRATION METHOD THEREOF Russian patent published in 2017 - IPC G01V7/02 

FIELD: physics, measurement technology.

SUBSTANCE: invention relates to measurement technology and can be used in devices for measuring gravity and calibration methods thereof. The gravimeter comprises a gravimetric sensor in the form of a torsional dual quartz elastic system with horizontal pendulums, immersed in a damping liquid, and a photoelectric converter arranged in a biaxial gyro-platform, on the axes of which there are angle sensors and torque motors, wherein inputs of the torque motors are connected to outputs of amplifiers of stabilisation servo systems, wherein two gyroscopes and two accelerometers are mounted on the gyro-platform, which includes analogue-to-digital converters, adders, an operating mode switch, a gyro-platform tilt angle setting unit and an accelerometer zero offset setting unit. Two electronic level gauges can be installed on the housing of the gravimetric sensor, one of which is oriented along the axis of the pendulums and the other along the axis of rotation of the pendulums. Calibration of the gravimeter is based on measurement of gravimeter readings while varying the tilt angle of the gravimeter. The gyro-platform is switched to electrical arresting mode, wherein the position of the gyro-platform relative to the horizontal is set based on signals from the angle sensors installed on the axes of the gyro-platform, and adjustments are made to the amplifier of the servo system on the roll axis to tilt the gyro-platform by angles corresponding to the change in gravitational acceleration to 4 gal with increment of 500 mgal, each time recording gravimeter readings, after which coefficients of the calibration curve of the gravimeter are calculated from an equation system of the type: b(m-m₀)+a(m-m₀)²=g(cosθ-1), where b is the scaling factor of the gravimeter, mgal/pix, a is the coefficient of the quadratic term of the calibration curve, mgal/pix², g is gravity at the point of calibration, mgal.

EFFECT: invention increases measurement accuracy.

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