SEISMIC SENSOR Russian patent published in 2020 - IPC G01V1/16 G01V1/18 

FIELD: measurement.

SUBSTANCE: invention relates to measurement equipment, in particular to seismometry, and can be used for seismic monitoring. Disclosed is a three-component downhole seismic sensor comprising a pendulum, a spring, an elastic support, a generator, an analogue output, in-series connected capacitance displacement transducer, amplifier, demodulator, feedback unit and magnetoelectric transducer. Pendulum is mechanically connected to the spring, with an elastic support, with a capacitive displacement sensor and with a magnetoelectric transducer, and the capacitive displacement sensor and the demodulator are connected to the generator. Additionally, comprises series-connected constant-domain filter, first comparator with inverse input, first OR circuit and timer, in-series connected second comparator with inverse input and second OR circuit, as well as first, second, third, fourth and fifth inputs, third comparator, fourth comparator, differential amplifier, first two-channel switch connected by inputs to outputs of differential amplifier, inverting amplifier connected by input and output, respectively, to the first and second inputs of the differential amplifier, the second two-channel switch connected by the inputs to the outputs of the first two-channel switch and the micromotor with the drive, mechanically connected to the spring and connected between the outputs of the second two-channel key. Outputs of the second OR circuit and the timer are connected to the control inputs of the second and the first two-channel switches, respectively, the third comparator is connected to the constant-domain filter by the input, and the output is connected to the second input of the first OR circuit, the fourth comparator is connected to the filter with a constant component, and the output is connected to the second input of the second OR circuit. Constant component filter is connected to demodulator input, and its output is connected to first input of differential amplifier and to input of second comparator, analogue output is connected to demodulator output, first, second, fourth and fifth inputs are connected to control inputs of first, second, fourth and third comparators, third input is connected to timer control input, first, second, third and fourth comparators are controlled by actuation thresholds, and timer is controlled by duration of output signal.

EFFECT: technical result is enabling automatic correction of the position of the pendulum when the displacement sensor is unbalanced.

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