SEISMIC RECEIVER Russian patent published in 2023 - IPC G01V1/16 G01V1/18 

FIELD: seismic data recording systems.

SUBSTANCE: seismic receiver contains a housing in which there are three units of microseismic signal receivers (MSR) orthogonally oriented in the X, Y, Z directions. Each MSR unit includes N geophones, which are connected through the corresponding N instrumental amplifiers to an adder connected through a backward filter, consisting of two series-connected bandpass integrators, configured to operate in the frequency band from the lower cutoff frequency ω₁ to geophone natural frequencyω₀, and a high-pass filter with an A/D converter driver connected to a reference voltage source and to an output connector located on the front panel of the case. A damping ratio equal to one is set on each geophone using a shunt resistor R_d connected in parallel with the geophone. Each geophone contains two pull-up resistors R_p, having a resistance value of 100 kΩ, through which the output signals of each geophone are pulled up to ground potential. Each instrumentation amplifier is an ultra-low noise differential amplifier with a gain of 0 dB. The adder is an analog adder on an operational amplifier. The high pass filter consists of two 2nd order Butterworth high pass filters series-connected. The A/D converter driver is a precision, ultra-low distortion driver that converts a single-ended signal to a balanced signal.

EFFECT: enabling registration of weak seismic signals in a large dynamic range by improving the signal-to-noise ratio and attenuating low-frequency noise in the frequency range below the lower cutoff frequency ω₁.

8 cl, 8 dwg