DIGITAL SEISMOMETER Russian patent published in 2023 - IPC G01V1/16 G01V1/18 

FIELD: seismic data recording systems.

SUBSTANCE: digital seismometer includes a series-connected seismic receiver, a microseismic signals control and registration unit (MSCRU), a processor unit (OU) placed in a single housing. The 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 frequency ω₀, and a high-pass filter (HPF) with an A/D converter (ADC) driver connected to a reference voltage source. The MSCRU comprises an ADC unit connected to a reference voltage unit. The ADC block comprises three ADC microcircuits, each of which receives an analogue signal from the corresponding geophones and is connected through a digital data bus isolator (DDBI) and a multiplexer to a control microcontroller connected to the DDBI, a GPS / GLONASS receiver connected to an active antenna, and a clock signal generator. The PU is a single-board computer connected to a MSCRU microcontroller. The single board computer has a memory card, USB ports, a Bluetooth module, a Wi-Fi module, and an RJ-45 connector for a Gigabit Ethernet network transceiver. The front panel of the housing comprises an active GPS/GLONASS antenna, USB ports, an RJ-45 connector, a connector for connecting a power source and a bubble horizon level, LEDs for indicating the operating mode of a digital seismometer, and a Start/Stop button connected to the control microcontroller. The HPF consists of two 2nd order Butterworth HPFs connected in series. The A/D converter driver is a precision, ultra-low distortion driver that converts a single-ended signal to a balanced signal.

EFFECT: improving the accuracy and reliability of determining the arrival direction of a seismic wave and reducing errors in determining the coordinates of the hypocentres of seismic events.

6 cl, 8 dwg