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

FIELD: measurement.

SUBSTANCE: invention relates to seismic detectors. Summary: seismometer includes housing (1), two resilient elements (2) between bracket (3) and housing (1), two magnetic systems (4). Magnetic systems (4) consist of series-connected cylindrical magnetic conductors (5), permanent magnet (6) and pole tip (7). Multi-sectional coil (8) is located between magnetic conductors (5) and pole tips (7) of magnetic systems. Seismometer also includes generator (9) and amplification unit (10). Amplification unit (10) includes serially connected preamplifier (11), demodulator (12) and feedback circuit (13). At that, amplification unit (10) is connected to output contact (14) and connected by its additional output to input of multi-section coil (8). Besides, seismometer includes input contact (15) connected to additional input of multi-section coil (8), transformer (16), first end electrode (17) of capacitive sensor isolated from housing (1) by first dielectric spacer (18), second end electrode (19) of capacitive sensor, isolated from magnetic system (4) by second dielectric spacer (20), third end electrode (21) of capacitive sensor, insulated from magnetic system (4) by third dielectric spacer (22), fourth end electrode (23) of capacitance sensor isolated from housing (1) by fourth dielectric spacer (24), and micromotor (25). At that, amplification unit (10) is made with additional inputs connected to generator (9), transformer (16) is connected to inputs to generator (9), and micromotor (25) is installed on housing (1). Seismometer additionally comprises connected fifth end, sixth, seventh and eighth electrodes (26-29) of capacitance sensor, connected to bracket (3) through fifth, sixth, seventh and eighth dielectric spacers (30-33) respectively. Besides, seismometer includes series-connected spring (34), rod (35) and arrester (36) mechanically connected with micromotor (25). Spring (34) is connected to bracket (3). Output winding of transformer (16) is connected by the first lead to the first and the third end electrodes (17, 21) of the capacitive sensor, the second lead is connected to the second and fourth end electrodes (19, 23) of the capacitive sensor. Input of amplification unit (10) is connected between fifth, sixth, seventh, eighth electrodes (26–29) of capacitance sensor and middle output of transformer (16). Magnetic systems (4) are installed on housing (1) made in form of magnetic shield. Multi-section coil (8) is connected to bracket (3) made of electrically insulating material.

EFFECT: technical result is high accuracy of measuring seismic actions.

1 cl, 1 dwg