SEISMOMETER WITH DIGITAL INTEGRATOR Russian patent published in 2002 - IPC

FIELD: measurement of seismic effects. SUBSTANCE: seismometer measuring seismic effects in frequency region below 0.1 Hz has inert mass anchored on base with the aid of two springy members, capacitive displacement transducer connected to input of differential amplifier which output is connected to force transmitter coming in the form of multiple-section coil, digital integrator made of binary and master counters, register of digital-to-analog converter and frequency-pulse modulator whose first input is connected to output of capacitive displacement transducer and whose output is linked via binary counter to first input of register. Outputs of quartz oscillator are connected to second input of frequency- pulse modulator and to second input of register via master counter. Output of register is coupled via digital-to-analog converter to force transmitter of seismometer. EFFECT: expanded range of measurement of seismic effects in region of low frequencies. 1 cl, 1 dwg