DEVICE TO MEASURE INFRASONIC MEDIUM OSCILLATIONS Russian patent published in 2013 - IPC G01H11/00 

FIELD: measurement equipment.

SUBSTANCE: device for measurement of infrasonic medium oscillations, comprising an acoustic filter in the form of N sections (N≥1), connected to a body, a sensitive element connected to environment and a medium inside the body, serially connected a sensitive element, a sensor of sensitive element displacement, a band amplifier, and a demodulator connected to an analogue output of the device, and also a generator connected to the sensor of sensitive element displacement and the demodulator, additionally comprises serially connected an analogue-to-digital converter, a microprocessor with a digital port, a digital-to-analogue converter, the first switch, a summator, the first amplifier and the first converter of an electric signal into mechanical oscillations, connected with the sensitive element, a filter connected with the input to the demodulator, and with the output - to the second input of the summator, and for each of N sections - serially connected (N+1) a switch, (N+1) an amplifier and (N+1) a converter of an electric signal into mechanical oscillations, installed at the input into the N section, besides, the input of the analogue-to-digital converter is connected to the demodulator, inputs of switches are connected to the digital-to-analogue converter, and with control inputs the switches are connected to a microprocessor.

EFFECT: increased accuracy of measurement.

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