METHOD AND DEVICE FOR DETECTING LEAKAGE IN PRESSURE PIPELINE Russian patent published in 2005 - IPC

FIELD: measuring engineering.

SUBSTANCE: device comprises transmitter, two receivers, transmitting aerial, two receiving aerials, phase detector, output voltmeter, synchronizer, time delay unit, switches, oscillator, mixer, amplifier of intermediate frequency, five multipliers, narrow-band filter, amplitude limiter, comparator, and indicator. The method includes comparing the measured value of the phase shift with the reference value of the constant voltage proportional to the measured phase shift, shifting the phase by 90°, multiplying the initial and shifted constant voltage twice, multiplying initial and shifted by 90° constant voltage of the second power with the use of scaling factor K_M = 6, subtracting the voltage obtained from the initial voltage of the fourth power, and summing the voltage obtained and constant voltage of fourth power shifted in phase by 90°.

EFFECT: enhanced sensibility.

2 cl, 1 dwg