FIELD: medicine; medical engineering; emergency engineering.
SUBSTANCE: method involves measuring small phase displacements between received harmonic oscillation and reference signal. Device has aerial 1, receiving unit 2, preamplifier, pulsating filter 4, reference signal oscillator 5, AC amplifier 6, phase detector 7, low frequency filter 8, DC amplifier 9, noise background compensation unit 10, threshold element 11, threshold value control unit 12, indicator unit 13, indicator element 14, integrator reset button 15, power supply source 16, phase shifter 17 to 90°, multipliers 18-21, scaling multiplier 22, subtracter 23 and adder 24.
EFFECT: high sensitivity in measuring small phase displacements.
2 cl, 2 dwg
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