FIELD: oil extracting industry. SUBSTANCE: sensor has upper and lower bushes located coaxially to sensor's body. Butts of bushes are made as half-rings. Lower half-ring of upper bush and upper half-ring of lower bush are linked to each other by semibush along inner diameter of half-ring. Shaft-modulator is made in the form of two halves of cylindrical pipes in series linked to each other by connecting semibush. Butts of halves of cylindrical pipes along generatrix are covered by half-rings with similar dimensions of half-rings of bushes. EFFECT: increased measurement accuracy due to increase of signal to noise ratio by broadening turbodrill generated acoustic vibrations frequency range of absorption. 5 dwg
