FIELD: testing equipment. SUBSTANCE: flaw detector has movable split section 1 and fixed split section 2 enclosing rope 3. Carrier 10 is rigidly fixed on outer bushing 7 of movable split section 1. Carrier mounts laser 11, electric motor 12 and rope angular travel transmitter 14. Bracket 16 is fastened on fixed split section 2. Light filter 17 and receiver 18 are installed on bracket. Electric motor 12 and angular travel transmitter 14 are connected with sun gear 9 by planetary gear train 13. Two bars 21 with photocells are mounted on receiver 18. Electric motor 12 is electrically coupled with each bar 21 through power amplifier 27, comparator 26 and voltage amplifier 25. EFFECT: enlarged range of torsional strain measurements, prevention of influence of fixed rope sag on value of measured torsional strain. 5 dwg
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