FIELD: deformation detection methods. SUBSTANCE: method consists in determining deformation by measuring clearance between blade and casing. Device contains mirror-reflecting region 1 of coating; optical (3) and current-swirl (9) transducers mounted coaxially in casing 2 of turbo-machine; and treatment and registration schedule. Outer edges of blades are used to form emission stream on them for further direction of stream, using light-conducting system 4, onto mirror-reflecting regions 1 perpendicularly to wheel axis. EFFECT: increased accuracy of determination and reduced effort.
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