FIELD: railway and city transport. SUBSTANCE: condition of contact wire is checked by recording dynamic of deformation of wire in operation by means of optical device when vehicle is moving. Optical device has base with optical system consisting of six pickups and secured on current collector. Pickups are arranged along axis of contact wire and form small divergence beams. Optical device has also receivers taking up light radiation in which signal is arranged proportional to linear displacements in zone of illumination formed by radiator beam when vehicle passes along wire. Radiators and receivers are placed at distance of cross gab of wire. EFFECT: provision of automatic examination of contact wire state. 3 cl, 5 dwg
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