FIELD: physics.
SUBSTANCE: vertical acceleration of a pantograph is calculated in the processing portion (2) of an image taken by a camera (1). The image processing portion (2) comprises an image input portion (21) for inputting an image of the pantograph photographed by the line sensor camera (1) at a measuring point of the pantograph, a pantograph position detecting portion (23) for detecting a position of the pantograph displayed by the camera (1), and a pantograph vertical acceleration measuring portion (24) at a point for contacting the pantograph with a trolled wire based on one or more transfer functions previously obtained and a displacement of the pantograph.
EFFECT: invention increases compactness of the device.
5 cl, 6 dwg
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