A resin impregnated amount measuring method and device for accurately and successively measuring an amount of resin impregnated in a fiber in a filament winding molding. Each respective surface feature consists of a bump on, or recess in, a surface of the object. That new heap may be added to the pool of heaps from which an allocation may be made. The output-stage circuit is coupled to the floating current mirror circuit, and produces a driving signal according to the mirror current.