Electro-optical method and system especially suited for remote meter reading

摘要: Coded cylindrical drums mounted on the pointers of dials a meter are provided with parallel axially aligned rows data elements constituted by opaque and transparent areas. Each is centrally located ring to rows. Light transmitted diametrally through thereby intersecting same at two places. So that light will scan as they brought into position so can escape ring, converged spaced orthogonally related lines for each drum. This accomplished passing positive aspherical or spherical lens in series. The respectively shortened focal length due added power lens' normal length. difference lengths corresponds drum diameter. A masking arrangement be utilized expose sequence reduce photoelectric necessary pickup. provide synchronization pulses identify elements. transponder transmits collected remote central station.