Abstract: A fiber optic cable for connecting at least one optical transmitter to at least one optical sensor in an electronic assembly, the fiber optic cable comprising: a first surface layer; a second surface layer, the first and second surface layers being in stacked parallel plane relation; a resin layer, the first surface layer and the second surface layer being bonded together by the resin layer; at least one fiber optic filament, each fiber optic filament being embedded in the resin layer in a predetermined pattern; means for terminating each respective fiber optic filament to facilitate optically coupling each respective optical transmitter to a respective optical sensor; the first surface layer, the second surface layer, the resin layer and the fiber optic filament being laminated forming a relatively flat ribbon cable having a cross section relatively free of voids; whereby the fiber optic cable is formed as a relatively thin, flexible, flat layer facilitating installation in an electronic assembly.

Abstract: Instrument for the non-destructive detection of contamination on the surface of a metallic object. A reference electrode contains sufficient radioactive material to ionize the air in a gap between the electrode and the metallic object. A buffer amplifier has its input terminals connected to sense the surface potential difference between the electrode and the metallic object. The air gap is typically from one to ten millimeters wide. The input circuit of the buffer amplifier has a resistance very much larger than that of the air gap when the air is ionized. The buffer amplifier drives an alarm device or a display device. A single voltage pick-up is conveniently embodied in a portable hand-held probe. A plurality of voltage pick-ups is incorporated into an array for simultaneously making multiple measurements of surface condition over a large area.