Arc detector for waveguide system

Claim 1

APPARATUS FOR DETECTING ARCS IN A WAVEGUIDE SYSTEM, COMPRISING A WAVEGUIDE SECTION HAVING A CONDUCTIVE WALL PROVIDED WITH AN APERTURE, AN OPTICALLY TRANSPARENT ROD EXTENDING FROM THE EXTERIOR OF SAID WAVEGUIDE SECTION THROUGH SAID APERTURE AND INTO THE INTERIOR OF SAID WAVEGUIDE SECTION, THE PORTION OF SAID ROD WITHIN SAID WAVEGUIDE SECTION HAVING A LIGHT COLLECTING SURFACE THAT HAS AT LEAST A PORTION THEREOF INCLINED WITH RESPECT TO THE LONGITUDINAL AXIS OF THE WAVEGUIDE SECTION TO COLLECT LIGHT TRAVELING WITHIN SAID WAVEGUIDE AND REDIRECT IT TRANSVERSELY THROUGH SAID APERTURE, THE SIZE OF SAID APERTURE AND THE PROJECTION OF SAID ROD INTO SAID INTERIOR BEING SUCH AS TO PRODUCE SUBSTANTIALLY INAPPRECIABLE PERTURBATION IN THE WAVE TRANSMISSION CHARACTERISTICS OF SAID WAVEGUIDE SECTION, AND A PHOTOELECTRIC CELL ADJACENT THE END OF SAID TRANSPARENT ROD OUTSIDE SAID WAVEGUIDE SECTION AND POSITIONED TO RECEIVE SAID TRANSVERSELY DIRECTED LIGHT.