Optical Sensing System
Original Publication Date: 1988-Jul-01
Included in the Prior Art Database: 2005-Feb-15
A technique is described whereby an optical sensing system is used to verify hole pattern integrity, as used in the manufacture of multilayer ceramic substrates. The system operates, in real time, as holes are being punched by a high-speed punching machine. The concept is an improvement over prior techniques which required manual inspection of the hole patterns. The optical sensing system consists of five major components, as shown in the Fig. 1: Optical fibers 1, transmitter 2, receiver 3, signal processor 4 and a counter (not shown). Each optical fiber 1 is a single strand of fiber-optic material. One end of the strand is cemented into needle tubing, as shown in the exploded view. The other end of the strand is connected to a connector.