Hello All My company has several products that use an IR emitter & receiver in line and are used as a sensor to detect when something 'breaks the beam'. The problem we are running into is that several of these components are aging prematurely, but they work perfectly at the time of our products' manufacturing. Does anybody know of any good ways to screen for this premature component degradation at an incoming material level? I've already changed all the manufacturing processes to prevent the parts from taking damage during assembly (removed thermal and mechanical stresses). Otherwise, I don't know any good ways to check for this - looking for parts that will fail down the road, but currently work.