Dear MEMS colleagues. I am curious to find a way to monitor the etch rate of my sample inside an RIE machine. Now I have heard of CCDs (used for SEM), but I am not sure whether the plasma inside the chamber and the gases would affect the CCD. Does anybody know what would happen if a CCD is placed in plasma? Regards. Ghazal Hakemi PhD student Cranfield University MK43 0AL U.K.