The reticle is not firmly fastened inside the EUV pod. So, during transport and handling, the EUV pod and subjected to vibrations. This can damage thin film coatings and pollute the EUV mask. In this situation, a SEBS (smart EUV blank sensor) is very useful. A SEBS comes with a group of specialized sensors such as vibration, level, and temperature to improve the vibration during transport and handling of the EUV mask blank.
|