Patent ID: 7679736

Claim:
A system for optical photomask inspect through pellicle comprising: a. an optical analyzer for at least one of a reflectance and a transmittance measurement of a photomask and through a pellicle being on said photomask; b. a pellicle correction factor lookup table; c. a pellicle type specific correction factor that is at least one of stored and store able in said pellicle correction factor lookup table, said pellicle correction factor being computed from a first baseline measurement of a reference photomask without a reference pellicle and from a second baseline measurement of at least said reference pellicle; c. a computing subsystem for computationally accessing said pellicle correction factor lookup table such that at least one of said reflectance and transmittance measurement is computationally correctable for pellicle related optical distortions; and wherein said pellicle correction factor lookup table comprises a pellicle type marked bank, and wherein said pellicle type specific correction factor is stored in said pellicle type marked bank.