Abstract:
A nucleonic gauge for use with moving strip or web material in which oil particles or oil mist is entrained with the web. The nucleonic gauge incorporates protector plates, there being one plate associated with the source housing and another plate associated with the detector housing. Each plate includes air passageways through which air is directed under pressure at a region closely adjacent the source window and the detector window for preventing the occurrence of oil droplets or other foreign material on these windows. The plates further provide mechanical protection against window damage in the event that there is a break in the sheet material.