A liquid permeable metallic coating is utilized in conjunction with a fluorescence based optical sensor. The metallic coating is deposited directly on, and is in physical contact with, the sensing membrane. The metallic coating does not require an intervening substrate layer or other components. When...http://www.google.ca/patents/US6207110?utm_source=gb-gplus-sharePatent US6207110 - Metallic overcoating as a light attenuating layer for optical sensors
