Patent ID: 6818904
Filing Date: 2004-11-16
Classification: G01J

Abstract:
An apparatus for detecting cumulative exposure to ultraviolet radiation, comprising:at least one membrane having a curved configuration in its natural state and further having at least a first membrane surface; at least one base member having at least a first base member surface; and at least one degradable bonding means, bonding, along a degradable bonding interface, at least a portion of said first membrane surface to said first base member surface; wherein said degradable bonding means maintains said membrane In a biased state, said biased state created by inverting said curved configuration of said membrane and bonding it to said first base member surface; wherein said degradable bonding means fails upon attaining a predetermined cumulative exposure to ultraviolet radiation; and wherein upon failure of said degradable bonding means, said membrane reflexively restores itself to an unbiased state, to indicate said predetermined cumulative exposure to ultraviolet radiation.