Sensors and methods for determining whether an item has been...

Details Sensors and methods for determining whether an item has been... Sensors and methods for determining whether an item has been...

G - Physics

01

J

G01J 1/50 (2006.01) G01J 5/00 (2006.01) C09K 9/00 (2006.01)

Patent

CA 2714321

A method for determining whether an item has been exposed to an environmental condition during a monitoring period. The method includes placing a sensor at least in proximity to the item at the beginning of the monitoring period so that the sensor will be exposed to a level of an environmental condition that can be correlated to an exposure level of the item to the environmental condition; reading the sensor; and determining from reading the sensor whether the item has been exposed to the environmental condition. The sensor includes a detecting material comprising a photochromic or photothermochromic material, the detecting material selected so that upon exposure to the environmental condition the detecting material exhibits a detectable color change.

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