Light sensor with a photoresistive element having a comb structure

摘要

The light dose received by perishable goods is an important parameter in determining the lifetime of those goods. A light sensor is described having a photosensitive element which changes its material property according to the light dose received. This change can be detected electrically by electrodes in the light sensor. Because the change in material property is permanent, this removes the need for a memory to store a value representing the light dose received by the light sensor.

主权项

1. A light sensor comprising:
a photosensitive element configured to react to exposure to light, resulting in a change in a material property of the photosensitive element; first and second electrodes configured and arranged in a comb structure for measuring a value indicating the material property of the photosensitive element, wherein the value is representative of a light dose received by the photosensitive element and is capacitance of the photosensitive element, and the photosensitive element comprises a photoresist polymer.