UV radiation meter using visible light sensors

Details UV radiation meter using visible light sensors UV radiation meter using visible light sensors

2007-09-18

2007-09-18

Assouad, Patrick (Department: 2809)

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

C250S474100, C356S435000, C356S229000

Reexamination Certificate

active

11280144

ABSTRACT:
An apparatus for quantifying irradiance has a first sensor having an output for providing a reference signal of irradiance within a first band, such as the visible light band. A filter and a second sensor are in optical series so that irradiance sensed at the second sensor is filtered. The second sensor outputs a filtered signal of irradiance within the first band. The filter particularly filters irradiance in the first band as a function of irradiance in the second band, such as the UV light band. In an exemplary embodiment, the filter is made from a material that darkens with increasing UV irradiance. A processor has inputs coupled to the outputs of the first and second sensors for determining irradiance in the second band from the reference signal and the filtered signal. Mathematical formulations for the processor are provided, as are methods and a computer program embodied on a medium. A single sensor embodiment is also described.

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