Patent ID: 6278120
Filing Date: 2001-08-21
Classification: G01J

Abstract:
A UV sensor which eliminates solarization effects on optical components of the sensor comprising:a housing having cavity opening to a first end of the housing and a viewing port opening to a second end of the housing to receive incident radiation and communicating the incident radiation to the cavity;a first UV transmitting, extremely low solarization window positioned in the cavity to receive incident radiation, a back surface of the first window being frosted to produce diffusion of UV rays in the incident radiation;an aperture plate within the cavity having a small aperture for passing only a small amount of the diffused UV rays from the first window;a second UV transmitting, extremely low solarization window positioned within the cavity to receive the diffused UV rays passed by the aperture, aback surface of the second window being frosted to produce diffusion of UV rays passed by the aperture;a UV filter positioned in the cavity to receive diffused UV rays from the second window, said UV filter passing only radiation in a frequency band of interest; anda photodetector positioned to receive radiation passed by the UV filter.