Optical radiation sensor system having a radiation window with a non-circular opening

An optical radiation sensor device for detecting radiation in a radiation field, the device comprising:

• a sensor element capable of detecting and responding to incident radiation from the radiation field;
• and
• a radiation window interposed between the sensor element and the radiation field, the radiation window comprising a plurality of non-circular shaped radiation transparent openings arranged serially with respect to the sensor element;
• wherein:
• (i) the relative spacing between the first non-circular shaped radiation transparent opening, the second non-circular shaped radiation transparent opening and the sensor element, and (ii) the relative dimension of the first non-circular shaped radiation transparent opening and the second non-circular shaped radiation transparent opening, are chosen to define a cosine response of greater than ±1° with respect to the concentric axis.

An optical radiation sensor device for detecting radiation in a radiation field, the device comprising;

• a sensor element capable of detecting and responding to incident radiation from the radiation field;
• and
• a radiation window interposed between the sensor element and the radiation field, the radiation window comprising a first non-circular shaped radiation transparent opening interposed between (i) a second non-circular shaped radiation transparent opening and (ii) the sensor element, the first non-circular shaped radiation transparent opening, the second non-circular shaped radiation transparent opening, and the sensor element being aligned substantially with respect to a concentric axis;
• wherein:
• (i) the relative spacing between the first non-circular shaped radiation transparent opening, the second non-circular shaped radiation transparent opening and the sensor element, and (ii) the relative dimension of the first non-circular shaped radiation transparent opening and the second non-circular shaped radiation transparent opening, are chosen to define a cosine response of greater than with respect to the concentric axis.