FIG. 1 is a perspective view of an infrared radiation sensor showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a cross-sectional view thereof taken along lines 8--8 of FIG. 3.
The broken lines in the drawings illustrate portions of the infrared radiation sensor that form no part of the claimed design. The oblique line shading in the drawings represents transparent or translucent surfaces. Showing of internal construction is omitted from the cross-sectional view.