FIG. 1 is a front elevational view of a surveillance sensor according to a first embodiment of my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a perspective view thereof;
FIG. 8 is a front elevational view of a surveillance sensor according to a second embodiment of my new design;
FIG. 9 is a rear elevational view thereof;
FIG. 10 is a left side elevational view thereof;
FIG. 11 is a right side elevational view thereof;
FIG. 12 is a top plan view thereof;
FIG. 13 is a bottom plan view thereof; and,
FIG. 14 is a perspective view thereof.
Portions of the surveillance sensor shown in broken lines from no part of the claimed design.