The ornamental design for a spectralsensor, as shown and described.
FIG. 1 is a perspective view of the spectral sensor according to the present invention;
FIG. 2 is a top view of the spectral sensor according to the present invention as shown in FIG. 1;
FIG. 3 is a short side view of the spectral sensor according to the present invention as shown in FIG. 1;
FIG. 4 is a short side view of the spectral sensor according to the present invention as shown in FIG. 1, shown from the opposing short side view as that shown in FIG. 3;
FIG. 5 is a long side view of the spectral sensor according to the present invention as shown in FIG. 1;
FIG. 6 is a long side view of the spectral sensor according to the present invention as shown in FIG. 1, shown from the opposing long side view as that shown in FIG. 5; and,
FIG. 7 is a bottom view of the spectral sensor according to the present invention as shown in FIG. 1.
The broken lines depicted in the figures represent the bounds of the claimed design and form no part of the claimed design.