  Nitrogen-vacancy (NV) center in diamond was found to be a powerful tool for
various sensing applications. The main work horse of this center so far has
been optically detected electron resonance. Utilization of the nuclear spin has
the potential of significantly improving sensitivity in rotation and magnetic
field sensors. Ensemble-based sensors consume quite a bit of power, thus
requiring an understanding of temperature-related shifts. In this article, we
provide a detailed study of the temperature shift of the hyperfine components
of the NV center.
