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The nitrogen-vacancy (NV) centers in diamond sensing has been considered tobe a promising micro-nano scale thermometer due to its high stability, goodtemperature resolution and integration. In this work, we fabricated the sensingcore by attaching a diamond plate containing NV centers to the section of acut-off multi-mode fiber. Then we measured the zero-field splitting parameter(D) of NV center ensembles using continuous-wave optical detected magneticresonance (CW-ODMR) technique. A home-made thermostatic system and twocalibrated platinum resistance thermometers were applied for referencetemperature measurement. The effects from preparation time and count time inthe pulse sequence, laser power, microwave power, and microwave frequency stepwere investigated. Moreover, the experimental D and T from 298.15 K to 383.15 Kwas obtained with the standard uncertainty of u(D) = (3.62268~8.54464)x10^-5GHz and u(T) = (0.013~ 0.311) K. The experimental results are well consistentwith the work of Toyli, et al. (Toyli, et al., 2012) using the similar diamondsample. The extrapolation for D-T at 0 K and 700 K also agree with otherreferences, and meanwhile dD/dT varies with temperature. Finally, comparing theD-T relationship measured by different research groups, we can know that the NVconcentration resulting in different electron density and manufacturingprocedure resulting in different thermal expansion would lead to different D-Trelationship. It is worthy to continue further comprehensive researchespecially from the metrological point of view to develop NV center as apractical and accurate micro-nano scale thermometry.

Temperature dependence of nitrogen-vacancy center ensembles in diamond based on an optical fiber