両方向から測定した周波数シフト分布の統合によるブリルアン光相関領域反射計の誤差低減法を提案した東京工業大学・横浜国立大学との共同研究の成果が Applied Physics Express に受理されました。
G. Zhu, K. Noda, H. Lee, K. Nakamura, and Y. Mizuno, “Error compensation in Brillouin optical correlation-domain reflectometry by combining bidirectionally measured frequency shift distributions,” Appl. Phys. Express, vol. 14, no. 5, 052006 (2021).
We put forward a new theory on Brillouin optical correlation-domain reflectometry (BOCDR) based on arbitrary waveform modulation. We derive a universal representation for the spatial resolution using the foot convexity of the beat spectrum. This result well explains the previous results based on sinusoidal modulation, and thus our theory is the consistent extension of the conventional theory on BOCDR. This representation is also applicable to the spatial resolution evaluation of more complicated modulation schemes, such as the combined use of intensity and frequency modulations even with some phase delay. We also discuss what kinds of modulation waveforms should not be employed for distributed measurement to ensure high spatial resolution.