傾斜利用ブリルアン光相関領域反射計における歪ダイナミックレンジと空間分解能のトレードオフを明らかにした李(D3)の論文が Measurement Science and Technology に掲載されました。

H. Lee, K. Noda, Y. Mizuno, and K. Nakamura, “Trade-off relation between strain dynamic range and spatial resolution in slope-assisted Brillouin optical correlation-domain reflectometry,” Meas. Sci. Technol., vol. 30, no. 7, 075204 (2019).

Slope-assisted Brillouin optical correlation-domain reflectometry (SA-BOCDR) is one of the high-speed distributed strain sensing techniques, but its strain dynamic range has been limited to approximately 0.15%, which is far from being sufficient for some practical applications. In this paper, we clarify that, unlike widely used time-domain techniques, SA-BOCDR has a trade-off relation between the strain dynamic range and the spatial resolution. This trade-off originates from the unique bell-shaped noise floor inherently involved in the Brillouin gain spectrum observed with correlation-domain techniques. We experimentally show that, at the cost of 3 times lowered spatial resolution, the strain dynamic range of >0.6% can be achieved.