Fig. 3: TABS for state imaging of evacuated tube body.
From: High-spatiotemporal-resolution distributed Brillouin sensing with transient acoustic wave
a Conceptional illustration. The sensing fiber is installed on the evacuated tube body in a serpentine manner. The (b) digital photograph and (c) schematic diagram of field test. HS dep.: heat source deployment. Three heat sources (HS1, HS2, and HS3) with individually and periodically varied temperatures are deployed on the evacuated tube body. d Measured sensing information stream (BFS distribution at different times) in the vicinity of evacuated tube located at the end of the 49.25 km long sensing fiber. ∆T temperature variation. e Details of BFS variations at locations 1 and 2 (Loc1 and Loc2) as marked in (d). f Top view of unfolded evacuated tube. Imaged evacuated tube state at 24th min in (g) 2D and (h) 3D views. The area in white dotted box indicates the true location of the preset heat source
