Fig. 4: TABS for state imaging of linear synchronous motor.
From: High-spatiotemporal-resolution distributed Brillouin sensing with transient acoustic wave
a Conceptional illustration. The right inset illustrates the primary windings (key device for vehicle traction) arranged in a serpentine manner. The sensing fiber could be embedded into the primary windings for precise temperature-rise imaging. b Sectional view of ETT maglev system. LSM-PW: linear synchronous motor’s primary windings, HTSB: high-temperature superconducting bulk, PMG: permanent magnetic guideway. The (c) digital photograph and (d) schematic diagram of field test. The sensing fiber cable is installed on the mimic LSM in a serpentine manner. Two heat sources (HS1 and HS2) are deployed on the backside of the side where the sensing fiber cables are installed. e Measured sensing information stream (BFS distributions at different times) in the vicinity of mimic ETT located at the end of the 50 km long sensing fiber. The area in white dotted box indicates the fiber BFS variation induced by the temperature rise. Imaged LSM state at f 17.5th min and g 38.5th min. The area in black dotted box indicates the true location of the preset heat source
