Fig. 5: Measurement of the acoustic stealth property at 100 kHz.
From: Magnetic–acoustic biphysical invisible coats for underwater objects
a Schematic of the experimental setup for acoustic measurement in a water tank. A transducer will launch longitudinal acoustic waves and receive the reflected waves. The distance from the transducer to the sample is set to 150 mm. The operation frequency is 100 kHz, depending on the choice of emitter. The inset presents pictures of two samples: Sample 1—plate (left) and Sample 2—cylinder (right). b, c The measured time-trace ultrasonic signal for the plate and cylinder sample, respectively, with (red) and without the absorber (black). RS and RW represent the reflections from the sample and tank wall, respectively, as indicated in a.
