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. 2019 Oct 29;10(11):5921–5939. doi: 10.1364/BOE.10.005921

Fig. 5.

Fig. 5.

Schematic of measurement setup for monitoring diffusion of plasticizer between two adjacent TMM layers. A translation stage moves the TMM blocks between the transducer and the hydrophone needle along the x-axis in 1 mm steps. A transmission measurement is recorded at each location.