Figure 9.

Tissue penetration experiments for SSN

(A) CCD images for SSN (Sr₃Sn₂O₇:Nd³⁺) pellet set.

(B) Sequence of images recorded using an InGaAs-CCD camera for SSN applied during the load cycle of 350 N at a rate of 3 mm min-1 showing the real-time images of NIR light distribution.

(C) The distribution along vertical component of the NIR piezoluminescence in the SSN pellet with and without a chicken skin under a compressive load of 77 N.

(D) CCD image for Sr₃Sn₂O₇:Nd³⁺ (SSN) flm.

(E) Images recorded with an InGaAs-CCD camera for SSN flm by tensile load applied (nominal strain: 600 μst).

(F) The distribution at the horizontal position along the center of a circular hole of the NIR piezoluminescence of the SSN flm outside and embedded 5 mm in a sample of pork under a tensile load (maximum of nominal strain: 600 μst). Reproduced with permission from (Tu et al., 2020). Copyright 2020 WILEY.