Fig. 3: Signal preprocessing of BTS.

a Cross section structure of the DTS. b Ideal curves of current and displacement in different channels. c Ideal curves of current and displacement for materials to be identified with different hardness. d Decoupling mechanism of two signals in DTS. The ideal IV curve for both stimulus signals: e temperature difference and g stress. f The IV curves of DTS under different temperature differences. h The IV curves of DTS under different stress.