Table 2.

Summary of the usage effects that different fiber optic sensors can achieve

Domain feature	Sensor	Monitoring Process	Principle	Function	Refs.
Element	FOEW	Observing the oxidation–reduction of elements	Change in light signal intensity	Understanding the redox process of elements and its accompanying processes	[41]
Interface	SPR	Observing the particle concentration at the interface	Changes in light intensity of SPR mode	Understanding interface electrical properties	[45]
Domain	TFBG	Observing the turbidity level of electrolyte	Changes in light intensity of guided cladding mode	Understanding the evolution of electrolyte domain performance	[49]
Macro: Point to Line (Adding a time dimension can transform single measurement point information into line information)	FBG	Observing the transverse and longitudinal bidirectional stress inside the battery; Observing oxidation–reduction temperature rise	FBG reflection peak splitting and displacement	Understanding the characteristics of charge and matter transport	[99]
Macro: Line to Surface (Adding a time dimension can transform the information along the optical fiber into surface information)	Rayleigh Scattering sensor	Observing global force and heat	Rayleigh scattering spectral shift	Understanding global force and thermal evolution	[85]