Fig. 3: Correlation between the differential optical power evolution d(dB)/dt and the temporal potential.
From: Operando monitoring of ion activities in aqueous batteries with plasmonic fiber-optic sensors

a Real time response of GCD curve (red), optical power level in dB (black), and d(dB)/dt (blue). b The relationship curve between the optical signal d(dB)/dt and the potential: each trace follows the simultaneous values of the two parameters as a function of time.