As the water column rises, the grooves are successively
filled and the transmitted signal optical power increases.
The sensitivity of sensor 1, in this case by linear fit to the
data of Fig. 6, is an increase of 0.74 ± 0.01%/cm
(1.44%/groove) of its initial value.
The sensitivities of the implemented sensors are presented
on Table 3, through the fitting to the experimental
data represented on Fig. 6. The sensitivities value corresponds
to the increase in the optical signal measured at
the POF output, relatively to the initial measurement,
without any groove fulfilled.