From these results it can be clearly seen that the
ideal length of optical fiber in sensory ring is 3 m in case
of optical fiber with tight outer jacket. The measured
values on Fig. 11 are not exact on level of 40 °C
(40,5 °C). It is caused by inertia of Memmert in an
endeavor to keep the temperature of the water bath on
level 40 °C.