In cases, when it is necessary to know the temperature in
exactly determined places, the resolution of optical fiber
DTS seems to be a big problem. The resolution of DTS is
in the range from 1 to 2 m according to system
configuration. The resolution of DTS is described by
situation, when in the same part of optical fiber (z) the
temperature grows up to 40 °C against ambient
temperature 25 °C or 26 °C. In place with increased
temperature (z ± resolution) the system is unable to
localize other temperature change if it does not exceed
mentioned temperature. The challenge of experimental
measurement was to set the ideal size of sensory ring for
optical fiber with primary coating (external diameter of
250 µm) and optical fiber with tight outer jacket (external
diameter of 900 µm). The example of optical meander in
point mode (matrix type) is shown on Fig. 5.