scope:

This part of IEC 61757 defines detail specifications for distributed temperature measurement 130 by a fibre optic sensor, also known as fibre optic distributed temperature sensing (DTS). DTS 131 includes the use of Raman scattering, Brillouin scattering and Rayleigh scattering effects. In 132 addition, Raman scattering and Rayleigh scattering based measurements are performed with 133 a single-ended fibre configuration only. Brillouin scattering based measurements are per134 formed with a single-ended fibre or fibre loop configuration. The technique accessible from 135 both sides at same time (e. g. Brillouin optical time domain analysis, BOTDA) is referred to 136 here as a loop configuration. Generic specifications for fibre optic sensors are defined in IEC 137 61757-1.