WINDOW FOR MULTIWAVE FIBRE DTS WITH PSC FIBRES Russian patent published in 2014 - IPC E21B47/135 G01K11/32 

FIELD: electricity.

SUBSTANCE: method for automated calibration of temperature measurement in hydrogen-rich media with high temperature in the system using a fibre-optic distributed temperature sensor includes the following stages: a. in a measurement mode when flash burn energy of the primary light emission source is delivered to the sensing fibre, and b. in a correction mode when selection of the secondary light emission source is made and pulses of the above secondary source are delivered to the sensing fibre. At that at the first stage backscattered Stokes and anti-Stokes components of Raman emission are collected and temperature values are calculated using intensities of the backscattered Stokes and anti-Stokes components of Raman emission. At the second stage the backscattered Stokes and anti-Stokes components of Raman emission are collected from the secondary light emission source; this Stokes component of Raman emission is used for correction of a profile for anti-Stokes component of Raman emission collected from the primary light emission source during the measurement mode; corrected temperature value is calculated based on the corrected profile of anti-Stokes component of Raman emission. At that the used distributed temperature sensor is an optical fibre with a pure silicate core (PSC). At that the primary light emission source is a source with a wave length of 1,064 nm and the secondary light emission source is a source with a wave length of 980 nm.

EFFECT: ensuring potential operation of the fibre-optic sensor in conditions with higher temperature and increase of its operational reliability during the whole service life of this sensor.

3 cl, 7 dwg