METHOD OF MEASURING TEMPERATURE DISTRIBUTION IN OBJECT AND DEVICE THEREFOR Russian patent published in 2016 - IPC G01K11/32 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to thermometry and can be used to solve wide range of tasks in oil and gas industry. Sensitive optical fibre is placed in thermal contact with object, reflectometric measuring circuit is arranged containing optical path of back-scattered radiation. Optical path of back-scattered radiation is connected through optical filter made with possibility of selection of back-scattered anti-Stokes Raman signal to photo receiver. Optical pulses are generated and brought into sensitive optical fibre. One performs photo reception, digitisation and digital signal accumulation of back-scattered anti-Stokes Raman emission to achieve specified signal/noise ratio. Then optical path of back-scattered radiation is connected through optical filter made with possibility of selection of back-scattered reference signal of Stokes Raman or Rayleigh radiation to photo receiver. Optical pulses are generated and brought into sensitive optical fibre. One performs photo reception, digitisation and digital accumulation of back-scattered reference signal of Stokes Raman or Rayleigh radiation to achieve given signal/noise ratio. Temperature distribution in object is determined by calculation based on ratio of back scattered signal of anti-Stokes Raman emission and reference signal of Stokes Raman or Rayleigh radiation, then obtained result is archived backup or transferred to outside. Also disclosed device for implementing said method of determining temperature distribution in object.

EFFECT: reduced effect on measurement accuracy differences of characteristics of two photodetector channels at sufficient for registration of power level of two received signals, measuring and reference.

6 cl, 1 dwg