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Science & Tech.
Pradeep Kumar

14/03/21 11:46 AM IST

Optical fiber to determine power line health

In news

Researchers at IIT Madras have demonstrated that by using Raman thermometry on fibre optic cables, they can achieve monitoring of power transmission cables

Finding
  • They achieve this by using the optical fibres that are already embedded in the power cables for establishing optical communication.
  • This could cost up to 80% of the total expense in setting up the communication system.
  • Optical fibre-embedded power cables are already available across the country, but none of them are presently used for power monitoring.
  • Researchers are presently working with a leading Indian power transmission and distribution company for implementing this technology.
  • The team is exploring machine learning techniques to identify hotspots along the length of the cable with high accuracy.
Raman Effect
  • India’s first and so far only Nobel laureate in physics, C.V. Raman, won the prize for his discovery of Raman effect.
  • This consisted of experimental observations on scattering of light.
  • In the Raman effect, when light is scattered off an object, say a molecule, two bands are observed, with higher and lower frequency than the original light, called the Stokes and anti-Stokes bands, respectively.
  • By studying the relative intensity of the two bands, it is possible to estimate the temperature of the object that scattered the light.
  • The anti-Stokes component of Raman scattering is strongly dependent on the temperature that the material is subjected to.
  • Thus, by measuring the intensity of the anti-Stokes scattered light we can estimate the temperature. This is Raman thermometry
Source: The Hindu

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