Technical notes


Brillouin Sensing Technique

How does Brillouin distributed sensing work ?

The phenomenon used to measure temperature or strain in a fiber optic relies on the interaction between a laser light and the glass material in an optical fiber. When light travels through a transparent media, the most part of it travels straight forward, as a small fraction is back scattered. Different components of the back scattered light can be identified.

DITEST BOTDA scattering spectra with Rayleigh, Brillouin and Raman

The Omnisens DiTeSt exploits the sensitivity of the Brillouin frequency shift for temperature and strain sensing applications. The technique uses standard low-loss single-mode optical fibre offering the longest distance range with unrivalled performances and a compatibility with standard telecommunication components.

brillouin shift

Stimulated Brillouin scattering

Brillouin scattering can be optically stimulated leading to the greatest intensity of the scattering mechanism and consequently an improved signal-to-noise ratio. Brillouin frequency-based technique is opposed to intensity based techniques such as Raman and is inherently more accurate and more stable in the long term, since intensity-based techniques suffer from a high sensitivity to drifts.

Omnisens DITEST uses Stimulated Brillouin Scattering and is especially suited for applications requiring speed, distrance or higher optical budget.