קולוקוויום: Colloquium: Fiber-optic Distributed and Quasi-Distributed Acoustic Sensing (DAS and Q-DAS) by Avishay Eyal

Electrical Engineering Colloquium 

Speaker: Prof. Avishay Eyal

Title: Fiber-optic Distributed and Quasi-Distributed Acoustic Sensing (DAS and Q-DAS)

Abstract 

An optical fiber can be described as a glass pipeline which can guide light over great distances with very little loss. In addition to being the central communication channel of the information era, it has another very interesting application. This application is called distributed sensing. By launching into the fiber specially designed pulse sequences of light and analyzing their reflections from different positions along the fiber, it is possible to measure various physical parameters such as temperature, strain and acoustic signals at these positions. During recent years the use of fiber-optic Distributed Acoustic Sensing (DAS) or Quasi Distributed Acoustic Sensing (Q-DAS) systems has become ubiquitous for a variety of applications. Distributed optical fiber sensors are particularly attractive for marine applications. Facilitating long haul sensing or communications systems in the underwater arena is challenging not only due to the need for underwater compatible sensors but also since conventional wireless communication techniques cannot be used to transmit the measured signals. Distributed fiber-optic sensors perform both tasks with the same medium. In the colloquium I will describe techniques that we have developed in our lab for increasing the bandwidth and sensitivity of DAS and Q-DAS systems and will present results of underwater sensing and underwater acoustic communications.

Light refreshments will be served before the lecture

This colloquium is not counted toward seminar credit.

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