https://ee.iitm.ac.in/optics/ 2026-04-04T20:58:43+0530 https://ee.iitm.ac.in/optics/ https://ee.iitm.ac.in/optics/lib/tpl/starterbootstrap/images/favicon.ico text/html 2019-01-02T11:23:48+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics_backup1:research:metrology:fibre_interferometers&rev=1546408428&do=diff Photonics at IIT Madras Home Academics Research People Publications Contact us All fibre interferometer The all fibre interferometer is unique in its use of multi-wavelength fibre laser, yielding a large dynamic rangeintegrated optoelectronics and signal processingimprovements to the 3 and 4-phase stepping algorithms previously used text/html 2019-01-02T11:23:48+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics_backup1:research:metrology:otdr&rev=1546408428&do=diff Photonics at IIT Madras Home Academics Research People Publications Contact us OTDR The Optical Time Domain Reflectometer is used to measure the loss along a fibre link, and locate discontinuities such as splices and connectors. We have designed multiple versions of the OTDR suitable for text/html 2019-01-02T11:23:48+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics_backup1:research:metrology:viration_sensing&rev=1546408428&do=diff Photonics at IIT Madras Home Academics Research Publications Contact us Vibration sensing Sensitive detection of acoustic emissions at frequencies in the range of kHz-MHz is vital for the health monitoring of mechanical structures. Fiber Bragg gratings (FBGs) are more attractive for such application compared to conventional piezoelectric transducers (PZTs) since they provide wideband response and are amenable to array sensing