Publications by Suneetha Sebastian

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Owing to their high sensitivity with respect to external measurands, Rayleigh-based distributed optical fiber sensors (DOFS) find their way into applications in many industrial and academic sectors. To further transcend the limit of these sensors in terms ...

In this paper, we report on the comprehensive study on Molybdenum disulfide (MoS2) nanolayer coated etched Fiber Bragg Grating (eFBG) strain sensor. MoS2 nanolayer is coated using Physical Vapor Deposition (PVD) of Molybdenum (Mo) on eFBGs followed by sulf ...

In recent years, numerous measurement techniques have been employed to characterize surface textures in the micrometer and nanometer range. Although these techniques have enabled significant advances in surface metrology, larger surface details are not eas ...

The phase change of back-scattered light due to external perturbations is retrieved in coherent Rayleigh-based distributed sensors by estimating the frequency shift (FS) between the traces of different measurements. The uncertainty associated with the esti ...

Distributed temperature sensing with 10 dB back-reflection-enhanced fiber is performed based on φ-OTDR. While the temperature sensitivity of such fibers is similar to that of standard single-mode fibers, a 3-times higher temperature resolution is observed. ...

An analytical expression to estimate the uncertainty on the frequency shift in ϕ-OTDR systems is established and confirmed by actual data. ...

This paper presents the measurement accuracy of a phase-sensitive optical time-domain reflectometer (ϕ-OTDR) as a function of SNR and pulse width. A method to determine the absolute SNR of a ϕ-OTDR system is also proposed. ...

Suneetha Sebastian

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Enhanced Signal-Associated Noise in a φ-OTDR System

A Study on MoS2 Nanolayer Coated Etched Fiber Bragg Grating Strain Sensor

FBG Tactile Sensor for Surface Thickness and Shape Measurement

On the Measurement Accuracy of Coherent Rayleigh-based Distributed Sensors

Distributed Temperature Sensing Based on φ-OTDR Using Back-reflection-enhanced Fiber

Analytical prediction of the final error due to noise in a ϕ-OTDR system

Determination of the Measurement Accuracy of a Phase-sensitive OTDR