OPTICAL FIBRE SENSOR 2

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Slide 1:

Fiber optic sensor CONTENT DEFINATION OF FIBRE OPTIC SENSOR APPEARANCE OF FIBRE OPTIC SENSOR APPLICATION AREAS SUPPORTING TECHNOLOGY TYPES OF SENSOR

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FIBRE OPTIC SENSOR? A fiber optic sensor is a sensor that uses optical fiber either as the sensing element ("intrinsic sensors"), or as a means of relaying signals from a remote sensor to the electronics that process the signals ("extrinsic sensors")

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GEOGRAPHICAL ORIGIN OF OPTICAL SENSOR PATENTS

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GENERAL USES OF FOS Measurement of physical properties such as strain, temperature, displacement Monitoring the physical health of structures in real time Damage detection MONITORING IN STRUCTURAL ENGINEERING Building & Bridge: Concrete monitoring during setting, crack monitoring, long term deformation monitoring. Tunnel: Multipoint optical extensometer and joint monitoring damage detection Dams : foundation monitoring, joint expansion monitoring, distributed temperature monitoring Heritage structures: Displacement monitoring, crack opening analysis, post-seismic damage evolution, restoration monitoring.

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SUPPORTING TECHNOLOGY : KAPRON demonstrated that the attenuation of light in silica fiber is low enough so long distance transmission is possible. PROCEDURE IN FIBRE OPTIC SYSTEM: Transmit light from a light source along optical fiber to a sensor which changes of a desired environmental parameter . The sensor modulates the characteristics (intensity, wavelength, amplitude, and phase) of the light. The modulated light transmitted from sensor to signal processor and converted into a signal that is processed in control system . The properties of light involved in fiber optic sensors: reflection, refr action, interference and grating

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CLASSIFICATION (contd.) EXTRINSIC SENSORS WHERE THE LIGHT LEAVES THE FEED OR TRANSMITTING FIBER TO BE CHANGED BEFORE IT CONTINUES TO THE DETECTOR BY MEANS OF THE RETURN OR RECEIVING FIBER

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INTRINSIC SENSORS INTRINSIC SENSORS ARE DIFFERENT IN THAT THE LIGHT BEAM DOES NOT LEAVE THE OPTICAL FIBER BUT IS CHANGED WHILST STILL CONTAINED WITHIN IT . ACCORDING TO THE CHARACTERISTICS OF LIGHT MODULATED BY ENVIORONMENTAL EFFECT

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INTENSITY BASED FIBRE OPTIC SENSOR SPECTRAL BASED FIBRE OPTIC SENSOR

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ADVANTAGES OF FIBRE OPTIC SENSORS: Immunity to electromagnetic interference (EMI) OR Radio frequency interference (RFI). All passive dielectric : elimination of conductive path in high voltage environments Inherent safety and suitability for extreme vibration and explosive environments Tolerant of high temperature (>1450C) and corrosive environment Light weight and small size High sensitivity

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RECENT DEVELOPMENT: SUNX Sensors (West Des Moines, IA), Omron, Keyence Corp, have begun to respond by introducing new waves of fiber-optic sensors . These companies now offer fiber-optic amplifiers (remote sensors) with easy-to-read digital LEDs. Some of these new sensors also need significantly less wiring . For instance, there are configurations in which 16 sensors are connected and share a single power line . New dual-output fiber-optic sensors offer the performance of two sensors in one package. Certain models offer either two independent digital outputs or a combination of analog and digital output. Most of these sensors now incorporate either a 12-bit or 16-bit CPU as well as 12-bit A/D converter that provides both higher resolution and faster response time, in some cases as fast as 20 µs With all the flexibility and benefits that fiber-optic sensor systems provide, it is no wonder that they are becoming more widely used .

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CONCLUSIONS LOOKING AT THE INDUSTRY TRENDS IN THE PAST 2 DECADES AND THE EXPONENTIAL CURVE IT SEEMS TO ME THAT THERE IS GOING TO BE A LOT OF RESEARCH AND IMPROVEMENTS TO THE EXISTING SENSORS OPTICAL SENSORS ARE HERE TO STAY !!!!

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QUESTIONS ??

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REFERENCES Optical Sensor Technologies www.wtec.org/loyola/opto/c6_s3.html Measuring with LIGHT www.sensorsmag.com/articles/0500/26main.html Optical Fiber Sensors www.ul.ie/elements/Issue6/Optical%20Fibre%20Sensors.html e DetectiPartial Dischargon http://www.photonics.com/spectra/applications/XQ/ASP/aoaid.328/placement.HomeIndex/QX/read.html Military and Law Enforcement http://www.militaryandlaw.com.au/products/l3vision.php

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THANK YOU FOR YOUR PATIENCE AND TIME

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