OPTICAL SENSORS AND THEIR APPLICATIONS
#1


PRESENTED BY
GAURAV PURI

[attachment=11530]
OPTICAL SENSORS AND THEIR APPLICATIONS
INTRODUCTION

 NEW REVOLUTION OF OPTICAL FIBER SENSORS
 IT IS A “SPIN-OFF” FROM OTHER OPTICAL TECHNOLOGIES
 SEEING THE POTENTIAL IN SENSING APPLICATIONS – DEVELOPED AS ITS OWN FIELD
 WHY OPTICAL SENSORS
 ELECTROMAGNETIC IMMUNITY
 ELECTRICAL ISOLATION
 COMPACT AND LIGHT
 BOTH POINT AND DISTRIBUTED CONFIGURATION
 WIDE DYNAMIC RANGE
 AMENABLE TO MULTIPLEXING
 WORKING PRINCIPLE
 SENSING DETAILS
EP(t)cos[ωt+θ(t)]
• INTENSITY BASED SENSORS – EP (t)
• FREQUENCY VARYING SENSORS - ωP(t)
• PHASE MODULATING SENSING- θ(t)
POLARIZATION MODULATING FIBER SENSING
 CLASSIFICATION
 EXTRINSIC SENSORS
 CLASSIFICATION (contd.)
 INTRINSIC SENSORS
 COMPARISON OF THE TWO TYPES
 SENSOR TYPES
CHEMICAL SENSORS
 REMOTE SPECTROSCOPY
 GROUNDWATER AND SOIL CONTAMINATION
 MAJOR PLAYERS IN CHEMICAL SENSORS
1) PHARMACIA BIOTECH (SWEDEN)
2) FIBERCHEM
3) THE QUANTUM GROUP
TEMPERATURE SENSORS
 LARGEST COMMERCIALLY AVAILABLE SENSORS
 RANGE -40 deg C TO 1000 deg C
 US-SMALL COMPANIES, JAPAN- HITACHI n SUMITOMO
STRAIN SENSORS
 FIBER BRAGG GRATINGS (FBG) TECHNOLOGY
 SENSES AS LITTLE AS 9 MICROSTRAIN
 NRL and UNITED TECHNOLOGY RESEARCH
BIOMEDICAL SENSORS
 SPECTROSCOPIC BIOMEDICAL SENSORS
 CO 2, O 2 and pH CAN BE MEASURED SIMULTANEOUSLY
 FLOW MONITORING BY LASER DOPPLERIMETRY
 FIBERS – OPTHALMOLOGIC APPLICATION
ELECTRICAL AND MAGNETIC SENSORS
 APPEALING- INHERENT DIELECTRIC NATURE
 LESS SENSITIVE TO ELECTROMAGNETIC INTERFERENCE
 SMALL SIZE AND SAFER
 THEY ARE ALMOST ALWAYS HYBRID
 ABB CORPORATION RESEARCH CENTER
ROTATION SENSOR
 BASED ON THE SAGNAC EFFECT
 TWO TYPES RING LASER GYROSCOPE (RLG) AND FIBER OPTIC GYROSCOPE (FOG)
 US COMPANIES PURSUING HIGH PERFORMANCE FOG’s (HONEYWELL, LITTON, NORTHRUP, ALLIED SIGNAL etc.)
PRESSURE SENSORS
 EARLIER BASED ON PIEZORESISTIVE TECHNIQUE
 BASED ON MOVABLE DIAPHRAGM
 HIGH PERFORMANCE- (POLARIZATION BASED SENSORS)
 OPERATING PRESSURE RANGES FROM 0-70,000 torr
DISPLACEMENT AND POSITION SENSORS
 ONE OF THE FIRST OPTOELECTRONIC SENSORS TO BE DEVELOPED.
 SIMPLE SENSORS RELY ON THE CHANGE IN RETROREFLECTANCE DUE TO A PROXIMAL MIRROR SURFACE
 ALSO REFERRED AS LIQUID LEVEL SENSORS
 APPLICATIONS
 MILITARY AND LAW ENFORCEMENT
 NIGHT VISION CAMERA (contd.)
COMPRISES OF :
 AMPLIFIED CCD SENSOR
 ANTI BLOOMING TECHNOLOGY
 CRYSTAL POLYMER SHUTTER
ADVANTAGES :
 EXCEPTIONAL DAY LIGHT RESOLN.
 IMMUNE TO OVER EXPOSURE
 VERY HIGH CONTARAST LEVELS
 NO HALOING OR SCINTILLATIONS
 BIOMETRICS
YOUR FACE, FINGERS AND EYES IN A WHOLE NEW LIGHT
PARTIAL DISCHARGE DETECTION USES OPTICAL FIBER SENSORS
 LETS TAKE A LOOK AT THE CHRONOLOGY OF OPTICAL SENSORS
 PUBLICATION AND PATENT TRENDS
 GEOGRAPHICAL ORIGIN OF PUBLICATIONS
 GEOGRAPHICAL ORIGIN OF OPTICAL SENSOR PATENTS
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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kindly send me full project report on optical sensors.
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