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1
OPTICAL SENSORS AND
THEIR APPLICATIONS
PRESENTED BY
GAURAV PURI
ELECTRICAL ENGINEERING
SUNY AT BUFFALO
gapuri@buffalo.edu
2
TOPICS INCLUDED IN THIS
PRESENTATION
 INTRODUCTION
 WHY OPTICAL SENSORS ?
 PRINCIPLE OF OPTICAL SENSORS
 CLASSIFICATION AND COMPARISON
 SOME INTERESTING APPLICATIONS
 WHERE DO WE GO FROM HERE ?
3
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
4
WHY OPTICAL SENSORS
 ELECTROMAGNETIC IMMUNITY
 ELECTRICAL ISOLATION
 COMPACT AND LIGHT
 BOTH POINT AND DISTRIBUTED
CONFIGURATION
 WIDE DYNAMIC RANGE
 AMENABLE TO MULTIPLEXING
5
WORKING PRINCIPLE
• LIGHT BEAM CHANGES BY THE
PHENOMENA THAT IS BEING MEASURED
• LIGHT MAY CHANGE IN ITS FIVE OPTICAL
PROPERTIES i.e INTENSITY, PHASE,
POLARIZATION,WAVELENGTH AND
SPECTRAL DISTRIBUTION
6
CLASSIFICATION
 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
7
CLASSIFICATION (contd.)
 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.
8
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
9
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
10
 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
11
 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
12
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
13
APPLICATIONS
 MILITARY AND LAW ENFORCEMENT
THIS SENSOR ENABLES LOW LIGHT IMAGING AT TV FRAME
RATES AND ABOVE WITHOUT THE LIMITATIONS OF VACUM TUBE
BASED SYSTEMS.
14
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
15
BIOMETRICS
YOUR FACE, FINGERS AND EYES IN A WHOLE
NEW LIGHT
• IMAGE CAPTURE
• IMAGE PROCESSING
• FEATURE EXTRACTION
• FEATURE COMPARISON
16
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 !!!!
17
THANK YOU FOR YOUR
PATIENCE AND TIME

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OPTICAL SENSORS AND THEIR APPLICATIONS

  • 1. 1 OPTICAL SENSORS AND THEIR APPLICATIONS PRESENTED BY GAURAV PURI ELECTRICAL ENGINEERING SUNY AT BUFFALO gapuri@buffalo.edu
  • 2. 2 TOPICS INCLUDED IN THIS PRESENTATION  INTRODUCTION  WHY OPTICAL SENSORS ?  PRINCIPLE OF OPTICAL SENSORS  CLASSIFICATION AND COMPARISON  SOME INTERESTING APPLICATIONS  WHERE DO WE GO FROM HERE ?
  • 3. 3 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
  • 4. 4 WHY OPTICAL SENSORS  ELECTROMAGNETIC IMMUNITY  ELECTRICAL ISOLATION  COMPACT AND LIGHT  BOTH POINT AND DISTRIBUTED CONFIGURATION  WIDE DYNAMIC RANGE  AMENABLE TO MULTIPLEXING
  • 5. 5 WORKING PRINCIPLE • LIGHT BEAM CHANGES BY THE PHENOMENA THAT IS BEING MEASURED • LIGHT MAY CHANGE IN ITS FIVE OPTICAL PROPERTIES i.e INTENSITY, PHASE, POLARIZATION,WAVELENGTH AND SPECTRAL DISTRIBUTION
  • 6. 6 CLASSIFICATION  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
  • 7. 7 CLASSIFICATION (contd.)  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.
  • 8. 8 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
  • 9. 9 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
  • 10. 10  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
  • 11. 11  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
  • 12. 12 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
  • 13. 13 APPLICATIONS  MILITARY AND LAW ENFORCEMENT THIS SENSOR ENABLES LOW LIGHT IMAGING AT TV FRAME RATES AND ABOVE WITHOUT THE LIMITATIONS OF VACUM TUBE BASED SYSTEMS.
  • 14. 14 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
  • 15. 15 BIOMETRICS YOUR FACE, FINGERS AND EYES IN A WHOLE NEW LIGHT • IMAGE CAPTURE • IMAGE PROCESSING • FEATURE EXTRACTION • FEATURE COMPARISON
  • 16. 16 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 !!!!
  • 17. 17 THANK YOU FOR YOUR PATIENCE AND TIME