in the name of godsaba.kntu.ac.ir/eecd/ecourses/instrumentation/projects...zdifferential transmitter...
TRANSCRIPT
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IN THE NAME OF GODIN THE NAME OF GOD
Instrumentation Term ProjectInstrumentation Term Project
Supervised By: Dr. Supervised By: Dr. HamidHamid D. TaghiradD. Taghirad
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Magnetic position sensor
Ehsan PeymaniGolnaz Habibi
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Magnetic Sensor
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Feature of Magnetic Sensors
Advantage- Contact less- Unaffected by Contamination
Disadvantage- affected by other magnetic field
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Position sensing ( all types )
CapacitiveEddy currentOpticalInductiveResistiveSonarLaserMagnetic
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All Types of Magnetic Position Sensor
Hall effect sensorMagnetostrictiveMagnetoresistiveBase on Seismic theory Reed switchSynchro & ResolverInductosynMagnesynMagnetic encoderLVDT & RVDT
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Special application
CompassingGPS navigationVehicle detection
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Special applicationCompassing
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Special application Compassing
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Special application Compassing
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Special applicationGPS navigation
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Special applicationGPS navigation
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Special applicationVehicle detection
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Special applicationVehicle detection
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Special applicationVehicle direction
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Smart position sensor
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Smart position sensor
Specifications :
Magnetostrictive LDTSmall & InexpensiveLinearity+/- 0.05% of StrokeAccuracy+/- 0.1% of StrokeRepeatability+/- 0.01% of full strokeOperating Temperature-20° to 70° C Programmable
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Hall Effect Sensor
Hall effect : Dr. Edvin Hall , 1879Johns Hopkins University
Hall sensor : Joe Maupin & EverttVorthmann , 1965
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Hall effectGeneral features
• True solid state• Long life • High speed operation - over 100 kHz
possible• Operates with stationary input (zero speed)• No moving parts• Logic compatible input and output• Broad temperature range (-40 to +150°C)• Highly repeatable operation
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Hall effectTheory
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Hall effect
Theory
tBIKV H
H =
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Hall effect
Theory
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Hall effectConditional Circuit
GVVS µ7=
!!! Silicon exhibits the piezoresistance effect
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Hall effectConditional Circuit
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Hall effectDigital Hall sensors
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Hall effectAnalog Hall sensors
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Hall effectMagnetic system
Unipolar head-on modeUnipolar slide-by modeBipolar slide-by modeBipolar slide-by mode (ring magnet)
Jump to Application
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Hall effectMagnetic system
Unipolar head-on modeNonlinearAccuracy medium
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Hall effectMagnetic system
Unipolar slide-by modeNonlinearAccuracy lowSymmetric
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Hall effectMagnetic system
Bipolar slide-by modeAccuracy mediumDissymmetry
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Hall effectMagnetic system
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Hall effectMagnetic system
Bipolar slide-by mode (ring magnet)
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Hall effectMagnetic system comparison chart
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Hall effectApplication – Vane operated position sensors
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Hall effectApplication – Vane operated position sensors
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Hall effectApplication – Other in position
Sequence sensorProximity sensorOffice machine sensorsMultiple position sensorAnti-skid sensorPiston detection sensor
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Hall effectApplication – Sequence sensor
Back
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Hall effectApplication – Proximity sensor
Back
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Hall effectApplication – Office machine sensors
Back
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Hall effectApplication – Multiple position sensor
Back
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Hall effectApplication – Anti-skid sensor
Back
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Hall effectApplication – Piston detection sensor
Back
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Magnetostrictive sensors
Invent at 1970 MTS Temposonictechnology
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Theory of Magnetostrictive sensors
Manetostrictive effectVillari effectWiedemann effect
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Theory of Magnetostrictive sensorsManetostrictive effect
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Theory of Magnetostrictive sensorsVillari effect
Reverse of Magnetoestrictive
applying stress to a magnetostrictive material
changes its magnetic properties
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Theory of Magnetostrictive sensorsWiedemann effect
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Theory of Magnetostrictive sensorsThe operation
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Theory of Magnetostrictive sensorsThe operation
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Magnetostriction sensorsFeatures
Non contactAbsolute10 mm ~ 20 mNonlinearity < 0.02%
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Magnetostriction sensorsComparison
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Magnetostriction sensorsApplication
1. Automated (Robotic) ManualTrans ission2. Automotive Suspensions3. Automotive Steering4. Medical Hospital and Home Care Bed5. Medical Infusion Pump6. Medical Dental Chairs7. Tractor Steering8. Commercial Appliance Damping9. Automotive Tank Levels10. Construction Equipment
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Magnetostriction sensorsApplication – Automated (Robotic) ManualTrans ission
Back
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Magnetostriction sensorsApplication - Automotive Suspensions
Back
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Magnetostriction sensorsApplication - Automotive Steering
Back
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Magnetostriction sensors
Application - Medical Hospital and Home Care Bed
Back
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Magnetostriction sensorsApplication - Medical Infusion Pump
Back
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Magnetostriction sensorsApplication - Medical Dental Chairs
Back
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Magnetostriction sensorsApplication - Tractor Steering
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Magnetostriction sensorsApplication - Commercial Appliance Damping
Back
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Magnetostriction sensors
Application - Construction Equipment
Back
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Magnetostriction sensorsApplication - Automotive Tank Levels
Back
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Magnetoresistive sensors
Invent at 1856William ThompsonLord Kelvin
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Magnetoresistive sensorsAll types
Anisotropic Magnetoresistive (AMR)
Giant Magnetoresistive (GMR)
Colossal Magnetoresistance (CMR)
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Magnetoresistive sensorsTheory of AMR
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Magnetoresistive sensorsTheory of AMR
θ2cos
Barber Pole Bias
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Magnetoresistive sensorsTheory of AMR
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Magnetoresistive sensorsOperation of AMR
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Magnetoresistive sensorsOperation of AMR (HMC1501)
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Magnetoresistive sensorsOperation of AMR (HMC1501)
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Magnetoresistive sensorsOperation of AMR (HMC1501)
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Magnetoresistive sensorsOperation of AMR (HMC1512)
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Magnetoresistive sensorsOperation of AMR (HMC1512)
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Magnetoresistive sensorsOperation of AMR (HMC1512)
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Magnetoresistive sensorsOperation of AMR (HMC1512)
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Magnetoresistive sensorsTypical application
Cylinder position sensing in pneumatic cylinders Elevator sensor Lid sensor for laptop computers Position sensor for materials handling equipment (lift trucks) Blood analyzer Magnetic encoders
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Magnetoresistive sensors
Comparision of Hall effect & MR technologies
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Magnetoresistive sensorsGiant Magnetoresistive (GMR)
Observe at 1988Magnetoresistivity > 70%
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Magnetoresistive sensorsGiant Magnetoresistive (GMR) - Theory
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Magnetoresistive sensorsGiant Magnetoresistive (GMR) - Application
Proximity DetectionDisplacement SensingRotational Reference Detection
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Colossal Magnetoresistive (CMR)
Observe at 1988Magnetoresistivity > 1000% ~ 10000000%
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Magnetoresistive sensorsComparison
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Reed switch
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Reed switchStructure
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Reed switchAdvantages
Long lifeSmall sizeVery sensitive to magnetic fieldsHas no leakage current or voltage dropVery inexpensiveHighly repeatable operation High immunity to dirt and contaminationZero power consumption
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It is electronically noisySlow response timeLarge amount of hysteresis
Reed switchDisadvantages
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Synchro & Resolver
A device called Selsyn was developed at 1925
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SynchroTheory
Synchro is variable rotary transformer.
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SynchroClassification
Transmitter
ControlTorque
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SynchroClassification
Receiver
ControlTorque
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SynchroClassification
Differential Transmitter
ControlTorque
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SynchroClassification
ControlTorque
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SynchroAdvantages
The controlling unit can be along distance from the controlled unit.Low consumption.Eliminates the necessity of mechanical linkage.Continues accurate and visual information.Good reliability and minimum maintenances .Small and light.Very fast.
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Resolver
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ResolverTheory
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Signal Conditioning
Resolver-To-Digital Converter(RTD /RDC)BasicUndersamplingOversampling
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RTDBasic
.
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RTDUndersampling
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RTDUndersampling
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RTDOversampling
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OversamplingTMS320F240
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ResolverAdvantages
Accurate Absolute Position SensorSmall sizeWell-suited to severe industrial environmentsNot require ohmic contact.High reliability
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Synchro& ResolverApplication
Naval weaponsRadar antennasAerospaceRobotics
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Inductosyns
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Inductosyns types
Linear inductosynRotary inductosyn
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Linear inductosyns
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inductosynsSpecification
Use RTD for signal conditioningLinear resolution is 5microinch.angular resolution is less than 0.9 arc secondsrelatively expensivevery high accuratevery reliable
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inductosynsAdvantages & Disadvantages
AccurateSmall sizeWell-suited to severe industrial environmentsNot require ohmic contactHigh reliability but relatively expensive
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Magnesyn
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MagnesynStructure
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Magnetic encoderAll types
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LVDT & RVDT
End of World War II
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Linear Variable Differential Transformer(LVDT)
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PRECISION ABSOLUTE VALUE CIRCUIT(FULL-WAVE RECTIFIER)
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LVDT & RVDTComparison
LVDTMeasurement ranges are ±100µm to ±25cmSensitivity is 2.4mv per volt per degree of rotationInput voltages are from 1V to 24V RMS, with frequencies 50Hz-0kHz
RVDTTypical RVDTs are linear over a range of about ±40ºSensitivity is 2 to 3mV per volt per degree of rotationInput voltages in the range of 3V RMS at frequencies between 400Hz and 20kHz.
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Advantages
Infinite ResolutionHigh accuracy and sensitivityExcellent linearity ( 0.5%)A wide variety of measurement ranges
LVDT
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Application
Modern Machine-toolRoboticsAvionics & aircraftProcess control industryTorpedo, and weapons systems.
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Thank you