Position Sensing Mechanical Optical Magnetic Capacitive, Ultrasonic.

Slides:

Advertisements

Similar presentations

Transducers PHYS3360/AEP3630 Lecture 33.

Advertisements

Programming Logic Controllers

Semiconductor Input Devices

Part (2) Signal Generators & Sensors Lecture 5 د. باسم ممدوح الحلوانى.

1 Sixth Lecture Types of Transducers and Their Applications Instrumentation and Product Testing.

1. Output signal alternates between on and off within specified period Controls power received by a device The voltage seen by the load is directly proportional.

Sensor Technologies Class 6.

The Hall Effect Sensor Rene Dupuis. Background Information The Hall effect was discovered by Edwin Hall in 1879; “electron” was not experimentally discovered;

CMPE 118 MECHATRONICS Introduction to Sensors Or, How the world gets into our programs.

Magnetism The density of a magnetic field (number of magnetic lines passing through a given surface) is the magnetic flux: Units of flux are Webers. Tesla/m.

Position Sensing Mechanical Optical Magnetic. Mechanical Sensing - Microswitch.

Incremental Encoders. Encoders typically run on +5V, not +24V Outputs are typ. not 24V compatible either.

Magnetic Position Sensors Reed switches (sense permanent magnet) Inductive proximity sensors (eddy current) Hall Sensors (sense permanent magnet)

Computer Control. Computer Control Basics Input – (Sensors) Processing – (Black Box) Output – (Actuators)

Self-Induction Transducers ~ AC Supply v ref Inductance Measuring Circuit x (Measurand) Ferromagnetic Target Object Coil is activated by the supply and.

Storey: Electrical & Electronic Systems © Pearson Education Limited 2004 OHT 4.1 Actuators  Introduction  Heat Actuators  Light Actuators  Force, Displacement.

Mechatronics is as old as the history of modern engineering practice, But at the same time it is as new as few decades.

Sensors Introduction Describing Sensor Performance Temperature Sensors

1 Sensors BADI Year 3 John Errington MSc. 2 Sensors Allow a design to respond to its environment – e.g. a line following robot may use photosensors to.

 Proximity switches open or close an electrical circuit when they make contact with or come within a certain distance of an object. electrical circuit.

PROGRAMMABLE LOGIC CONTROLLER (PLC) AND AUTOMATION

Programmable Logic Controller

EKT314/4 Electronic Instrumentation

Topic 1 different attributes that characterize sensors ETEC 6405.

Sensor (application to measurement)

ENGR480 Manufacturing Systems Spring Manufacturing Operations Processing –Shaping (solidification, deformation, material removal, or particulate.

M. Zareinejad 1. 2 Outline # Sensors –––– Sensor types Sensor examples #Actuators Actuator types Actuator examples ––––

Magnetic Contactor For handling large current and voltage.

CSE 323b: Measurements & Testing (1)b

Introduction to Engineering Lab 4 – 1 Basic Data Systems & Circuit Prototyping Agenda REVIEW OF LAB 3 RESULTS DEFINE a DATA SYSTEM  MAJOR TYPES  ELEMENTS.

PH4705 & ET4305: Digital Sensors

Encoders What is an encoder? An encoder is a sensor for converting rotary motion or position to a series of electronic pulses.

PROGRAMMABLE LOGIC CONTROLLER DNT 353/3

1 Motion Sensors Displacement, velocity and acceleration.

9AEI It is defined as the change of position of a body with respect to a reference It may be Linear motion Rotational motion Displacement.

Today Course overview and information 09/16/2010 © 2010 NTUST.

STEPPER MOTORS Name: Mr.R.Anandaraj Designation: Associate. Professor Department: Electrical and Electronics Engineering Subject code :EC 6252 Year: II.

CBC BODY COMPUTERS CHAPTER 12. CBC OBJECTIVES H ANALOG AND DIGITAL VOLTAGE SIGNALS H COMPUTER COMMUNICATION H COMPUTER MEMORY H INPUTS H OUTPUTS H MULTIPLEXING.

Advanced Design Applications UNIT 4: MANUFACTURING

 Switches are commonly employed as input devices to indicate the presence or absence of a particular condition in a system or process that is being monitored.

Stepping motors Jari Kostamo.

ABE425 Engineering Measurement Systems Strain Gages, Bridges and Load Cells Dr. Tony E. Grift Dept. of Agricultural & Biological Engineering University.

Lecture 9: Modeling Electromechanical Systems 1.Finish purely electrical systems Modeling in the Laplace domain Loading of cascaded elements 2.Modeling.

Proximity sensors Optical – Through-beam Inductive Capacitive

Medical Instrumentation

Medical Instrumentation II. Resistive Sensor  Strain gage : changes in L & ρ  Force sensing resistor : changes in A  Thermistor : changes in L  Potentiometer.

M. Zareinejad 1. 2 Outline # Sensors –––– Sensor types Sensor examples #Actuators Actuator types Actuator examples ––––

RESISTIVE, CAPACITOR, INDUCTIVE, PIEZOELECTRIC SENSOR Tae-eui, Kim.

Typical controller system sensors acquisition system (Doepfer box,) mapping software (Max) Output (Reason)

EE 4BD4 Lecture 14 Position Sensors 1. Types of Sensors Potentiometers and linear resistors Capacitive sensors (mm distances, e.g. capacitive microphone)

1 Sensores Magnéticos José Augusto EPUSP The Types of Magnetic Sensors Reed Switches Variable Reluctance Flux-gate Magnetometers Magneto-Inductor.

1. 2 Meghanathi Gaurang k ( ) Pandey Prashant D ( ) Mishra sandip R ( )

מבוא לבקרה ד"ר משה דקלו מפגש מספר 4 אוגוסט 2010 חיישנים, מתמרים ומפעילים.

Sensors and Actuators Simple Sensors Switches and Pots Other Sensors Simple Actuators LEDs and Buzzers DC Motors MAE 156A.

Electric Pressure Transducer

Electronic Control Systems Week 3 – Switches and Sensors

Chapter Electromechanical Systems 6. Chapter Electromechanical Systems 6.

Transducers A transducer is a device that converts energy from one form to another. Ex : (Oscilloscope, since it can be used for several types of measurements,

Figure 8.1 A simple strain gage.

Mechatronics is as old as the history of modern engineering practice, But at the same time it is as new as few decades.

Discrete Position Sensing

Robotics Sensors and Vision

Displacement, velocity and acceleration

Beam Pattern and Interference

Incremental Encoders.

Electric Rotary Actuators (motors)

Sensors Chapter 17 Lesson 3.

Position Sensing Mechanical Optical Magnetic.

Discrete Position Sensing

Position Sensing Mechanical Optical Magnetic.

Presentation transcript:

Position Sensing Mechanical Optical Magnetic Capacitive, Ultrasonic

Mechanical Sensing - Microswitch

Microswitch Operation Switch exhibits mechanical hysteresis.

Microswitch Actuators

Optical Sensing LED’s and Photodiodes Transmissive/Reflective Modulated/Unmodulated Light-on/Dark-on Fiber optic

Transmissive & Reflective Sensors

Beam Pattern and Reflectance

Specular Reflection

Modulation “Chop” LED on and off at many kHz rate Bandpass filter after photodiode at the same frequency as chopping Threshold circuit after BPF generates on/off output

Magnetic Position Sensors Reed switches (sense permanent magnet) Inductive proximity sensors (eddy current) Hall Sensors (sense permanent magnet)

Inductive Proximity Sensor

Inductive Proximity Sensors

Hall Sensors Hall effect: –constant voltage forces a constant current in semiconductor sheet –magnetic field flux lines perpendicular to current cause proportional voltage across sheet. –discovered by E.F.Hall in 1879 Linear sensor needs voltage regulator and amplifier Switch also needs threshold circuit, with hysteresis

Hall Switch Magnet motion –head-on –bypass or slide-by Total effective air gap (TEAG) Sensitivity, Hysteresis, & Temperature

Other Discrete Position Sensors capacitive ultrasonic variable reluctance (coil around magnet, senses moving ferrous material)

Incremental Encoders

Encoders typically run on +5V, not +24V Outputs are typ. not 24V compatible either

Absolute Encoders doubling resolution requires adding another photodiode/LED pair cost is much higher than incremental does not require seeking to establish reference location

hybrid incr/absolute encoders add more information to index channel to reduce amount of seeking required to find reference position. interface requires lots of wires (parallel) or a special comm. protocol

Potentiometer A potentiometer (or pot) is a variable resistor wired to obtain a variable DC voltage proportional to position

Magnetostrictive Pos. Sensor Pulse sent down magnetostrictive material Pulse reflects off position magnet’s field Position is proportional to t rcvd - t sent Pulse propagates at ~2800 m/s Resolution is ~.001” with t update ~1msec/in.

Magnetostrictive Sensor

Force Sensing - Strain gage - Piezoelectric

Strain Gages and Load Cells Vr = Vout/Vin(strained) – Vout/Vin(unstrained) GF = gage factor

Load Cells