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Sensors and Transducer

IV SEMESTER

ETIC-203

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UNIT-I�Sensors and Transducer

Definition and differences between Sensors and Transducers

Static and Dynamic Characteristics

Electrical and Mechanical Characterization�Bath tub Curve

Potentiometer�Strain gauges�Capacitive sensors-All Types�Inductive sensors

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Difference between sensors and transducer

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Difference between sensors and transducer

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Difference between sensors and transducer

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Human Body Sensors

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Transducer

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Transducer

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Difference between sensors and transducer

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Comparison between Sensors &Transducers

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Types of Sensors

  • Classification of Sensors
  • Based on physical laws or convenient distinguishing property
  • 1. Active and Passive sensors
  • 2. Contact and non-contact sensors
  • 3. Absolute and relative sensors
  • 4. Others

Department of Electrical and Electronics Engineering, BVCOE New Delhi Subject: Sensor and Transducer , Instructor: Ritambhra Katoch

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Active and Passive sensor

  • Passive sensor : A sensor that requires external power to operate, e.g., carbon microphone, thermistors,
  • strain gauges, capacitive and inductive sensors, etc.
  • The active sensor is also called as parametric sensor (output is a function of a parameter - like resistance)

  • Active Sensor: It generates its own electric signal and does not require a power source, e.g.
  • thermocouples, magnetic microphones, piezoelectric sensors, photodiode.
  • Also called as self-generating sensor

Department of Electrical and Electronics Engineering, BVCOE New Delhi Subject: Sensor and Transducer , Instructor: Ritambhra Katoch

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Different Types of sensors

  • Contact sensor: A sensor that requires physical contact with the stimulus, e.g., strain gauges,
  • temperature sensors

  • Non-contact sensor:It requires no physical contact, e.g., most optical and magnetic sensors, infrared
  • thermometers, etc.

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Department of Electrical and Electronics Engineering, BVCOE New Delhi Subject: Sensor and Transducer , Instructor: Ritambhra Katoch

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Different Types of sensors

  • Absolute sensor: A sensor that reacts to a stimulus on an absolute scale, such as thermistors, strain
  • gauges, etc., (thermistor always reads the absolute temperature)

  • Relative sensors: The stimulus is sensed relative to a fixed or variable reference, for example
  • thermocouple measures the temperature difference; pressure is often measured relative to
  • atmospheric pressure

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Classification

  • Classification based on broad area of detection: Electric sensors, Magnetic, Electromagnetic, Acoustic, Chemical,
  • Optical, Heat, Temperature, Mechanical, Radiation, Biological etc.
  • Classification based on physical law: Photoelectric, Magnetoelectric, Thermoelectric, Photoconductive,
  • Photomagnetic, Thermomagnetic, Thermotic, Electrochemical, Magneto resistive, Photo elastic etc.
  • Classification based on Specification: Accuracy, sensitivity, Stability, response time, hysteresis, Frequency response, input, resolution, linearity, hardness, cost, size, weight, conduction materials, temperature etc.

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Classification

input, resolution, linearity, hardness, cost, size, weight, conduction materials, temperature etc.

  • Classification as per Application: Agriculture, Automotive, Civil engineering and construction, Domestic appliances,
  • Commerce, Finance Environment, Meteorology, security, Energy, Information and Telecommunication, Health and
  • medicine, Marine, Military and Space, Recreation and toys, Scientific measurement, Manufacturing and
  • Transportation and many more…

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Classification

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Types of Sensors

  • Different Types of Sensors
  • The following is a list of different types of sensors that are commonly used in various applications. All these sensors are used for measuring one of the physical properties like Temperature, Resistance, Capacitance, Conduction, Heat Transfer etc.
  • Temperature Sensor
  • Proximity Sensor
  • Accelerometer
  • IR Sensor (Infrared Sensor)
  • Pressure Sensor

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Types of Sensors

  1. Light Sensor
  2. Ultrasonic Sensor
  3. Smoke, Gas and Alcohol Sensor
  4. Touch Sensor
  5. Color Sensor
  6. Humidity Sensor
  7. Tilt Sensor
  8. Flow and Level Sensor

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Classification

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Classification

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Properties of Good Sensor

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Characteristics of Sensors &Transducers

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Characteristics of Sensors &Transducers

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Static Characteristics

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Static Characteristics

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Static Characteristics

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Static Characteristics

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Static Characteristics

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Static Characteristics

  • Resolution: Some elements are characterized by the output
  • increasing in a series of discrete steps or jumps in response to a
  • continuous increase in input. Resolution is defined as the largest
  • change in I that can occur without any corresponding change in O.

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Dynamic Characteristics

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Dynamic Characteristics

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Dynamic Characteristics

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Bathtub Curve

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Bathtub Curve

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Bathtub Curve

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INFANT MORTALITY PERIOD

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NORMAL LIFE PERIOD

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WEAR OUT PERIOD

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Potentiometer

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Potentiometer

  • Potentiometer :It is defined as a three-terminal resistor having either sliding or rotating contact that forms an adjustable voltage divider. In order to use the potentiometer as a rheostat or variable resistor, it should have only two terminals with one end and the wiper.

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Potentiometer working principle

The potentiometer consists of L which is a long resistive wire and a battery of known EMF V whose voltage is known as driver cell voltage. Assume a primary circuit arrangement by connecting the two ends of L to the battery terminals. One end of the primary circuit is connected to the cell whose EMF E is to be measured and the other end is connected to galvanometer G. This circuit is assumed to be a secondary circuit.

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Properties of Potentiometer

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Construction of Linear Potentiometer

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Ckt Diagram

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Mathematical Description

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Mathematical Description

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Strain gauge

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Basic Term used in Strain Gauge

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Basic Term used in Strain Gauge

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Theory of Strain Gauge

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Theory of Strain Gauge

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Theory of Strain Gauge

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Theory of Strain Gauge

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Advantages and Disadvantages

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Ideal Material for Strain Gauge

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Types of Strain Gauge

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Types of Strain Gauge

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Inductive Sensors

  • An inductive sensor is a device that uses the principle of electromagnetic induction to detect or measure objects. An inductor develops a magnetic field when a current flows through it; alternatively, a current will flow through a circuit containing an inductor when the magnetic field through it changes. This effect can be used to detect metallic objects that interact with a magnetic field. Non-metallic substances such as liquids or some kinds of dirt do not interact with the magnetic field, so an inductive sensor can operate in wet or dirty conditions

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Basic Terms in Inductive Sensors

Simple Inductance

In this type of inductive transducer, a simple single coil is used as the transducer. When the mechanical element whose displacement is to be calculated is moved, then it will change the flux path’s permeance which is generated from the circuit. It modifies the inductance of the circuit as well as the equivalent output. The circuit o/p can be directly adjusted against the input value. Therefore, directly it provides the parameter’s valve to be calculated.

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Basic Terms in Inductive Sensors

Two-Coil Mutual Inductance

  • In this type of transducer, there are two different coils are arranged. In the primary coil, the excitation can be generated with external power source whereas in the next coil the output can be attained. Both the mechanical input as well as output are proportional.

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Inductive Transducer Working Principle

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The working principle of an inductive transducer is the magnetic material’s induction. Just like the electrical conductor’s resistance, it depends on various factors. The magnetic material’s induction can depend on different variables like the twists of the coil over the material, the magnetic material’s size, & he flux’s permeability.

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Inductive Sensor Ckt Diagram

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Basic Principle of Inductive sensor

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Basic Principle of Inductive sensor

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Basic Principle of Inductive sensor

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Eddy Current Production

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Transformer Type Transducer

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Principle

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Capacitive Transducer(sensors)�

Definition: The capacitive transducer is used for measuring the displacement, pressure and other physical quantities. It is a passive transducer that means it requires external power for operation. The capacitive transducer works on the principle of variable capacitances. The capacitance of the capacitive transducer changes because of many reasons like overlapping of plates, change in distance between the plates and dielectric constant.

The capacitive transducer contains two parallel metal plates. These plates are separated by the dielectric medium which is either air, material, gas or liquid. In the normal capacitor the distance between the plates are fixed, but in capacitive transducer the distance between them are varied.

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Capacitive Transducer

  • The capacitive transducer contains two parallel metal plates. These plates are separated by the dielectric medium which is either air, material, gas or liquid. In the normal capacitor the distance between the plates are fixed, but in capacitive transducer the distance between them are varied.
  • The capacitive transducer uses the electrical quantity of capacitance for converting the mechanical movement into an electrical signal. The input quantity causes the change of the capacitance which is directly measured by the capacitive transducer.

  • The capacitors measure both the static and dynamic changes. The displacement is also measured directly by connecting the measurable devices to the movable plate of the capacitor. It works on with both the contacting and non-contacting modes

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Principle of Operation

The equations below express the capacitance between the plates of a capacitor

                        

Where A – overlapping area of plates in m2�d – the distance between two plates in meter�ε – permittivity of the medium in F/m�εr – relative permittivity�ε0 – the permittivity of free space

 

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Principle of Operation

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The schematic diagram of a parallel plate capacitive transducer is shown in the figure below. 

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducer

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Capacitive Transducers

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Capacitive Transducer

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Application Of Capacitive transducer

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The capacitive transducer is mainly used for measurement of linear displacement. The capacitive transducer uses the following three effects.

  • Variation in capacitance of transducer is because of the overlapping of capacitor plates.
  • The change in capacitance is because of the change in distances between the plates.
  • The capacitance changes because of dielectric constant.

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Advantage of Capacitive Transducer�

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The following are the major advantages of capacitive transducers.

  • It requires an external force for operation and hence very useful for small systems.
  • The capacitive transducer is very sensitive.
  • It gives good frequency response because of which it is used for the dynamic study.
  • The transducer has high input impedance hence they have a small loading effect.
  • It requires small output power for operation.

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Disadvantages of capacitive Transducer�

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The main disadvantages of the transducer are as follows.

  • The metallic parts of the transducers require insulation.
  • The frame of the capacitor requires earthing for reducing the effect of the stray magnetic field.
  • Sometimes the transducer shows the nonlinear behaviors because of the edge effect which is controlled by using the guard ring.
  • The cable connecting across the transducer causes an error.

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Uses of Capacitive Transducer�

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The following are the uses of capacitive transducer.

  1. The capacitive transducer uses for measurement of both the linear and angular displacement. It is extremely sensitive and used for the measurement of very small distance.
  2. It is used for the measurement of the force and pressures. The force or pressure, which is to be measured is first converted into a displacement, and then the displacement changes the capacitances of the transducer.
  3. It is used as a pressure transducer in some cases, where the dielectric constant of the transducer changes with the pressure.

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Uses of Capacitive Transducer

  1. It is used as a pressure transducer in some cases, where the dielectric constant of the transducer changes with the pressure.
  2. The humidity in gases is measured through the capacitive transducer.
  3. The transducer uses the mechanical modifier for measuring the volume, density, weight etc.

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Hall Effect Sensor

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Hall Effect Sensor

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Hall Effect Sensor

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Hall Effect Sensor

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Hall Effect Sensor

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Hall Effect Sensor

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Hall Effect Sensor

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Hall Effect Sensor

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Hall Effect Sensor

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Hall Effect Sensor

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Application of Hall Effect Sensors

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Proximity sensor

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Anisotropic Magnetoresistive effect�Geometrical Magnetoresistive Effect

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SQUID SENSORS

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Scintillation Sensors

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Scintillation Sensors

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Scintillation Sensors

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Scintillation Sensors

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Scintillation Sensors

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Scintillation Sensors

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Interferometer

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Seismic Mass transducer

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Seismic Mass transducer

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Seismic Mass transducer

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Seismic Mass transducer

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Design Elements of Control System

  1. Define Control Objective
  2. Select Measurements
  3. Select Manipulated Variables
  4. Best Control Configuration
  5. Design of controllers

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Define Control Objectives

Input Variables

Output variables