Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: What is LVDT ?
Share
Notification Show More
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Pressure Measurement > What is LVDT ?

What is LVDT ?

Last updated: October 25, 2019 9:27 pm
Editorial Staff
Pressure Measurement
No Comments
Share
4 Min Read
SHARE

Linear Variable Displacement Transducer (LVDT):

A very basic transducer which is always useful in the field of instrumentation, I have studied about this in my college days.

Now let me explain about the LVDT with its Principle of Operation and I will explain how it is constructed for its well known operation and you can understand the working of LVDT.

Principle of LVDT:

LVDT works under the principle of mutual induction, and the displacement which is a non-electrical energy is converted into an electrical energy.

And the way how the energy is getting converted is described in working of LVDT in a detailed manner.

Construction of LVDT:

Linear Variable Displacement Transducer (LVDT)

LVDT consists of a cylindrical former where it is surrounded by one primary winding in the centre of the former and the two secondary windings at the sides.

The number of turns in both the secondary windings are equal, but they are opposite to each other, i.e., if the left secondary windings is in the clockwise direction, the right secondary windings will be in the anti-clockwise direction, hence the net output voltages will be the difference in voltages between the two secondary coil.

The two secondary coil is represented as S1 and S2. Esteem iron core is placed in the centre of the cylindrical former which can move in to and fro motion as shown in the figure.

The AC excitation voltage is 5 to 12V and the operating frequency is given by 50 to 400 HZ.

Also See : LVDT Working Animation

Working of LVDT:

Let’s study the working of LVDT by splitting the cases into 3 based on the iron core position inside the insulated former.

Case 1:

On applying an external force which is the displacement, if the core reminds in the null position itself without providing any movement then the voltage induced in both the secondary windings are equal which results in net output is equal to zero

i.e., Esec1-Esec2=0

Case 2:

When an external force is appilied and if the steel iron core tends to move in the left hand side direction then the emf voltage induced in the secondary coil is greater when compared to the emf induced in the secondary coil 2. Therefore the net output will be Esec1-Esec2

Case 3:

When an external force is applied and if the steel iron core moves in the right hand side direction then the emf induced in the secondary coil 2 is greater when compared to the emf voltage induced in the secondary coil 1. therefore the net output voltage will be Esec2-Esec1

Advantages of LVDT:

  • Infinite resolution is present in LVDT
  • High output
  • LVDT gives High sensitivity
  • Very good linearity
  • Ruggedness
  • LVDT Provides Less friction
  • Low hysteresis
  • LVDT gives Low power consumption.

Disadvantages of LVDT:

  • Very high displacement is required for generating high voltages.
  • Shielding is required since it is sensitive to magnetic field.
  • The performance of the transducer gets affected by vibrations
  • Its is greatly affected by temperature changes.

Applications of LVDT:

  • LVDT is used to measure displacement ranging from fraction millimeter to centimeter.
  • Acting as a secondary transducer, LVDT can be used as a device to measure force, weight and pressure, etc..
Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Pressure Unit Conversion Practical Example
Pressure Gauge Problems
Pressure Gauge Water Traps and Pigtail Siphons
What is Sensor Trim and Output Trim in Smart Transmitter?
Pressure Transmitter Preventive Maintenance
Pneumatic Pressure Transmitters Principle
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

How to Measure Pressure in Inches of Water Column
Metal Foil Strain Gauge Principle
Commissioning a Differential Pressure Transmitter in a Pressurized Boiler Steam Drum
What are Impulse Lines? – Impulse Line Problems & Solutions
Types of Pressure Measuring Scales
3 Valve Manifold Operation
Advantages of Pneumatic Systems in the Automotive Industry
Pressure Gauges with Capsule Sensor Principle

Keep Learning

Pressure Transmitter Basics

Pressure Transmitter Applications

Sealed Bellows Temperature Sensors

Bellows Pressure Sensors Working Principle Animation

Hammer Effect in Gauges

What is Hammer Effect in Gauges ?

Functions of Pressure Detectors

Functions of Pressure Detectors

Pressure Transmitter

Pressure Transmitter Animation

C-Bourdon Tube

C-Bourdon Tube Pressure Gauge Theory

Pressure Detection Circuit

Pressure Detection Circuit

diaphragm-pressure-gauge

Diaphragm Pressure Sensors

Learn More

Cyber Security Multiple Choice Questions and Answers

Cyber Security Multiple Choice Questions and Answers

RF Capacitance Switch Principle

Safety Switches for Controlling Conveyor Operations

FOUNDATION Fieldbus junction boxes

Fieldbus Cables

Electrical Machines Questions and Answers

Synchronous Machines Power Factor Control Questions

Instrument Calibration Lab Exercise

Instrument Calibration Lab Exercise

Calculate Power in Series RL Circuit

Calculate Power in Series RL Circuit

Automation in laboratory

Automating Lab Data Reconciliation: Key Steps to Success

Optical Pyrometer

Optical Pyrometer Working Principle

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?