LVDT is an acronym for Linear Variable Differential Transformer. It is a common type of electromechanical transducer that can convert the rectilinear motion of an object to which it is coupled mechanically into a corresponding electrical signal
INTRODUCTION TO LVDT,RVDT and Potentiometer SACHINNikam39
DISPLACEMENT MEASUREMENT - Linear variable differential transducer is a important topic under measurement and instrumentation.
in this presentation i am providing basic of LVDT,RVDT
INTRODUCTION TO LVDT,RVDT and Potentiometer SACHINNikam39
DISPLACEMENT MEASUREMENT - Linear variable differential transducer is a important topic under measurement and instrumentation.
in this presentation i am providing basic of LVDT,RVDT
LINEAR POTENTIOMETER Potentiometers are electrical devices which are a form of variable resistance.
It consists of a sliding contact which moves over the length of a resistance element. This sliding contact connects to a plunger, which links to the object whose displacement is to be measured.
Referring to the electrical circuit shown here, An input voltage Xt is applied across the whole resistance element, at points A and C. The output voltage, Xi , is measured between the sliding contact at point B and the end of the resistance element at point C. A linear relationship exists between the input voltage Xt, output voltage Xi and the distance BC.
ANGULAR POTENTIOMETER Rotary or angular potentiometers measure angular displacement .
Here in this presentation we will discussing about Inductive Transducer and its working principle, a brief classification of Inductive Transducer and derivation of transducer applications
Types of Transducers
Analog and Digital Transducer
Characteristic of Transducer
Selection factor of Transducer
Measurement of Displacement
LVDT and RVDT
Different types of strain Gauges
Manometers
Pressure Measuring Elements
Hall Effect
Thermocouple
This presentation content various types of strain gauges, derivation of gauge factor.
Various course having subject as instrumentation, measuring devices, contenting strain measurement as a topic so introduction to strain gauge can help to understand the topic.
A Kelvin bridge, also called a Kelvin double bridge and in some countries a Thomson bridge, is a measuring instrument used to measure unknown electrical resistors below 1 ohm. It is specifically designed to measure resistors that are constructed as four terminal resistors.
In this u will study about
1.Working Principle
2.Parameter for CTT
3.Applications (in details)
4.Advantages
5.Disadvantages
of Capacitive Type Transducer
LINEAR POTENTIOMETER Potentiometers are electrical devices which are a form of variable resistance.
It consists of a sliding contact which moves over the length of a resistance element. This sliding contact connects to a plunger, which links to the object whose displacement is to be measured.
Referring to the electrical circuit shown here, An input voltage Xt is applied across the whole resistance element, at points A and C. The output voltage, Xi , is measured between the sliding contact at point B and the end of the resistance element at point C. A linear relationship exists between the input voltage Xt, output voltage Xi and the distance BC.
ANGULAR POTENTIOMETER Rotary or angular potentiometers measure angular displacement .
Here in this presentation we will discussing about Inductive Transducer and its working principle, a brief classification of Inductive Transducer and derivation of transducer applications
Types of Transducers
Analog and Digital Transducer
Characteristic of Transducer
Selection factor of Transducer
Measurement of Displacement
LVDT and RVDT
Different types of strain Gauges
Manometers
Pressure Measuring Elements
Hall Effect
Thermocouple
This presentation content various types of strain gauges, derivation of gauge factor.
Various course having subject as instrumentation, measuring devices, contenting strain measurement as a topic so introduction to strain gauge can help to understand the topic.
A Kelvin bridge, also called a Kelvin double bridge and in some countries a Thomson bridge, is a measuring instrument used to measure unknown electrical resistors below 1 ohm. It is specifically designed to measure resistors that are constructed as four terminal resistors.
In this u will study about
1.Working Principle
2.Parameter for CTT
3.Applications (in details)
4.Advantages
5.Disadvantages
of Capacitive Type Transducer
Requirements of a sensor, Principles and Applications of the following types of sensors- Position sensors - Piezo Electric Sensor, LVDT, Resolvers, Optical Encoders, pneumatic Position Sensors, Range Sensors Triangulations Principles, Structured, Lighting Approach, Time of Flight, Range Finders, Laser Range Meters, Touch Sensors ,binary Sensors., Analog Sensors, Wrist Sensors, Compliance Sensors, Slip Sensors, Camera, Frame Grabber, Sensing and Digitizing Image Data- Signal Conversion, Image Storage, Lighting Techniques, Image Processing and Analysis-Data Reduction, Segmentation, Feature Extraction, Object Recognition, Other Algorithms, Applications- Inspection, Identification, Visual Serving and Navigation.
Linear Variable Differential Transformer (detailed presentation)Tanish Gupta
Linear Variable Differential Transformer
1. What is an LVDT?
2. Circuit Diagram of LVDT
3. Principle of LVDT
4. How LVDT works?
5. Types of LVDT’s
6. Unguided Armature
7. Captive Armature
8. LVDT Characteristics
9. Summary
10. Thank You
Ch2-Diode.for electrical and computer engineeringabdiihuseen31
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Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
3. TRAnSDuCeR
Transducersareelectric or electronic
devicesthat transform energy from one
form to another.
In reality, however, anything that
convertsenergy can beconsidered a
transducer.
. For example, astereo speaker converts
theelectrical signalsof recorded music
into sound
4. What is a LVDT?
Electromechanical
transducer
Coupled to any type of object/structure
Converts the rectilinear motion of an
object into a corresponding electrical
signal
Measures Displacement!!!!!!!!
Precision of LVDT
Movements as small as a few millionths of
an inch
Usually measurements are taken on the
order of ±12 inches
Some LVDT’s have capabilities to measure
up to ±20 inches
5. L?V?D?T?
Linear Variable Differential Transformer
Transformer: AC Input / AC Output
Differential: Natural Null Point in
Middle
Variable: Movable Core, Fixed Coil
Linear: Measures Linear Position
6. Why LVDT?
FRICTION – FREE OPERATION
No mechanical contact between core and coil (usually)
Infinite Mechanical Life
INFINITE RESOLUTION
Electromagnetic coupling
Limited only by electrical noise
Low risk of damage
Most LVDT’s have open bore holes
Null Point Repeatability
Zero displacement can be measured
Single Axis Sensitivity
Effects of other axes are not felt on the axis of interest
Environmentally Robust
Stable/Strong sensors – good for structural engineering tests!!!
7. Definition of LVDT.
The term LVDT stands for theLinear Variable
Differential Transformer. It is the most widely used
inductive transducer that covert the linear motion
into the electrical signals . The output across
secondary of this transformer is the differential so
it is called so.
8. construction
Main Features of Construction are as, The
transformer consists of a primary winding P
and two secondary winding S1 and S2 wound
on a cylindrical former (which is hollow in
nature and will contain core).
Both the secondary windings have equal
number of turns and are identically placed
on the either side of primary winding
The primary winding is connected to an AC
source which produces a flux in the air gap
and voltages are induced in secondary
windings.
9. LVDT Components
Signal conditioning circuitry
Primary coil
Secondary coil
Secondary coil
Bore shaft
Ferrous core
Source: http://www.macrosensors.com/lvdt_macro_sensors/lvdt_tutorial/lvdt_primer.pdf
Cross section of a DC-LVDT
Epoxy encapsulation
Stainless steel end caps
High density glass filled coil forms
Magnetic shielding
10. A movable soft iron core is placed inside
the former and displacement to be
measured is connected to the iron core.
The iron core is generally of high
permeability which helps in reducing
harmonics and high sensitivity of LVDT.
11. The LVDT is placed inside a stainless steel
housing because it will provide
electrostatic and electromagnetic
shielding.
The both the secondary windings are
connected in such a way that resulted
output is the difference of the voltages of
two windings.
13. Underlying Principle
Electromagnetic Induction:
Primary Coil (RED) is connected to power source
Secondary Coils (BLUE) are connected in parallel but with opposing
polarity
Primary coil’s magnetic field (BLACK) induces a current in the
secondary coils
Ferro-Metallic core (BROWN) manipulates primary’s magnetic field
14. Working in lvdt
As the primary is connected to an AC source
so alternating current and voltages are
produced in the secondary of the LVDT.
output in secondary S1 is e1 &in S2 is e2.
So the differential output
is, eout = e1 - e2
This equation explains the principle of Operation
of LVDT
15. CASE I When the core is at null position (for no
displacement) When the core is at null position then the
flux linking with both the secondary windings is equal so
the induced emf is equal in both the windings. So for no
displacement the value of output eout is zero as e1 and e2
both are equal. So it shows that no displacement took
place.
CASE II When the core is moved to upward of null
position (For displacement to the upward of reference
point) In the this case the flux linking with secondary
winding S1 is more as compared to flux linking with S2.
Due to this e1 will be more as that of e2. Due to this
output voltage eout is positive.
16. CASE III When the core is moved to downward of Null position (for
displacement to the downward of reference point) In this case magnitude of
e2 will be more as that of e1. Due to this output eout will be negative and
shows the output to downward of reference point.
20. Unguided Armature
There is no wear on the LVDT because no contact is made
between armature and bore.
LVDT does not restrict the resolution of measured data (“infinite
resolution”).
Elevation/Cross-Section
View
Measured Motion
21. Captive Armature
Body must be separately supported
Measured
Object
Armature must be attached to
the specimen
Armature is both guided and restrained by
a low friction assembly
22. Captive Armature
Advantages compared to unguided armature:
► Better for longer working rangesBetter for longer working ranges
►Preferred when misalignment may occurPreferred when misalignment may occur
24. ADVANTAGESOF LVDT:-
Robust; LVDT’s are robust equipment for measuring
deflection
LINEARITY:-The output voltage of LVDT is almost linear
for displacement up to 5 mm.
HIGH OUTPUT:-LVDT gives reasonably high output
and hence require less amplification afterwards.
HIGH SENSITIVITY:-LVDT has high sensitivity of about
300mV/mm i.e. 1mm of displacement of the core
produces a output voltage of300 mV,.
LESS FRICTION:-Since there are no sliding contacts,
the friction is very less.
LOW POWER CONSUMPTION:- Most LVDT’s consume
less than 1 W of power.
25. DISADVANTAGESOF
LVDT:-
Comparatively large displacements are necessary for
appreciable differential output.
They are sensitive to stray magnetic fields. However this
interference can be reduced by shielding.
Temperature affects the transducer.
26. Uses
Automation Machinery
Civil/Structural Engineering
Power Generation
Manufacturing
Metal Stamping/Forming
OEM
Pulp and Paper
Industrial Valves
R & D and Tests
Automotive Racing
Source:http://www.rdpe.com/ex/tips.htm
LVDT accessories tips
