The LVDT is an inductive transducer that converts linear motion to electrical signals. It consists of a primary winding and two secondary windings placed on either side of the primary. A movable soft iron core is placed between the windings. As the core moves linearly, it induces changing voltages in the secondary windings. The difference between these voltages is proportional to the core's displacement, allowing the LVDT to accurately measure linear motion over a wide range. LVDTs have advantages like high sensitivity and ruggedness, but disadvantages such as sensitivity to stray magnetic fields. They are commonly used as secondary transducers to measure quantities that involve linear displacement.
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
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
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
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 .
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET). It has an insulated gate, whose voltage determines the conductivity of the device. This ability to change conductivity with the amount of applied voltage can be used for amplifying or switching electronic signals. Although FET is sometimes used when referring to MOSFET devices, other types of field-effect transistors also exist.
Potentiometers are variable resistance devices. A change in the linear or angular displacement of a potentiometer varies the effective length of its conductor, and therefore the resistance of the device.
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
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 .
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET). It has an insulated gate, whose voltage determines the conductivity of the device. This ability to change conductivity with the amount of applied voltage can be used for amplifying or switching electronic signals. Although FET is sometimes used when referring to MOSFET devices, other types of field-effect transistors also exist.
Potentiometers are variable resistance devices. A change in the linear or angular displacement of a potentiometer varies the effective length of its conductor, and therefore the resistance of the device.
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
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
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1. PRESENTATION
ON
Linear Variable Differential Transformer
(LVDT)
PRESENTED BY -
Vishal Thakur
100104143
B.Tech (E.E) 2nd Year
Section B
2. Construction
The most widely used inductive transducer to translate linear motion to electrical signals.
The transformer consist of a primary winding (P) and two secondary windings (S1 and S2)
The secondary windings (S1 and S2) have equal number of turns and are identically placed
on either side of primary winding. The primary winding is connected to an alternating
current source.
3. Working
A moveable soft iron core is placed between the windings.
The frequency of a.c applied to primary windings may be between 50 Hz to 20 kHz .
4. As the primary winding is excited by an alternating current source , it produces an alternating
magnetic field which in turn induces alternating current voltages in the two secondary
windings.
The output voltage of secondary S1 is Es1 and that of S2 is Es2 . In order to convert the
Outputs from S1 and S2 into a single voltage signal , the two secondaries S1 and S2 are
connected in series opposition.
5. The output voltage of the transducer is the difference of two voltages .
The amount of voltage change in either secondary winding is proportional to the amount of
movement of the core. Hence we have an indication of amount of linear motion.
By noting which output voltage is increasing or decreasing , we can determine the direction
of motion.
In other words , any physical displacement of the core causes the voltage of one secondary
winding to increase while simultaneously educing the voltage in other secondary winding.
The amount of output voltage is measured to determine the displacement.
6. The output voltage of a LVDT is a linear function of core displacement within a limited
range of motion .
The curve is practically linear for small displacements . Beyond this range of displacement ,
the curve starts to deviate from a straight line .
Ideally output voltage at null position should be zero , but there is some residual voltage
due to harmonics
7. Advantages
• High range
• Frictional and Electrical isolation
• Immunity from External Effects
• High input and output sensitivity
• Ruggedness (tolerate high degree of shock and vibrations)
• Low Hysteresis
• Low Power consumption
8. Disadvantages
• Relatively large displacements required
• Sensitive to stray magnetic fields
• May be affected by vibrations
• Operates only on a.c. signals
• Affect of temperature
Uses
• Works on wide ranges ; from fraction of mm to a few cm
• Mechanical signal converted directly into analogous Electrical signal
• Mostly used as secondary transducer
• Can be used to measure force , weight and pressure etc.
9. Errors and Adjustments
• Nikel iron is used generally in place of soft iron to get low harmonics , low null
voltage and high sensitivity.
• Core is slotted longitudinally in LVDT to reduce eddy current losses.
• Placed in stainless steel housing and end lids provides electrostatic and
electromagnetic shielding.