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What is an LVDT?

What is an LVDT?

What is an LVDT?

An LVDT is a Linear Variable Differential Transformer and is a type of non-contacting position sensor used to measure linear displacement – distance travelled in a straight line. The LVDT will convert the linear displacement from the mechanical reference point into a proportional electrical signal which contains phase (direction) and amplitude (distance).

LVDT Construction

An LVDT consists of a transformer and a probe assembly, it has seven main components

1.       Primary coil

2.       Secondary coil 1

3.       Secondary coil 2

4.       Ferromagnetic core – or slug

5.       Tube – or bobbin

6.       Shield

7.       Shaft

The ferromagnetic core moves within the component and the position is sensed. The primary coil windings are centred between two symmetrical identical secondary windings, each secondary coil need to have the same number of turns and be the same length so that the reference point is not affected by these. The windings are encased in a cylindrical shield for protection. 

Why Use an LVDT?

There are many benefits to using an LVDT

Robust – LVDTs are rugged and durable which means that they are able to withstand harsh conditions. They are moisture and humidity resistant because of their epoxy encapsulation.

Minimal friction– there is no mechanical contact between the core and the coil assembly in an LVDT which means that there is minimal friction and therefore no wear and tear on the parts.

Long life – because of the minimal friction, LVDTs have a long life as there are no mechanical failures.

Fast response – the fast response times are also because of the friction free operation.

What are LVDTs used for?

LVDTs are often used within the aerospace, industrial and military sectors for a wide range of applications involving position sensing. Some more specific applications include;

·         Process and control

·         Servo mechanisms

·         Pressure chambers and vessels

·         Materials testing

·         Factory automation

·         Large misalignment applications

·         General industrial applications

·         Continuous casting mould clamping

·         Applications with weight sensitivity

LVDT sensors from Ixthus

Our LVDT sensors can be found on our Non contacting Linear Position Sensors page. Our range includes AC and DC LVDTs as well as spring returns and transmitter systems.

If you require more information on LVDTs please contact us +44(0)1327 351004 or

For more information please contact: Ixthus Instrumentation Email: Tel:+44 (0) 1327  353437 Fax: +44 (0) 1327 353564

Article date: Mon, 07 Jan 2019 08:43:19 +0000 GMT

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Title:What is an LVDT?



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