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TEST AND MEASUREMENT SENSORS AND SYSTEMS
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​LVDT Sensors; What they are and How They Work.

​LVDT Sensors; What they are and How They Work.

LVDT sensors are a type of position sensor. LVDT stands for Linear Variable Differential Transformer. It is a displacement measuring instrument.

An LVDT sensor will convert the rectilinear motion of an object into a corresponding electrical signal. They can measure movements smaller than a millimetre.

The Construction of an LVDT Sensor

LVDT sensors consist of a primary winding centred between a pair of identical secondary windings which are placed symmetrically around the primary. These are wound round a core and the whole structure is encased in stainless steel housing. The core does not touch the windings.

The primary windings are energised with constant amplitude which produces an alternating magnetic field in the centre of the transducer which induces a signal in the secondary windings depending on what position the core is in. The movement of the core will cause the secondary signal to change, the secondary output signal is processed giving an output proportional to the core movement and indicating the direction of movement of the core.

The Benefits of using LVDT Sensor

There are many benefits of using an LVDT sensor;

Friction Free

An LVDT sensor is friction free, there is no mechanical contact between the core and the coil assembly therefore there is no wear on the sensor itself. This gives the LVDT sensor outstanding repeatability and infinite resolution and unlimited mechanical life. This makes them well suited to applications where reliability is very important such as nuclear installations, satellite and space vehicles and air craft applications.

Fast Response

Because there is no contact or friction within the sensor itself, LVDTs tend to offer very quick response times.

Robust; for Extreme Environments.

LVDTs are generally rugged, durable sensors which are robust and can survive in a variety of environmental conditions. The epoxy encapsulation results in a moisture and humidity resistant structure. The case and the core are constructed of corrosion resistant materials and the case can be hermetically sealed meaning the sensor can be exposed to flammable or corrosive liquids. LVDTs can also be constructed of different materials which will make them operational at high temperatures where needed.

LVDT sensors from Ixthus

We have a range of LVDT sensors available for you to view on our website . If you need more information please contact use using the details above. 

For more information please contact: Ixthus Instrumentation Email: sales@ixthus.co.uk Tel:+44 (0) 1327  353437 Fax: +44 (0) 1327 353564

Article date: Thu, 10 Mar 2016 11:24:23 +0000 GMT

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