LVDT (Linear Variable Differential Transformer), is an absolute position/displacement transducer that will convert a position or linear displacement from a mechanical reference (zero, or null position) into a proportional electrical signal containing phase (for direction) and amplitude (for distance) information. The LVDT operation does not require an electrical contact between the moving part (probe or core assembly) and the coil assembly to work, but instead relies on electromagnetic coupling; this and the fact that LVDTs can operate without any built-in electronic circuitry are the primary reasons why they have been widely used in applications where long life and high-reliability equipment under very severe environmental conditions as required, such as in Military/Aerospace, process controls, automation, robotics, nuclear, chemical plants, hydraulics, power turbines, and many others. LVDT’s come in two different ranges, either DC or AC output. DC versions, in general, have integral electronics or there is limited need for complex signal conditioning or AC variants which will require signal conditioning. There are lots of object application-based uses for an LVDT device, as they are not electromechanical there are many good uses for many devices.
Frequently Asked Questions about Linear Potentiometers
The actual acronym for is Linear Variable Differential Transformer. It is a common type of electromechanical transducer that can convert the linear motion of an object to which it is coupled mechanically into a corresponding electrical signal. Other acronyms are Linear Variable Differential Transducer, Linear Variable Displacement Transducer but in essence they are all the same meaning.
Principally, LVDTs (Linear Variable Differential Transformer) is used the measure linear displacement. There are many different variants available, but an LVDT can have a separate core making the sensor non-wearing and have a very long cycle life or used for extreme cycle applications. Some LVDTs are designed for very high temperatures to 550 Deg C.
LVDT Position sensors have many applications not limited to Civil/Structural monitoring, seafloor wellheads, oil & gas platforms, desalination systems and satellite controls. Special versions can be used for Steam or Gas turbines, high nuclear/radiation environments, subsea & marine.
Advantages include low power consumption, no friction losses as non-contact, very high resolution. Disadvantages include the need for additional set up compared to other devices, extra signal conditioning, large size relative to measurement, can be affected by external factors such as temperature.