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Understanding LVDT: Linear Position Sensor Technology

Learn all about LVDTs - from how they work and their types to advantages and characteristics. Discover the principles behind this robust position sensor.

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Understanding LVDT: Linear Position Sensor Technology

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  1. L V D Ts What is an LVDT? An LVDT is a Linear Position Sensor With a Proportional Analog Output An LVDT has 2 Elements, a Moving Core and a StationaryCoil Assembly

  2. L V D Ts Linear Variable Differential Transformer • Transformer: AC Input / AC Output • Differential: Natural Null Point in Middle • Variable: Movable Core, Fixed Coil • Linear: Measures Linear Position

  3. How LVDT’s Work

  4. Working principle of LVDT

  5. Types of LVDT’s • Unguided Armature • Captive Armature • Spring-extended Armature

  6. Unguided Armature Measured Object Armature must be attached to the specimen Armature fits loosely Body must be separately supported & properly aligned Elevation/Cross-Section View

  7. 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”). Measured Motion Elevation/Cross-Section View

  8. Captive Armature Measured Object Armature must be attached to the specimen Armature is both guided and restrained by a low friction assembly Body must be separately supported

  9. Captive Armature Advantages compared to unguided armature: • Better for longer working ranges • Preferred when misalignment may occur

  10. Spring-Extended Armature Measured Object Like the captive armature, it has a low-friction bearing assembly Internal spring to continuously push the armature to its fullest possible extension Elevation/Cross-Section View

  11. LVDT Characteristics

  12. DC LVDT

  13. Photograph of LVDT

  14. Summary • LVDT’s are robust equipment for measuring deflection. • AC LVDT’s require separate signal conditioning equipment, while DC LVDT’s include signal conditioning equipment on the device. • There are three types of LVDT: unguided armature, captive armature, and spring-extended armature. • AC LVDT’s cost less than DC, but the entire measurement system must be considered.

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