Products > LGDT

Linear Gap Displacement Transducer

Features

• Linear range up to 9mm
• Resolution between 0.1 μm and 1.0μm depending on Linear Range
• Non-contact position sensing
• Use with almost any target material
• Use with almost any target reflectivity
• Use in harsh environments
• Remote electronics via fiber-optic link
• Immunity to electric, RF, and magnetic fields

Principle of Operation

The LGDT measures the distance from the probe tip to a flat surface using a fiber-optic probe consisting of three concentric fiber rings. It illuminates the target surface, measures the reflected light, and derives a measurement of the distance to the target.

Typical Applications

• Fast-steering mirror displacement sensing
• Voice coil actuator closed-loop control
• Shaft levitation control in magnetic bearings
• Web position sensing in web processing
• Real-time concentricity measurements
• Bearing runout measurements
• Mechanical displacements under dynamic load
• Vibration measurements
• Structural deformation