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What Is LVIT And Where Does It Fit Into The Sensor World?

February 4, 2016 By: Harold Schaevitz

Sensors Insights by Harold Schaevitz

What It Is

What is LVIT Technology? LVITs, Linear Variable Inductive Transducers, have been around for more than 30 years, and are a disruptive technology due to their relatively low cost and flexibility to be packaged in many different forms. LVITs are contactless position sensing devices that utilize eddy currents developed by an inductor in the surface of a conductive movable element to vary the resonant frequency of an L-C tank circuit.

The most common form of an LVIT uses a small diameter inductive probe surrounded by a conductive tube called a "spoiler" that is mechanically coupled to the moving object. Typical LVITs have full ranges from fractions of an inch to 30 or more inches. Modern electronics using microprocessors and small component size makes outstanding performance possible, achieving linearity errors of less than ±0.1% and temperature coefficients of 50 ppm/°F, along with either analog or digital outputs. The range of housing sizes for LVITs can be seen in Figure 1 and a cutaway view of an LVIT can be seen in Figure 2.

Figure 1
Figure 1

Figure 2
Figure 2

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About the Author: Harold Schaevitz

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