Robust and highly accurate displacement sensor with submicron resolution and non-contact position measurement.
The NC-LVDT is a non-contact displacement sensor in a very compact body. Ideal for difficult applications with high load changes. Our NC-LVDT displacement transducers feature resolutions from micrometer to nanometer range. In combination with MicroStrain demodulators, they provide a linear frequency response down to the kilohertz range.
Miniature "Plug & Play" demodulators provide a linear DC output voltage, even at unregulated supply voltage. Systems with digital display, OEM and multichannel demodulators are also available.
Features
- Submicron resolution with large stroke/size ratio
- High dynamic range for difficult measurements
- Non-contact position measurement
- Robust and waterproof
How it works
Two coils within the non-contact LVDT's housing form its sensing and compensation elements. When the face of the transducer is brought in close proximity to a ferrous or highly conductive material, the reluctance of the sense coil is changed, while the compensation coil acts as a reference.
The coils are driven by a high frequency sinewave excitation, and their differential reluctance is measured using a sensitive demodulator. Differencing the two coils outputs provides a sensitive measure of the position signal, while cancelling out variations caused by temperature.
Ferrous targets change the sense coils' reluctance by altering the magnetic circuits permeability; conductive targets (such as aluminum) operate by the interaction of eddy currents induced in the target's skin with the field around the sense coil.
Applications
- Process control for production line monitoring
- Miniature position control elements
- Linear and angular motion control
- Dimensional gauging for quality control
