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Non-Contact DVRT®

Non-Contact DVRT®
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LORD PRODUCT DATASHEET Non-Contact Displacement Sensor Ideal for difficult sensing applications, the Non-Contact DVRT® is designed to measure the displacement and proximity of a metal target without physical contact. The measurement is unaffected by interposed nonmetallic, nonconductive materials, such as polymers and biomaterials. The stainless shell of the device houses two coils; one for sensing and the other for temperature compensation. The coils and Teflon® cable are mounted on a stable PEEK substrate. This assembly is potted into the stainless housing using highgrade, vacuum-pumped epoxy and includes integral strain relief. This packaging allows the sensor to be used in applications requiring long-term immersion in water and saline solutions. Features & Benefits System Overview High Performance Sensor Design sub-micron resolution with large stroke/size ratio high dynamic range for difficult measurements Ease of Use non-contact position measurement plug and play usability easily customized to suit specific requirements signal conditioning options for any application Applications Process Control for Production-Line Monitoring Miniature Position Control Elements Linear & Angular Motion Control Measuring Strain and Deflection in Materials and Structures Dimensional Gauging for Quality Control Two coils within the Non-Contact DVRT® housing form its sensing and compensation elements. When the face of the transducer is brought into close proximity to a ferrous or highly conductive ‘target’ 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 sine wave excitation and their differential reluctance is measured using a synchronous 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 circuit’s 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. LORD MicroStrain®’s desktop consoles and in-line signal conditioners provide the Non-Contact DVRT® with plug and play housing, power, analog output, LCD display, RS-232 output and software. Custom ranges are available on request.

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NC- DVRT® Non-Contact Displacement Sensor Electrical Specifications (Obtained using DEMOD-DVRT® and DVRT® wth 800 Hz lowpass filter at constant temperature) MicroStrain®, S-DVRT® SG-DVRT® M-DVRT® MG-DVRT® NC-DVRT®, DEMOD-DC® and DEMOD-DVRT® are trademarks of LORD MicroStrain®, Specifications are subject to change without notice. LORD Corporation MicroStrain® Sensing Systems Patent(s) or Patent(s) Pending

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