Microminiature Differential Variable Reluctance Transducer

Ideal for critical linear displacement measurements, the DVRT delivers high performance in a tiny package. Advanced materials and electronics have resulted in a rugged, fast, and sensitive instrument, capable of submersion in aqueous environments. The DVRT provides micron to sub-micron resolution , linear analog output, flat dynamic response to kHz levels, and very low temperature coefficients. Free-sliding transducer cores are extremely lightweight; and utilize flexible, elastic, biocompatible alloys to provide resistance to kinking and permanent deformation. The DVRT comes with an integral strain relieved, flex circuit and connector. As with all MicroStrain products, every device is carefully tested prior to shipment, and calibration data are included with each order.

Customization
A range of stroke lengths and specialized, modular attachments have been developed. Longer stroke lengths provide greater linearity; DVRTs with nonlinearities as low as +/- 0.15% are available. Signal conditioners are provided in multichannel "plug and play" enclosures, w/ cables and UL approved power supply. Miniature circuit cards are also available for high volume OEM customers.

How It Works
Core position is detected by measuring the coils' differential reluctance, using a sinewave excitation and synchronous demodulator. This differential method provides a sensitive measure of core position, while canceling out temperature effects. The transducers' coils and flex circuit leads are sealed in vacuum pumped epoxy, within the stainless steel case, providing outstanding environmental resistance. The DVRT has been successfully employed in harsh applications, including immersion in saline and pressurized oil.

MicroStrain, Inc., 294 N. Winooski Ave., Burlington, VT 05401-3680. Tel: 802-862-6629; Fax: 802-863-4093.