Differential Variable Reluctance Transducer (or "half bridge LVDT")
Ideal for linear control and precision measurement applications, the Subminiature DVRT® provides fast response and rugged packaging. The Subminiature DVRT® features micron resolution, linear analog output, flat dynamic response to kHz levels, and very low temperature coefficients. Its free sliding transducer core is lightweight, strong, and corrosion resistant. Cores are precision ground to insure a close sliding fit within the open bore of the stainless-steel lined DVRT® body. This precision allows the DVRT® to achieve extremely high repeatability. The sensing head is capable of total submersion in aqueous environments.
Core position is detected by measuring the coils’ differential reluctance using a sine wave excitation and synchronous demodulator. This differential detection method provides a very sensitive measure of core position while cancelling out temperature effects.
The transducers’ coils and Teflon® cables are sealed in vacuum-pumped epoxy, within the stainless-steel case. This provides outstanding environmental resistance. The DVRT® has been successfully employed in harsh applications, including short term immersion in saline and pressurized oil.
Units available for long term immersion, corrosive and high pressure environments can be custom built to meet such requirements. LORD MicroStrain®’s desktop consoles and in-line signal conditioners provide the Subminiature DVRT® with plug and play housing, power, analog output, LCD display, RS-232 output and software. A range of modular positioning attachments and custom strokes are also available.
Features and Benefits
- sub-micron resolution with large stroke/size ratio
- frictionless design for robust use over millions of cycles
- suitable for use in harsh fluids and environments
- high dynamic range for difficult measurements
Ease of Use
- plug and play usability
- easily customized to suit specific requirements
- signal conditioning options for any application