S-DVRT Subminiature Displacement Sensors (0.5 ... 38 mm)

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Sub- and Microminiature Displacement Transducers by MicroStrain
Displacement Transducers by Kyowa

Miniature displacement sensors - DVRTs, include gauging, non-gauging (free sliding core) and non-contact displacement transducers.

The product line includes sub-miniature displacement sensors, micro-miniature displacement sensors, and miniature non-contact displacement sensors.

For linear control and precision measurement applications, subminiature DVRTs feature a fast response and rugged packaging.

Description
The Subminiature DVRT is a larger version of our Microminiature DVRT. It features an outside body diameter of 4.76mm. Three stroke lengths of 8, 24, and 38mm are available from stock. Custom stroke lengths, smaller body length to stroke ratios, hermetic packaging, and high temperature options (up to 175 degrees C) are also available. The Subminiature DVRT features a resolution of 0.16 microns (-3dB @ 1KHz); high resolution and nano resolution devices (down to 10 nanometers over 200 microns of stroke) are also available.

A DVRT consists of two coils which measure the linear movement of a ferrite core. The 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 Teflon 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.

Several attachment options are available from stock: threaded body, threaded core, spring tips, mounting blocks, and a gauging option.

All of our subminiature displacement sensors are precision layer wound for enhanced linearity, repeatability and stability.

Applications
quality control
gauging, dimensional checking

materials science, civil engineering
measuring & monitoring structural deflections

automotive, aerospace
pneumatic & hydraulic control position control & feedback

robotics
niature control systems, linear & angular position feedback

miniature sensors
mirror positioning

semiconductor lithography
precise locating of linear stages

Customer Applications

• Robotic Fish
• Future Missions
• Water Trials
• Video of Robotic Fish (RAM)