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Subminiature DVRT®
Differential Variable Reluctance Transducer (or "half bridge LVDT")
- Available with sub-micron resolution and long stroke range
- Operating temperature to 175°C
- Frequency response up to 20 kHz
- Lightweight core will not influence frequency response
- Stainless steel and high-performance polymer design suitable for extremely harsh
environments
- Waterproof, suitable for submersion in corrosive media such as brake fluid and hot
saline
- Frictionless design suitable for high duty-cycle applications
- Easily customized to suit specific application
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Description
Ideal for linear control and precision measurement applications, the subminiature
DVRT® features a fast response and rugged packaging. The sensing head is also capable
of total submersion in aqueous environments.
Features of our subminiature DVRT®s include micron resolution, linear analog output,
flat dynamic response to kHz levels, and very low temperature coefficients. Free
sliding transducer cores are 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 fit allows the DVRT® to achieve
extremely high repeatability. Custom strokes are also available.
Miniature "plug and play" signal conditioners provide linear DC output when supplied
with unregulated DC power. Multichannel, OEM and digital display systems are also
available.
How it works
Core position is detected by measuring the coils' differential reluctance, using
a sinewave 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 flex circuit leads 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 immersion in saline
and pressurized oil.
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Applications
Miniature control elements for automotive and robotic systems
Process control for production-line monitoring
Dimensional gauging for
quality control applications
Measuring strain and deflection in
materials science and civil structures
Linear/angular positioning of optical components
Miniature force, torque, acceleration sensors
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Electrical Specifications (obtained using MicroStrain's DEMOD-DVRT)
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Linear Stroke Lengths |
4, 8, 24, 38 mm (standard resolution) |
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6 mm (high resolution) |
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500 µm or less (nano resolution) |
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Accuracy* |
±1.0 % using straight line
±0.1 % using polynomial |
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Sensitivity |
1 volt/mm typ. (for 8 mm stroke) |
Signal to noise
(using DEMOD-DVRT) |
4200 to 1 (with filter 3 dB down at 800 Hz, standard resolution),
466 to 1 (unfiltered) |
Resolution
(0.025% of full scale for standard version) |
1.0 µm for 4 mm stroke |
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2.0 µm for 8 mm stroke |
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6.0 µm for 24 mm stroke |
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9.5 µm for 38 mm stroke |
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0.6 µm for high resolution version |
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10 nm for nano resolution version |
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Frequency response |
800 Hz standard, 20 KHz optional |
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Temp. coeff. offset |
.002% / °C (typical) |
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Temp. coeff. span |
.030% / °C (typical) |
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Hysteresis* |
± 1 micron |
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Repeatability* |
± 1 micron |
* at constant temperature
Mechanical Specifications
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Overall body length |
approx. 3.5 times stroke |
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18.5 mm for 4 mm stroke |
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34.5 mm for 8 mm stroke |
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81 mm for 24 mm stroke |
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124 mm for 38 mm stroke |
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Outside Diameter |
4.76 mm (3/16 inch) |
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Housing |
300 stainless steel, smooth 5/16 - 24 threaded 400 stainless steel(optional) |
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Leadouts |
45 cm multistrand, shielded, stainless steel reinforced teflon insulated cable |
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Connector |
Keyed Lemo 4-pin |
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Operating temperature |
-55 to 175˚C |
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Core weight |
350 mg (for 8 mm stroke) |
U.S. Patents 5497147, 5777467, 5914593 and Patents Pending
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General Documentation
FAQ's
Mechanical Prints
Support Electronics
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Temperature Drift Compensated DVRT® Displacement Starter Kits
MicroStrain has identified your location as
United States. If this is incorrect please contact
sales at 802-862-6629 or sales@microstrain.com
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8mm stroke Subminiature DVRT Starter Kit with One Channel
S-DVRT-8-SK1
Includes
(1) S-DVRT-8, (1) CBL1, (1) DEMOD-DVRT-TC, (1) MB-STD-4
Part Number: 6105-0111
Online price: $1205.00
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Subminiature DVRT Starter Kit with Two Channels
S-DVRT-8-SK2
Includes
(2) S-DVRT-8, (2) CBL1, (2) DEMOD-DVRT-TC, (1) MB-STD-4
Part Number: 6105-0112
Online price: $2185.00
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Subminiature DVRT Starter Kit with Three Channels
S-DVRT-8-SK3
Includes
(3) S-DVRT-8, (3) CBL1, (3) DEMOD-DVRT-TC, (1) MB-STD-4
Part Number: 6105-0113
Online price: $3165.00
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Subminiature DVRT Starter Kit with Four Channels
S-DVRT-8-SK4
Includes
(4) S-DVRT-8, (4) CBL1, (4) DEMOD-DVRT-TC, (1) MB-STD-4
Part Number: 6105-0114
Online price: $4145.00
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