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Microminiature Gauging DVRT®
The World's Smallest Linear Gauge!
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
- Low-friction design suitable for high duty-cycle applications
- Easily customized to suit specific application
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Description
Designed to get into tight spaces, the microminiature gauging DVRT® delivers high
performance in a tiny package. A sapphire bearing and ruby ball guide the spring-loaded
tip, providing an exceptionally smooth static and dynamic response.
Features of micro-gauging DVRTs® include: micron to sub-micron resolution, linear
analog output, flat dynamic response to kHz levels, and very low temperature coefficients.
Extremely lightweight, captive cores are tiny yet rugged. Super-elastic, corrosion-resistant
alloys provide resistance to kinking and permanent deformation, and allow
complete submersion of the instrument.
Micro-gauging DVRTs® are ideal for applications requiring closely spaced sensing
arrays. Sensor arrays of only 5 mm center-to center spacing can be readily implemented
with our clamping collar mounting system. This system also protects the sensor and
test items from excess applied force or over-range displacement.
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.
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 transducer's coils and multistranded 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. |
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 (with MicroStrain® DVRT® demodulator)
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Linear Stroke Lengths |
3, 6 & 9 mm (standard version) 1.5 mm (high resolution version) |
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Accuracy* |
± 1.0% using straight line ± 0.1% using polynomial |
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Sensitivity |
2 volts/mm typical |
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Signal to noise |
2000 to 1 (with filter 3 dB down at 800 Hz, standard)
600 to 1 (unfiltered) noise measured peak to peak |
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Resolution (0.05% of full scale for standard version) |
1.5 µm for 3 mm stroke
3.0 µm for 6 mm stroke
4.5 µm for 9 mm stroke
300 nm for high resolution version |
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Frequency response |
7 Khz (unfiltered) |
Temp. coeff. offset
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.0029% / degree C |
Temp. coeff. offset
span |
0.0029%/ °C
0.030%/ °C |
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Hysteresis* |
± 1 micron |
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Repeatability* |
± 1 micron |
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Cycle life |
Fully operational after >20 million cycles to full scale displacement |
* at constant temperature
Mechanical Specifications
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Overall length |
20 mm plus 3 times stroke |
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Outside diameter |
1.8 mm (smooth body) |
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Spring stiffness |
0.2 Newtons/mm (1 lb/inch) |
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Bearing materials |
Sapphire and ruby on stainless |
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Standard core tips |
1.5 mm ruby ball, 1.5 mm sapphire cup, sapphire stylus with 60 micron tip radius |
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Housing material |
Stainless steel, smooth body, or 8-32/10-32 400 series stainless steel threaded body |
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Mounting system |
Clamping collar or threaded body |
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Sensor spacing |
5.0 mm minimum center-to-center with smooth body & clamping collar mounting system |
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Leadouts |
45 cm multistranded, shielded, stainless steel reinforced, teflon insulated |
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Connector |
Keyed Lemo 4-pin, polyolefin relief |
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Operating Temp |
-55 to 105 degrees C standard, -55 to 175 degrees C optional |
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Core weight |
30 milligrams, w/ruby tip and bearing |
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Core material |
Superelastic NiTi alloy |
U.S. Patent 4,813,435 and Patents Pending
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General Documentation
FAQ's
Mechanical Prints
Support Electronics
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Please enter your Contact information.
When finished, click SUBMIT button at bottom of page.
To better serve your needs, the fields marked * indicate required information.
Gauging (with Internal Spring) Displacement Starter Kits
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3 millimeter stroke, DC input/DC output Microminiature Gauging Starter Kit
MG-DVRT-3-SK1
Includes
(1) MG-DVRT-3, (1) DEMOD-DC
Part Number: 61030-0031
Online price: $1170.00
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Part Number: 61030-0031
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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