Micro-Miniature DVRT® :: MicroStrain® Miniature LVDT Displacement Transducer

Description

Ideal for critical linear displacement measurements, the microminiature 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.

Features

Features of our microminiature DVRTs® include micron to submicron 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, bio-compatible alloys to provide resistance to kinking and permanent deformation.

Customization

A range of stroke lengths and specialized, modular attachments have been developed. Longer stroke lengths provide greater linearity DVRTs® with nonlinearity as low as ± 0.15%. This performance, combined with versatility of design allows the microminiature DVRT® to meet the needs of a wide variety of applications.

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.

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

Biomedical sensors for measuring strain in bone and soft tissue

Electrical Specifications (obtained using MicroStrain's DEMOD-DVRT)

Linear Stroke Lengths

3 , 6 & 9 mm (standard versions)

1.5 mm (high resolution version)

Accuracy*

± 1.0% using straight line

± 0.1% using polynomial

Sensitivity

2 volts/mm typical

Signal to noise

2000 to 1 (with filter 3 dB down at 800 Hz, standard)

Resolution (0.05% 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

Frequency response

7 Khz (unfiltered)

Temp. coeff. offset
span

0.0029%/degree C

Temp. coeff. span

0.030%/°C

Hysteresis*

± 1 micron

Repeatability*

± 1 micron

* at constant temperature

Mechanical Specifications

Overall length

2.7 times linear stroke
18.7 mm for 6 mm stroke
26.8 mm for 9 mm stroke
11.3 mm for high resolution version

Gauge length

Adjustable, 1.5 mm minimum

Outside diameter

1.5 mm (standard version)

1.8 mm (high resolution)

Housing material

Smooth stainless steel , 4-40, 6-32 & 8-32 threaded options

Attachment method

Stainless steel clamp, screws or barbs

Leadouts

45 cm, multi stranded, shielded, stainless steel reinforced, Teflon insulated

Connector

Keyed Lemo 4-pin with polyolefin relief

Operating Temperature

-55 to 175˚C

U.S. Patents 4813435, 5497147, 5777467, 5914593 and Patents Pending

General Documentation

Microminiature DVRT® Product Datasheet

Mechanical Prints

Microminiature DVRT® - print which details stroke length and body length
Microminiature DVRT® threaded core - print of DVRT® with a threaded core option
Microminiature DVRT® threaded body - print of DVRT® with threaded body options
Pressure equalized DVRT® - integral connector, pressure equalization portals, threaded attachment
Pressure equalized DVRT® mounting configurations - print showing a possible mounting configuration

FAQ's

Displacement FAQ

Attachments

DVRT® body attachment (M-ATT-B3 and M-ATT-C3)
DVRT® core attachment (M-ATT-B3 and M-ATT-C3)
Orthopaedic attachment - barbed point illustration
DVRT® attachment station - steel block used to hold DVRT® for M-ATT-B3 and M-ATT-C3 attachment

Support Electronics

System requirements - electronics needed for DVRT® use
System chart - system illustration showing items needed for system specification

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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
	3mm stroke Microminiature DVRT Starter Kit with One Channel M-DVRT-3-SK1 Includes (1) M-DVRT-3, (1) CBL1, (1) DEMOD-DVRT-TC, (1) MB-STD-4 Part Number: 6101-0111 Online price: $1625.00	3mm stroke Microminiature DVRT Starter Kit with Two Channels M-DVRT-3-SK2 Includes (2) M-DVRT-3, (2) CBL1, (2) DEMOD-DVRT-TC, (1) MB-STD-4 Part Number: 6101-0112 Online price: $3025.00

	3mm stroke Microminiature DVRT Starter Kit with Three Channels M-DVRT-3-SK3 Includes (3) M-DVRT-3, (3) CBL1, (3) DEMOD-DVRT-TC, (1) MB-STD-4 Part Number: 6101-0113 Online price: $4425.00	3mm stroke Microminiature DVRT Starter Kit with Four Channels M-DVRT-3-SK4 Includes (4) M-DVRT-3, (4) CBL1, (4) DEMOD-DVRT-TC, (1) MB-STD-4 Part Number: 6101-0114 Online price: $5825.00

Biomechanics Strain/Displacement Starter Kits
	Biomechanics Microminiature DVRT Starter Kit with One Channel M-DVRT-3-BX-SK1 Includes (1) M-DVRT-3, (1) CBL1, (1) DEMOD-DVRT, (1) MB-STD-4, (1) M-ATT-B3, (1) M-ATT-C3, (2) BARB1, (1) INS2, (1) M-ABLOCK Part Number: 6101-0191 Online price: $2035.00	Biomechanics Microminiature DVRT Starter Kit with Two Channels M-DVRT-3-BX-SK2 Includes (2) M-DVRT-3, (2) CBL1, (2) DEMOD-DVRT, (1) MB-STD-4, (2) M-ATT-B3, (2) M-ATT-C3, (4) BARB1, (1) INS2, (1) M-ABLOCK Part Number: 6101-0192 Online price: $3605.00

	Biomechanics Microminiature DVRT Starter Kit with Three Channels M-DVRT-3-BX-SK3 Includes (3) M-DVRT-3, (3) CBL1, (3) DEMOD-DVRT, (1) MB-STD-4, (3) M-ATT-B3, (3) M-ATT-C3, (6) BARB1, (1) INS2, (1) M-ABLOCK Part Number: 6101-0193 Online price: $5175.00	Biomechanics Microminiature DVRT Starter Kit with Four Channels M-DVRT-3-BX-SK4 Includes (4) M-DVRT-3, (4) CBL1, (4) DEMOD-DVRT, (1) MB-STD-4, (4) M-ATT-B3, (4) M-ATT-C3, (8) BARB1, (1) INS2, (1) M-ABLOCK Part Number: 6101-0194 Online price: $6745.00

Microminiature DVRT®

The World's Smallest Linear Displacement Sensor!

Temperature Drift Compensated DVRT® Displacement Starter Kits

Biomechanics Strain/Displacement Starter Kits