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displacement transducer

displacement transducer

Product catalog summary

Introduction
The sub-miniature gauging DVRT is designed for high performance in compact spaces, featuring a ruby bearing and stainless steel ball for smooth operation and resistance to side load. It offers sub-micron resolution, linear analog output, and low temperature coefficients, making it suitable for harsh environments like brake fluid and hot saline.

Features & Benefits

Sub-micron resolution with long stroke range
Operates up to 175°C
Frequency response up to 20 kHz
Lightweight core for minimal frequency response influence
Corrosion-resistant design for harsh environments
Waterproof and suitable for submersion
Frictionless design for high duty-cycle applications
Customizable for specific applications

Applications

Automotive and robotic control elements
Production-line process control
Quality control dimensional gauging
Strain and deflection measurement in materials science
Optical component positioning
Miniature force, torque, and acceleration sensors

Electrical Specifications

Linear Stroke Lengths: 4, 8, 24, 38 mm
Accuracy: ±1.0% (straight line), ±0.1% (polynomial)
Sensitivity: 1 volt/mm (8 mm stroke)
Signal to Noise: 4200 to 1 (filtered), 466 to 1 (unfiltered)
Resolution: 1.0 µm to 10 nm depending on version
Frequency Response: 800 Hz standard, 20 kHz optional
Temperature Coefficient: 0.002%/°C offset, 0.030%/°C span
Hysteresis and Repeatability: ±1 micron

Mechanical Specifications

Body Length: 30.5 mm to 183 mm depending on stroke
Diameter: 6.0 mm
Housing: 400 stainless steel
Core Material: Stainless steel
Bearing Material: Ruby and stainless steel
Operating Temperature: -55 to 175°C

How it Works
The DVRT detects core position by measuring differential reluctance using sinewave excitation and a synchronous demodulator, providing sensitive core position measurement while negating temperature effects. The coils and leads are sealed in epoxy within a stainless-steel case for environmental resistance, suitable for harsh applications like saline and pressurized oil immersion.

Catalog excerpts

Designed to get into tight spaces, the sub-miniature gauging DVRT delivers high performance in a small package. A ruby bearing and hardened stainless steel ball guide the spring- loaded tip, providing an exceptionally smooth static and dynamic response and resistance to side load.Features of the sub-miniature DVRTΒs include: sub-micron resolution, linear analog output, fl at dynamic response to kHz levels, and very low temperature coeffi cients. Extremely lightweight, captive cores are small yet rugged. Manufactured using corrosion-resistant alloys, the sub-miniature gauging DVRTs are suitable for submersion in harsh media such as brake fl uid and hot saline.Miniature plug and playӔ signal conditioners provide linear DC output when supplied with unregulated DC power. Multi- channel, OEM and digital display systems are also available.Custom ranges are available on request. available with sub-micron resolution and long stroke rangeՕ operating temperature to 175 C Е frequency response up to 20 kHz lightweight core will not infl uence frequency responseՕ stainless steel and high-performance polymer design suitable for extremely harsh environments waterproof, suitable for submersion in corrosive media such as brake fl uid and hot salineՕ frictionless design suitable for high duty-cycle applications easily customized to suit specifi c application > Օ miniature control elements for automotive and robotic systems process control for production-line monitoring Օ dimensional gauging for quality control applications measuring strain and defl ection in materials science and civil structuresՕ linear/angular positioning of optical components miniature force, torque, acceleration sensors >

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(obtained using MicroStrains DEMOD-DVRT) > U.S. Patent No. 4,813,435 and Patents Pending MicroStrain Inc. 310 Hurricane Lane, Unit 4 Williston, VT 05495 USA www.microstrain.com ph: 800-449-3878 fax : 802-863-4093 [email protected] > Copyright ک 2007 MicroStrain Inc. DVRT is a trademark of MicroStrain Inc. Specifi cations are subject to change without notice.Updated May 4, 2007

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