Next Generation Displacement Sensors Provide High Resolution in a Miniature Package MicroStrain Inc Mike Robinson May 2010 Copyright 2010 MicroStrain Inc Subminiature Gauging DVRT Gauging unit Gauging unit Stroke 4, 8, 24, 38 mm Stroke 4, 8, 24, 38 mm Diameter 6 mm Diameter 6 mm Resolution 1 to 9.5 microns (depending on range) Resolution 1 to 9.5 microns (depending on range) Repeatability 1 micron Repeatability 1 micron Frequency response 800 Hz standard, up to 20 KHz optional Frequency response 800 Hz standard, up to 20 KHz optional High resolution versions 0.6 micron and 10 nanometer High resolution versions 0.6 micron and 10 nanometer Copyright 2009 MicroStrain Inc Subminiature DVRT Free-sliding core Free-sliding core Stroke 4, 8, 24, 38 mm Stroke 4, 8, 24, 38 mm Diameter 4.76 mm Diameter 4.76 mm Resolution 1 to 9.5 microns (depending on range) Resolution 1 to 9.5 microns (depending on range) Repeatability 1 micron Repeatability 1 micron Frequency response 800 Hz standard, up to 20 KHz optional Frequency response 800 Hz standard, up to 20 KHz optional High resolution versions 0.6 micron and 10 nanometer High resolution versions 0.6 micron and 10 nanometer Copyright 2009 MicroStrain Inc Microminiature Gauging DVRT Gauging Unit Gauging Unit Stroke 3, 6, 9 mm Stroke 3, 6, 9 mm Diameter 1.8 mm Diameter 1.8 mm Resolution 1.5 to 4.5 microns (depending on range) Resolution 1.5 to 4.5 microns (depending on range) Repeatability 1 micron Repeatability 1 micron Frequency response 800 Hz standard, up to 20 KHz optional Frequency response 800 Hz standard, up to 20 KHz optional High resolution version 300 nanometer High resolution version 300 nanometer Copyright 2009 MicroStrain Inc Microminiature DVRT Free-sliding core Free-sliding core Stroke 3, 6, 9 mm Stroke 3, 6, 9 mm Diameter 1.5 mm Diameter 1.5 mm Resolution 1.5 to 4.5 microns (depending on range) Resolution 1.5 to 4.5 microns (depending on range) Repeatability 1 micron Repeatability 1 micron Frequency response 800 Hz standard, up to 20 KHz optional Frequency response 800 Hz standard, up to 20 KHz optional High resolution version 300 nanometer High resolution version 300 nanometer Copyright 2009 MicroStrain Inc Non-Contact DVRT Range 0.5 to 2.5 mm Range 0.5 to 2.5 mm Diameter 2.84 to 12.7 mm Diameter 2.84 to 12.7 mm Resolution 0.1% F.S Resolution 0.1% F.S Repeatability 2 micron Repeatability 2 micron Frequency response 800 Hz Frequency response 800 Hz Copyright 2009 MicroStrain Inc Signal Conditioners Copyright 2009 MicroStrain Inc DEMOD-DC Standalone Standalone Output 0 to 5 volts Output 0 to 5 volts Power 6 to 16 volts Power 6 to 16 volts Copyright 2009 MicroStrain Inc DEMOD-DVRT Requires Motherboard Requires Motherboard Output 5 volts Output 5 volts Power 6.5 to 16 volts Power 6.5 to 16 volts Copyright 2009 MicroStrain Inc DEMOD-DVRT-TC Requires Motherboard Requires Motherboard Output 5 volts Output 5 volts Power 6.5 to 16 volts Power 6.5 to 16 volts Temperature compensated for offset drift Temperature compensated for offset drift Copyright 2009 MicroStrain Inc Ligament Strain Measurement Arthroscopically implanted Suture-less attachment Beynnon et al. J Bone Joint Surg 1992 Beynnon et al. Amer J Sports Med 1996 Fleming et al. Amer J Sports Med 2000 Wireless DVRTs for Lamb Growth Plate Monitoring In Vivo (Wilsman et al, UW Madison) Bone Elongation Occurs During Recumbency and Not During Standing/Ambulation Electronic Valve Control Improved fuel economy % Increased low speed torque % Reduced emissions MIT Technology Review, Nov 2002 Test & Measurement Quality Control LaPlatte River Bridge - Requirements Dynamic monitoring system Dynamic monitoring system Quick and easy to deploy Quick and easy to deploy Magnetically mounted strain gauges Wireless data acquisition system Copyright 2008 MicroStrain Inc Magnetic Mount DVRT vs Conventional Bonded Foil Strain Gauge Copyright 2008 MicroStrain Inc Magnetic Mount DVRT Strain Gauge vs Conventional Bonded Strain Gauge 4 trials, magnetic mount reapplied 4 trials, magnetic mount reapplied Slope: /-.01, R^2=.998 Slope: /-.01, R^2=.998 Offset: 14 trials repeat plucking, +/ microstrain Offset: 14 trials repeat plucking, +/ microstrain Copyright 2008 MicroStrain Inc Temperature Testing Copyright 2008 MicroStrain Inc Field testing on composite deck bridge in Shelburne, VT Copyright 2008 MicroStrain Inc Thank you Any Questions? Copyright 2009 MicroStrain Inc