RELlABlLlTY AND VALIDATION OF AN INERTIAL SENSOR USED TO MEASURE ORIENTATION ANGLE

  • Benjamin Kane Williams
  • Joong Hyun Ryu
  • Pitre Collier Bourdon
  • Philip Graham-Smith
  • Peter J. Sinclair
Keywords: validity, error, IMU, accelerometer, accuracy

Abstract

This study examined the reliability and validity of an inertial measurement unit (IMU) for measuring orientation angle. An IMU was mounted onto a goniometer and moved through 0-90' with data collected at 10' increments. The process was repeated 10 times for all 3 axes. Reliability was measured via a typical error (TE) analysis from the 10 repeated trials. Validity was determined via a Pearson correlation and an ordinary least products (OLP) regression. The lMU was very reliable for all 3 axes (TE: x=0.03", y=0.03", z=0.02").T he Pearson correlation between the IMU and goniometer was large and significant for all 3 axes (r = 1.00,95%CI = 1 .O-1.0). The OLP regression showed no proportional bias for the 3 axes and only small fixed blas for the x and z axes. Overall the IMU tested was very reliably and accurate at measuring orientation angle.
Published
2016-11-06
Section
Equipment / Instrumentation