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Journal of Sensors
Volume 2018, Article ID 1037083, 9 pages
https://doi.org/10.1155/2018/1037083
Research Article

Measuring the Angular Velocity of a Propeller with Video Camera Using Electronic Rolling Shutter

School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China

Correspondence should be addressed to Tiejun Li; nc.ude.tubeh@nujeit_il

Received 7 October 2017; Accepted 12 February 2018; Published 21 March 2018

Academic Editor: Stephane Evoy

Copyright © 2018 Yipeng Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Noncontact measurement for rotational motion has advantages over the traditional method which measures rotational motion by means of installing some devices on the object, such as a rotary encoder. Cameras can be employed as remote monitoring or inspecting sensors to measure the angular velocity of a propeller because of their commonplace availability, simplicity, and potentially low cost. A defect of the measurement with cameras is to process the massive data generated by cameras. In order to reduce the collected data from the camera, a camera using ERS (electronic rolling shutter) is applied to measure angular velocities which are higher than the speed of the camera. The effect of rolling shutter can induce geometric distortion in the image, when the propeller rotates during capturing an image. In order to reveal the relationship between the angular velocity and the image distortion, a rotation model has been established. The proposed method was applied to measure the angular velocities of the two-blade propeller and the multiblade propeller. The experimental results showed that this method could detect the angular velocities which were higher than the camera speed, and the accuracy was acceptable.