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Sensors 2016, 16(5), 587; doi:10.3390/s16050587

Remote Evaluation of Rotational Velocity Using a Quadrant Photo-Detector and a DSC Algorithm

School of Optoelectronic Information, Chongqing University of Technology, Chongqing 400054, China
These authors contributed equally to this work.
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Academic Editor: Caterina Ciminelli
Received: 28 February 2016 / Revised: 16 April 2016 / Accepted: 20 April 2016 / Published: 25 April 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3219 KB, uploaded 25 April 2016]   |  

Abstract

This paper presents an approach to remotely evaluate the rotational velocity of a measured object by using a quadrant photo-detector and a differential subtraction correlation (DSC) algorithm. The rotational velocity of a rotating object is determined by two temporal-delay numbers at the minima of two DSCs that are derived from the four output signals of the quadrant photo-detector, and the sign of the calculated rotational velocity directly represents the rotational direction. The DSC algorithm does not require any multiplication operations. Experimental calculations were performed to confirm the proposed evaluation method. The calculated rotational velocity, including its amplitude and direction, showed good agreement with the given one, which had an amplitude error of ~0.3%, and had over 1100 times the efficiency of the traditional cross-correlation method in the case of data number N > 4800. The confirmations have shown that the remote evaluation of rotational velocity can be done without any circular division disk, and that it has much fewer error sources, making it simple, accurate and effective for remotely evaluating rotational velocity. View Full-Text
Keywords: remote evaluation; rotational velocity; differential subtraction correlation; quadrant photodetector; temporal-delay number remote evaluation; rotational velocity; differential subtraction correlation; quadrant photodetector; temporal-delay number
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. (CC BY 4.0).

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MDPI and ACS Style

Zeng, X.; Zhu, Z.; Chen, Y. Remote Evaluation of Rotational Velocity Using a Quadrant Photo-Detector and a DSC Algorithm. Sensors 2016, 16, 587.

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