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Sensors 2012, 12(12), 16771-16784; https://doi.org/10.3390/s121216771

High Dynamics and Precision Optical Measurement Using a Position Sensitive Detector (PSD) in Reflection-Mode: Application to 2D Object Tracking over a Smart Surface

1
FIE&FIMMR, University Valahia of Targoviste, B-dul Unirii Nr.18-20, 130082 Targoviste, Romania
2
FEMTO-ST Institute, UMR CNRS-6174, UFC, ENSMM, UTBM, Dpt. AS2M, 24 Rue Alain Savary, 25000 Besancon, France
*
Author to whom correspondence should be addressed.
Received: 18 October 2012 / Revised: 30 November 2012 / Accepted: 30 November 2012 / Published: 6 December 2012
(This article belongs to the Section Physical Sensors)
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Abstract

When related to a single and good contrast object or a laser spot, position sensing, or sensitive, detectors (PSDs) have a series of advantages over the classical camera sensors, including a good positioning accuracy for a fast response time and very simple signal conditioning circuits. To test the performance of this kind of sensor for microrobotics, we have made a comparative analysis between a precise but slow video camera and a custom-made fast PSD system applied to the tracking of a diffuse-reflectivity object transported by a pneumatic microconveyor called Smart-Surface. Until now, the fast system dynamics prevented the full control of the smart surface by visual servoing, unless using a very expensive high frame rate camera. We have built and tested a custom and low cost PSD-based embedded circuit, optically connected with a camera to a single objective by means of a beam splitter. A stroboscopic light source enhanced the resolution. The obtained results showed a good linearity and a fast (over 500 frames per second) response time which will enable future closed-loop control by using PSD. View Full-Text
Keywords: microrobotics; optics; optomechatronics; sensing; PSD; position sensitive detector; smart-surface; tracking algorithm microrobotics; optics; optomechatronics; sensing; PSD; position sensitive detector; smart-surface; tracking algorithm
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Ivan, I.A.; Ardeleanu, M.; Laurent, G.J. High Dynamics and Precision Optical Measurement Using a Position Sensitive Detector (PSD) in Reflection-Mode: Application to 2D Object Tracking over a Smart Surface. Sensors 2012, 12, 16771-16784.

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