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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 31 — Nov. 1, 2013
  • pp: 7530–7539

Real-time visual sensing system achieving high-speed 3D particle tracking with nanometer resolution

Peng Cheng, Sissy M. Jhiang, and Chia-Hsiang Menq  »View Author Affiliations


Applied Optics, Vol. 52, Issue 31, pp. 7530-7539 (2013)
http://dx.doi.org/10.1364/AO.52.007530


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Abstract

This paper presents a real-time visual sensing system, which is created to achieve high-speed three-dimensional (3D) motion tracking of microscopic spherical particles in aqueous solutions with nanometer resolution. The system comprises a complementary metal–oxide-semiconductor (CMOS) camera, a field programmable gate array (FPGA), and real-time image processing programs. The CMOS camera has high photosensitivity and superior SNR. It acquires images of 128×120 pixels at a frame rate of up to 10,000 frames per second (fps) under the white light illumination from a standard 100 W halogen lamp. The real-time image stream is downloaded from the camera directly to the FPGA, wherein a 3D particle-tracking algorithm is implemented to calculate the 3D positions of the target particle in real time. Two important objectives, i.e., real-time estimation of the 3D position matches the maximum frame rate of the camera and the timing of the output data stream of the system is precisely controlled, are achieved. Two sets of experiments were conducted to demonstrate the performance of the system. First, the visual sensing system was used to track the motion of a 2 μm polystyrene bead, whose motion was controlled by a three-axis piezo motion stage. The ability to track long-range motion with nanometer resolution in all three axes is demonstrated. Second, it was used to measure the Brownian motion of the 2 μm polystyrene bead, which was stabilized in aqueous solution by a laser trapping system.

© 2013 Optical Society of America

OCIS Codes
(100.2000) Image processing : Digital image processing
(150.6910) Machine vision : Three-dimensional sensing
(330.4150) Vision, color, and visual optics : Motion detection

ToC Category:
Image Processing

History
Original Manuscript: August 2, 2013
Revised Manuscript: October 4, 2013
Manuscript Accepted: October 4, 2013
Published: October 28, 2013

Virtual Issues
Vol. 9, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Peng Cheng, Sissy M. Jhiang, and Chia-Hsiang Menq, "Real-time visual sensing system achieving high-speed 3D particle tracking with nanometer resolution," Appl. Opt. 52, 7530-7539 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-31-7530

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