Ultrafast camera for motion recognition by tomographic techniques

Luca Poletto; Alessandro Dalla Lana; Ruggero Frezza; Nicola Moretto; Giampiero Naletto; Giuseppe Tondello

doi:10.1117/12.520811

6 February 2004 Ultrafast camera for motion recognition by tomographic techniques

Luca Poletto, Alessandro Dalla Lana, Ruggero Frezza, Nicola Moretto, Giampiero Naletto, Giuseppe Tondello

Proceedings Volume 5210, Ultrahigh- and High-Speed Photography, Photonics, and Videography; (2004) https://doi.org/10.1117/12.520811
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

A camera for ultra-fast motion measurement based on tomographic techniques is presented. The motion analysis is performed by following the movements of several discrete points (light emitting sources) positioned on the object. The camera utilizes three linear detectors, and the optical system is designed so that the measurements on the linear detectors are projections of the two-dimensional image. Using a suitable reconstructing algorithm based on discrete tomographic techniques, the position of the original point sources on the virtual two-dimensional image is determined. The remaining ambiguity of the tomographic reconstruction is minimized by assuming a model for the intensity of the point sources and adopting a normalization algorithm. The realization of this principle requires a rather sophisticated optical system to realize the one-dimension projection of the whole field of view without introducing significant aberrations, and three such optical systems in parallel are necessary to realize the tomographic reconstruction. In addition, these optical systems have to guarantee some depth of focus to allow reconstruction of movements also along the line of sight. Here we present the design of a camera based on this principle that can be operated at frame rates up to 40 KHz; it has a 30° field-of-view diameter and focuses objects at 2 m distance with spatial resolution of about 1.5 mm over a 1.1 m depth of focus length.

Citation Download Citation

Luca Poletto, Alessandro Dalla Lana, Ruggero Frezza, Nicola Moretto, Giampiero Naletto, and Giuseppe Tondello "Ultrafast camera for motion recognition by tomographic techniques", Proc. SPIE 5210, Ultrahigh- and High-Speed Photography, Photonics, and Videography, (6 February 2004); https://doi.org/10.1117/12.520811

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KEYWORDS

Sensors

Cameras

Reconstruction algorithms

Tomography

Optical design

Ultrafast phenomena

Cylindrical lenses

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