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1 September 2006 A novel multichannel nonintensified ultra-high-speed camera using multiwavelength illumination
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Multi-channel gated-intensified cameras are commonly used for capturing images at ultra-high frame rates. However, the image intensifier reduces the image resolution to such an extent that the images are often unsuitable for applications requiring high quality images, such as digital image correlation. We report on the development of a new type of non-intensified multi-channel camera system that permits recording of image sequences at ultra-high frame rates at the native resolution afforded by the imaging optics and the cameras used. This camera system is based upon the use of short duration light pulses of different wavelengths for illumination of the target and the use of wavelength selective elements in the imaging system to route each particular wavelength of light to a particular camera. A prototype of this camera system comprising four dual-frame cameras synchronized with four dual-cavity lasers producing laser pulses of four different wavelengths is described. The camera is built around a stereo microscope such that it can capture image sequences usable for 2D or 3D digital image correlation. The camera described herein is capable of capturing images at frame rates exceeding 100 MHz. The camera was used for capturing microscopic images of the chip-workpiece interface area during high speed machining. Digital image correlation was performed on the obtained images to map the shear strain rate in the primary-shear-zone during high speed machining.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ala Hijazi and Vis Madhavan "A novel multichannel nonintensified ultra-high-speed camera using multiwavelength illumination", Proc. SPIE 6302, Imaging Spectrometry XI, 630209 (1 September 2006);

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