4 April 1997 High-speed photographic system for objects with highly radiant backgrounds
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Abstract
We are currently developing a high-speed photographic system that images objects engulfed in high radiance backgrounds. Using a copper vapor laser as a pulsed illuminator in conjunction with a narrow band interference filter and an electro-optic shutter as spectral and temporal filters respectively, the background radiance is diminished by eight orders of magnitude. Consequently, the back-scattered imaging photons from the laser overpower the radiant background, resulting in a sufficiently high imaging-to- background ratio. Such high levels of background discrimination is made possible by the copper vapor laser that illuminates within a spectral line of 7 GHz with great intensity centered on the 1 nm vapor laser that illuminates within a spectral line of 7 GHz with great intensity centered on the 1 nm wide transmission band of the interference filter. The laser emits 30 ns pulses with a repetition rate of 20 kHz, synchronized with an equivalent open aperture period of the electro-optic shutter. The image is captured by an electronic camera at the rate of 20,000 per second. The image is available for further digital image processing.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kannan Krishnaswami, Kannan Krishnaswami, Michael M. Tilleman, Michael M. Tilleman, Samuel SeungWook Choi, Samuel SeungWook Choi, Sergei G. Krivoshlykov, Sergei G. Krivoshlykov, } "High-speed photographic system for objects with highly radiant backgrounds", Proc. SPIE 3018, Color Imaging: Device-Independent Color, Color Hard Copy, and Graphic Arts II, (4 April 1997); doi: 10.1117/12.271620; https://doi.org/10.1117/12.271620
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