The Fanbeam Spectral Imager (FSI) system is under development as a tool for mine countermeasures, however, the system has potential for a variety of additional underwater remote sensing needs. Characteristics common to each intended application include high area coverage rate acquisition and 3D spatial by spectral data. The FSI system has been designed around a modular approach which utilizes separated illumination and detection modules to achieve a wide combined field-of-regard, while also providing reduction in common volume backscatter. The modularity and desired sensitivity have driven the optical and system design. This paper will detail the modular elements of the FSI design.
KEYWORDS: Cameras, 3D image processing, Imaging systems, 3D displays, 3D acquisition, Space operations, Chemical elements, CCD cameras, Video, High speed imaging
A high-speed 3D imaging system has been developed using multiple independent CCD cameras with sequentially triggered acquisition and individual field storage capability. The system described here utilizes sixteen independent cameras. A stereo alignment and triggering scheme arranges the cameras into two angularly separated banks of eight cameras each. By simultaneously triggering correlated stereo pairs, an eight-frame sequence of stereo images is captured. The delays can be individually adjusted to yield a greater number of acquired frames during more rapid segments of the vent, and the individual integration periods may be adjusted to ensure adequate radiometric response while minimizing image blur. Representation of the data as a 3D sequence introduces the issue of independent camera coordinate registration with the real scene. A discussion of the forward and inverse transform operator for the digital data is provided along with a description of the acquisition system.
Often the need arises for calibration of infrared systems in the environment of intended use, or field environment. The development of a field calibration platform for performance testing of infrared (IR) imaging and spectral analysis instrumentation is discussed. The calibration hardware is required to provide precise and traceable standards over a range of tests including minimum resolvable temperature difference (MRTD), noise equivalent temperature difference (NETD), minimum detectable temperature difference (MDTD), and modulation transfer function (MTF) for imaging systems, and known spectral content output for Fourier transform infrared radiometers (FTIR) and other spectral analysis instruments. The equipment package must consist of non-development components, and be portable, reliable, and repeatable under field conditions.
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