Time-Resolved Solid-State Array Imaging Systems: Developments and Applications.

摘要

Several optical, single transient data imaging systems have been developed at the Lawrence Livermore National Laboratory for providing time-, space-, and intensity information of pulsed radiation sources. The basic components of these systems are fast-gated cameras, large-bandwidth transmission lines, large memories, and image processors. Several methods are currently investigated to (1) produce faster optical gates without significant irising or reduction in resolution, and (2) to improve spatial resolution. Both photodiode arrays and charge-coupled devices (CCD) are used for the imagers in the solid-state cameras. These cameras are designed to achieve a large dynamic range (500:1), low saturation fluence (less than or equal to 1.5 erg/cm sup 2 at 420 nm), and small frame time (less than or equal to 2.5 msec). Current investigations are concentrating on large segmented (512 x 512) photodiode arrays with CCD readout. All cameras are designed for fiber-optic or lens coupling. Maximum dynamic range and maximum signal-to-noise is achieved by using 8-, 10-, or 12-bit A/D converters. A technique known as data compression is applied to take advantage of a 10-bit system using an 8-bit data acquisition arrangement. The advent of large array cameras requires modifications in calibration procedure, data acquisition, and image processing. 3 refs., 5 figs., 2 tabs. (ERA citation 13:054476)