Study on the short pulselength direct-detect laser reflective tomography imaging ladar

Abstract

Range-resolved reflective tomography using short pulselength lasers has been shown to be an image reconstruction method which can be used to recover image information about an object with a non-imaging laser radar (ladar) system.The resulting time-dependent return signal (Project) is collected by a non-imaging optical system, which provides a onedimensional signal as a function of range. This paper presents a short pulselength direct-detect laser reflective tomography imaging ladar, and gives the image reconstruction results. In order to efficiently improve and modify the algorithms developed for reflective tomography, we develop a new imaging reconstruction algorithm.

Filters effects for different objects surfaces in reflective tomography laser radar

“…In reflective tomography, there is a "darkening" effect near the surface interior-reconstructed values are decreasing and becoming negative toward the interior boundary of the surfaces [13]. Theses effects can be demonstrated by the image reconstruction in reference [14]. We just give a brief presentation of the imaging results here.…”

“…Firstly, a brief of filtered back-projection [8,9], a standard method of tomography, is provided for reflective variable, c % is the filter function, which is the product of a window function and the magnitude of the spatial frequency [2,10,12,14] |…”

Short pulselength direct-detect laser reflective tomography imaging ladar: field results

“…In previous paper [10], a short pulselength direct-detect laser reflective tomography image of triangular prism is acquired by using a 1μm laser reflective tomography imaging system. Using the reflected broadened pulses at different projection angles, the image or the object can be accurately reconstructed by filtered back projection algorithm.…”