Regularities of Formation, Taking Into Account the Sizes of the Object, of Spatial-Energy Profile of the Signal Recorded by Active-Pulse Vision Systems

Abstract

Regularities of formation of the spatial-energy profile (SEP) of the visibility zone (VZ) of active-pulse vision systems (APVS) have been numerically studied, taking into account the ratio of the cross sections of the observation object A_ob and the laser illumination beam A_las in the plane of the object location. For this, the concepts of the boundary distance S_bd, at which A_ob = A_las and the multiplier w = A_ob/A_las, which is added to the well-known equation for the recorded APVS signal, are introduced. Taking into account the finite length of the VZ, the following cases can be distinguished. If S_bd ≥ S_end (end point of the VZ) within the VZ w =1. Previously known studies were performed for this case. When S_start (starting point of the VZ) ≤ S_bd < S_end within the VZ, there may first be a range of distances with a maximum value w₁ = 1, after which there is a range with a factor decreasing to a certain minimum value w₂ < 1. Finally, when S_bd < S_start within the limits of the VZ, w₁(S_del1) < 1 and w₂(S_del2) < 1 (in this case, w₂ is always less than w₁, and the delay distance S_del1 < S_del2). Taking into account the multiplier w < 1 leads, in the corresponding range, to a change in the shape of the SEP, maximum signal values, and other characteristics implemented within the visibility zone. A generalizing parameter that in practice characterizes the infl uence of the range of distances, where w < 1, is the maximum operating range (MOR) of the system S_MOR. For the parameters used in the calculations, taking into account the indicated influence led to a decrease in the S_MOR by 2.9–5.0 times. The main mechanisms for the influence of the relative position of S_bd and the VZ on the characteristics of MOR are given. The main results of numerical modeling are confirmed experimentally.