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<p>For the second observation method, when a certain value of the delay distance <i>S</i><sub><i>del</i></sub> is set on the control panel, a model for the formation of the spatial-energy profile (SEP) of the visibility zone was proposed for the case often realized in practice when the duration of the laser illumination pulses of objects Δ<i>t</i><sub><i>las</i></sub> is significantly shorter than the duration of the strobe pulses (exposure time) of the photodetector (PD) Δ<i>t</i><sub><i>PD</i></sub>. Analytical expressions that relate the characteristic distances (points) of the visibility zone SEP to the durations of the laser illumination pulses, photodetector strobing, and internal (technical) delay and the time points corresponding to the end of the strobe-pulse front and the beginning of its decay for their trapezoidal or triangular shape were obtained based on the proposed model. Numerical calculations confirmed the validity of the obtained analytical expressions. The possibility of controlling the shapes and durations of the front and decay of the SEP by changing the corresponding strobe-pulse parameters was demonstrated. On the other hand, it was possible to determine, e.g., the front and tail times of strobe pulses with a trapezoidal or triangular shape based on the experimentally recorded SEP. It was shown that for Δ<i>t</i><sub><i>las</i></sub> ≪ Δ<i>t</i><sub><i>PD</i></sub>, the small distance effect (SDE) that was previously discovered for systems with comparable values of Δ<i>t</i><sub><i>las</i></sub> and Δ<i>t</i><sub><i>PD</i></sub> also manifested itself. The manifestation of an SDE for rectangular shape strobe pulses was experimentally demonstrated.</p>

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Regularities of Formation of the Visibility Zone by Active-Pulse Vision Systems with a Comparatively Short Duration of Backlight Pulses

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • B. F. Kuntsevich,
  • I. N. Puchkouski,
  • S. S. Shavel,
  • S. B. Bushuk

摘要

For the second observation method, when a certain value of the delay distance Sdel is set on the control panel, a model for the formation of the spatial-energy profile (SEP) of the visibility zone was proposed for the case often realized in practice when the duration of the laser illumination pulses of objects Δtlas is significantly shorter than the duration of the strobe pulses (exposure time) of the photodetector (PD) ΔtPD. Analytical expressions that relate the characteristic distances (points) of the visibility zone SEP to the durations of the laser illumination pulses, photodetector strobing, and internal (technical) delay and the time points corresponding to the end of the strobe-pulse front and the beginning of its decay for their trapezoidal or triangular shape were obtained based on the proposed model. Numerical calculations confirmed the validity of the obtained analytical expressions. The possibility of controlling the shapes and durations of the front and decay of the SEP by changing the corresponding strobe-pulse parameters was demonstrated. On the other hand, it was possible to determine, e.g., the front and tail times of strobe pulses with a trapezoidal or triangular shape based on the experimentally recorded SEP. It was shown that for Δtlas ≪ ΔtPD, the small distance effect (SDE) that was previously discovered for systems with comparable values of Δtlas and ΔtPD also manifested itself. The manifestation of an SDE for rectangular shape strobe pulses was experimentally demonstrated.