Emission tomography of laser induced plasmas with large acceptance angle apertures

TL;DR

This paper introduces a method using large acceptance angle apertures combined with numerical processing to improve the efficiency of laser-induced plasma tomography, enabling faster data collection without sacrificing spatial resolution.

Contribution

It proposes a novel aperture design and numerical correction technique to reduce integration time in plasma emissivity measurements, enhancing laser plasma diagnostics.

Findings

Reduced integration time for plasma tomography.

Restored spatial resolution with numerical processing.

Applicable to early-stage plasma diagnostics.

Abstract

It is proposed to use apertures with large acceptance angles to reduce the integration time when studying the emissivity of laser induced plasmas by means of the Abel inversion method. The spatial resolution lost due to contributions of angled lines of sight to the intensity data collected along the plasma plume diameter is restored by a special numerical data processing. The procedure is meant for the laser induced plasma diagnostics and tomography when the integration time needed to achieve a reasonable signal to noise ratio exceeds a characteristic time scale of the plasma state variations which is short especially at early stages of the plasma evolution.