Absorption tomography of laser induced plasmas with a large aperture

TL;DR

This paper introduces a novel absorption tomography technique for laser-induced plasmas in LIBS, enabling shorter signal integration times and cost-effective detection by using a large aperture and advanced data processing.

Contribution

It proposes a new method combining large aperture measurements with numerical processing to improve plasma tomography efficiency and reduce costs.

Findings

Allows shorter integration times for plasma analysis.

Enables use of inexpensive linear detectors instead of costly 2D detectors.

Achieves high spatial resolution through numerical data processing.

Abstract

An emission tomography of laser-induced plasmas employed in the laser induced breakdown spectroscopy (LIBS) requires long signal integration times during which the plasma cannot be considered stationary. To reduce the integration time, it is proposed to measure a plasma absorption in parallel rays with an aperture that collects light coming from large fractions of the plasma plume at each aperture position. The needed spatial resolution is achieved by a special numerical data processing. Another advantage of the proposed procedure is that inexpensive linear CCD or non-discrete (PMT, photodiode) detectors can be used instead of costly 2-dimensional detectors.