Abstract
To estimate the acoustic plasma energy in laser-induced breakdown spectroscopy (LIBS) experiments, a light collecting and acoustic sensing device based on a coil of plastic optical fiber (POF) is proposed. The speckle perturbation induced by the plasma acoustic energy was monitored using a CCD camera placed at the end of a coil of multimode POF and processed with an intraimage contrast ratio method. The results were successfully verified with the acoustic energy measured by a reference microphone. The proposed device is useful for normalizing LIBS spectra, enabling a better estimation of the sample's chemical composition.
Highlights
Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopic technique that can detect and quantify analytes in solid, liquid, and gaseous samples
The capturing window was 40 μs, and the delay between the laser pulse and the spectrum capturing was fixed to 4 μs, a typical value that represents a compromise between the intensity of the atomic emission lines and that of the background
Its collecting efficiency is 6% of the classical solution of volume optics pointed at the plasma plume; in contrast, it is able to integrate the optical emission around the plasma and the alignment is less critical
Summary
Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopic technique that can detect and quantify analytes in solid, liquid, and gaseous samples It is based on a high power pulsed laser that ablates a small amount of material, creating a plasma. Plasma emission is usually collected by means of a large-core silica optical fiber coupled with a lens system pointed to the zone where the plasma plume is expected to be [17,18] This is an efficient system that captures a maximum amount of light from the plasma, but it is difficult to align and its efficiency suffers from fluctuations in the spatial position and shape of the plasma plume [19].
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