Remote, real-time, on-line monitoring of high-temperature samples by noninvasive open-path laser plasma spectrometry

Abstract

A remote detection system based on optical emission spectrometry of laser-induced plasmas has been developed to record spectra in the visible region from samples placed at remote distances from the excitation source. Unlike from fiber-optic-based systems, light collection is performed remotely as well. Laboratory-scale experiments have shown the possibility of performing real-time analysis of samples placed remotely. The application in the noninvasive analysis of hot samples (at 1,200 degrees C) has been demonstrated as well, allowing the dynamic monitoring of selective elemental migration.

Real-Time Monitoring of High-Temperature Corrosion in Stainless Steels by Open-Path Laser-Induced Plasma Spectrometry

“…Under these circumstances, a different approach based on the remote focusing and collection of the laser and plasma light by means of telescopic optics may be used. This instrumental variation, called open-path LIPS (OP-LIPS), 19,20 keeps intact the inherent advantages of LIPS in terms of easy sampling, no sample preparation, and real-time data acquisition.…”

A theoretical study of atmospheric propagation of laser and return light for stand-off laser induced breakdown spectroscopy purposes

“…It is necessary to comment on the practical implications that atmospheric transmittance has on stand-off LIBS measurements [21][22][23][24][25][26][27]. A LIBS measurement is a LIBS spectrum, represented by S(λ), that means the response of the spectrometer for each and every wavelength.…”

Damage Profile of HDPE Polymer using Laser-Induced Plasma

“…In this experiment, LIPS in-depth analyses of the elemental migration caused by the temperature were observed [12]. In recent experiments on an open-path system, LIPS performed measurements remotely, up to 10 meters away from the sample [13]. These experiments have considered the application of LIPS in the chemical mapping of different sample matrices over a range of depths to estimate the spatial distribution of their elemental compositions [14,15].…”

“…These advantages make LIPS particularly useful technique for surface analysis and chemical mapping of bulk solid samples [8,9]. Furthermore, LIPS depth profiles were verified in different matrices, such as thick Zn-coated steel, steels, brass, zinc, foils of iron, and semiconductors [8][9][10][11][12][13]. Because of the characteristic noninvasive nature of LIPS, samples of stainless steel located in a laboratory oven were monitored remotely at different temperatures via fiber optics.…”