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.
© 2012 Optical Society of America
Fiber Optics and Optical Communications
Original Manuscript: June 27, 2012
Revised Manuscript: October 25, 2012
Manuscript Accepted: November 8, 2012
Published: November 30, 2012
Francisco Anabitarte, Luis Rodríguez-Cobo, José-Miguel López-Higuera, and Adolfo Cobo, "Normalization of laser-induced breakdown spectroscopy spectra using a plastic optical fiber light collector and acoustic sensor device," Appl. Opt. 51, 8306-8314 (2012)