Electronic Journal Technical Acoustics ISSN 1819-2408

M. Arronte, E. Ortega, L. Ponce, E. de Posada, E. Rodriguez, T. Flores

Real-time monitoring of de-thorning process in Opunctia Nopalea by using a PILA technique

language: English

received 02.10.2009, published 04.02.2010

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ABSTRACT

It is demonstrated that Photo-acoustic Induced by Laser Ablation (PILA) technique is suitable for the real time control and monitoring of the de-thorning process of nopal vegetable using pulsed laser. Two methods for detection of thorns are proposed; the first one uses the photo-acoustic amplitude and the second one is based in the harmonic composition of photo-acoustic signals. The latter detects clearly, thorns positions, differentiating them from other features that could exist in the nopal cortex. Harmonic composition of photo-acoustic signals also allows defining when thorns have been removed. Finally, it is obtained a characteristic pulse duration that, for the used energy range, maximizes thorns removal.
Keywords: pulsed photo-acoustic, laser cleaning, laser ablation, photo-acoustic monitoring, laser-matter interaction.

10 pages, 9 figures

Сitation: M. Arronte, E. Ortega, L. Ponce, E. de Posada, E. Rodriguez, T. Flores. Real-time monitoring of de-thorning process in Opunctia Nopalea by using a PILA technique. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2010, 1.

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		Arronte Miguel - Senior Researcher of Laser Technology Laboratory at CICATA-IPN, Altamira, Mexico, professor, Ph.D, Area of scientific interests is laser technology and applications. e-mail: arronte(at)yahoo.com
		Ortega Emmanuel - MSc Student at CICATA-IPN, Altamira, Mexico
		Ponce Luis - Senior Researcher of Laser Technology Laboratory at CICATA-IPN, Altamira, Mexico, professor, Ph.D, Area of scientific interests is laser technology and applications. e-mail: lponce(at)ipn.mx
		De Posada Eduardo - Senior Researcher of Laser Technology Laboratory at CICATA-IPN, Altamira, Mexico, professor, Ph.D, Area of scientific interests is laser technology and application
		Rodriguez Eugenio - Senior Researcher of Laser Technology Laboratory at CICATA-IPN, Altamira, Mexico, professor, Ph.D, Area of scientific interests is laser technology and applications
		Flores Teresa - Senior Researcher of Laser Technology Laboratory at CICATA-IPN, Altamira, Mexico, professor, Ph.D (chemical sciences), Area of scientific interests is laser technology and applications