Thermal lens spectroscopy excited with two wavelengths

There is a worldwide need for low cost devices with high sensitivity and selectivity for water monitoring and medical and biological analysis. Most commercial equipments suitable for this type of applications are of big dimensions and / or excessive costs. Other types of methods require sample pre-t...

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Detalles Bibliográficos
Autores principales:	Barreiro, N.L., Méndez, J.R., Slezak, V.B.
Formato:	JOUR
Materias:	Spectroscopy Thermal lens Water monitoring
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_18501168_v29_n3_p90_Barreiro
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_18501168_v29_n3_p90_Barreiro
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spelling	todo:paper_18501168_v29_n3_p90_Barreiro2023-10-03T16:33:15Z Thermal lens spectroscopy excited with two wavelengths Barreiro, N.L. Méndez, J.R. Slezak, V.B. Spectroscopy Thermal lens Water monitoring There is a worldwide need for low cost devices with high sensitivity and selectivity for water monitoring and medical and biological analysis. Most commercial equipments suitable for this type of applications are of big dimensions and / or excessive costs. Other types of methods require sample pre-treatments or pre-concentrations making them time consuming. In this work we show the design of a compact low cost thermal lens system for water monitoring. The device is made up of two compact excitation lasers (pointers) of different wavelengths, 405 nm and 532 nm, modulated at low frequencies (4 and 7 Hz respectively), allowing differential measurements in real time. It also includes a red laser diode as probe which goes through the sample collinearly with the excitation beams. A small sample of the probe beam impinges on a 200μm core optic fiber and is guided to a photodiode. The detector signal is digitized by an Arduino microcontroller and sent to a PC to be analyzed. The signal processing is made in real time applying a Fast Fourier Transform to distinguish the signals that come from both excitation sources. A flow injection analysis system was implemented in order to speed up measurements. In this work we show how this system works using low toxicity dyes. © 2018, Centro de Investigaciones en Laseres y Aplicaciones. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_18501168_v29_n3_p90_Barreiro
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Spectroscopy Thermal lens Water monitoring
spellingShingle	Spectroscopy Thermal lens Water monitoring Barreiro, N.L. Méndez, J.R. Slezak, V.B. Thermal lens spectroscopy excited with two wavelengths
topic_facet	Spectroscopy Thermal lens Water monitoring
description	There is a worldwide need for low cost devices with high sensitivity and selectivity for water monitoring and medical and biological analysis. Most commercial equipments suitable for this type of applications are of big dimensions and / or excessive costs. Other types of methods require sample pre-treatments or pre-concentrations making them time consuming. In this work we show the design of a compact low cost thermal lens system for water monitoring. The device is made up of two compact excitation lasers (pointers) of different wavelengths, 405 nm and 532 nm, modulated at low frequencies (4 and 7 Hz respectively), allowing differential measurements in real time. It also includes a red laser diode as probe which goes through the sample collinearly with the excitation beams. A small sample of the probe beam impinges on a 200μm core optic fiber and is guided to a photodiode. The detector signal is digitized by an Arduino microcontroller and sent to a PC to be analyzed. The signal processing is made in real time applying a Fast Fourier Transform to distinguish the signals that come from both excitation sources. A flow injection analysis system was implemented in order to speed up measurements. In this work we show how this system works using low toxicity dyes. © 2018, Centro de Investigaciones en Laseres y Aplicaciones. All rights reserved.
format	JOUR
author	Barreiro, N.L. Méndez, J.R. Slezak, V.B.
author_facet	Barreiro, N.L. Méndez, J.R. Slezak, V.B.
author_sort	Barreiro, N.L.
title	Thermal lens spectroscopy excited with two wavelengths
title_short	Thermal lens spectroscopy excited with two wavelengths
title_full	Thermal lens spectroscopy excited with two wavelengths
title_fullStr	Thermal lens spectroscopy excited with two wavelengths
title_full_unstemmed	Thermal lens spectroscopy excited with two wavelengths
title_sort	thermal lens spectroscopy excited with two wavelengths
url	http://hdl.handle.net/20.500.12110/paper_18501168_v29_n3_p90_Barreiro
work_keys_str_mv	AT barreironl thermallensspectroscopyexcitedwithtwowavelengths AT mendezjr thermallensspectroscopyexcitedwithtwowavelengths AT slezakvb thermallensspectroscopyexcitedwithtwowavelengths
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Thermal lens spectroscopy excited with two wavelengths

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