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
Publicado: 2018
Materias:
Spectroscopy
Thermal lens
Water monitoring
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18501168_v29_n3_p90_Barreiro
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 paper:paper_18501168_v29_n3_p90_Barreiro
record_format dspace
spelling paper:paper_18501168_v29_n3_p90_Barreiro2023-06-08T16:29:25Z Thermal lens spectroscopy excited with two wavelengths 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. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18501168_v29_n3_p90_Barreiro 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
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.
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
publishDate 2018
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_18501168_v29_n3_p90_Barreiro
http://hdl.handle.net/20.500.12110/paper_18501168_v29_n3_p90_Barreiro
_version_ 1768542809945538560

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