Intensity Modulated Photothermal Measurements of NO<sub>2</sub> with a Compact Fiber-Coupled Fabry–Pérot Interferometer

Sensors for the reliable measurement of nitrogen dioxide concentrations are of high interest due the adverse health effects of this pollutant. This work employs photothermal spectroscopy to measure nitrogen dioxide concentrations at the parts per billion level. Absorption induced temperature changes...

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Main Authors:	Philipp Breitegger, Benjamin Lang, Alexander Bergmann
Format:	Article
Language:	English
Published:	MDPI AG 2019-07-01
Series:	Sensors
Subjects:	nitrogen dioxide photothermal interferometry gas sensor optical microphone
Online Access:	https://www.mdpi.com/1424-8220/19/15/3341

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spelling	doaj-0b8adbf749bc4ea7a72a66ab57223af02020-11-24T21:34:29ZengMDPI AGSensors1424-82202019-07-011915334110.3390/s19153341s19153341Intensity Modulated Photothermal Measurements of NO<sub>2</sub> with a Compact Fiber-Coupled Fabry–Pérot InterferometerPhilipp Breitegger0Benjamin Lang1Alexander Bergmann2Institute of Electronic Sensor Systems, Graz University of Technology, Graz 8010, AustriaInstitute of Electronic Sensor Systems, Graz University of Technology, Graz 8010, AustriaInstitute of Electronic Sensor Systems, Graz University of Technology, Graz 8010, AustriaSensors for the reliable measurement of nitrogen dioxide concentrations are of high interest due the adverse health effects of this pollutant. This work employs photothermal spectroscopy to measure nitrogen dioxide concentrations at the parts per billion level. Absorption induced temperature changes are detected by means of a fiber-coupled Fabry−Pérot interferometer. The small size of the interferometer enables small detection volumes, paving the way for miniaturized sensing concepts as well as fast response times, demonstrated down to 3 s. A normalized noise equivalent absorption of <inline-formula> <math display="inline"> <semantics> <mrow> <mn>7.5</mn> <mo>×</mo> <msup> <mn>10</mn> <mrow> <mo>−</mo> <mn>8</mn> </mrow> </msup> </mrow> </semantics> </math> </inline-formula> cm<sup>−1</sup>W/<inline-formula> <math display="inline"> <semantics> <msqrt> <mi>Hz</mi> </msqrt> </semantics> </math> </inline-formula> is achieved. Additionally, due to the rigid structure of the interferometer, the sensitivity to mechanical vibrations is shown to be minor.https://www.mdpi.com/1424-8220/19/15/3341nitrogen dioxidephotothermal interferometrygas sensoroptical microphone
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Philipp Breitegger Benjamin Lang Alexander Bergmann
spellingShingle	Philipp Breitegger Benjamin Lang Alexander Bergmann Intensity Modulated Photothermal Measurements of NO<sub>2</sub> with a Compact Fiber-Coupled Fabry–Pérot Interferometer Sensors nitrogen dioxide photothermal interferometry gas sensor optical microphone
author_facet	Philipp Breitegger Benjamin Lang Alexander Bergmann
author_sort	Philipp Breitegger
title	Intensity Modulated Photothermal Measurements of NO<sub>2</sub> with a Compact Fiber-Coupled Fabry–Pérot Interferometer
title_short	Intensity Modulated Photothermal Measurements of NO<sub>2</sub> with a Compact Fiber-Coupled Fabry–Pérot Interferometer
title_full	Intensity Modulated Photothermal Measurements of NO<sub>2</sub> with a Compact Fiber-Coupled Fabry–Pérot Interferometer
title_fullStr	Intensity Modulated Photothermal Measurements of NO<sub>2</sub> with a Compact Fiber-Coupled Fabry–Pérot Interferometer
title_full_unstemmed	Intensity Modulated Photothermal Measurements of NO<sub>2</sub> with a Compact Fiber-Coupled Fabry–Pérot Interferometer
title_sort	intensity modulated photothermal measurements of no<sub>2</sub> with a compact fiber-coupled fabry–pérot interferometer
publisher	MDPI AG
series	Sensors
issn	1424-8220
publishDate	2019-07-01
description	Sensors for the reliable measurement of nitrogen dioxide concentrations are of high interest due the adverse health effects of this pollutant. This work employs photothermal spectroscopy to measure nitrogen dioxide concentrations at the parts per billion level. Absorption induced temperature changes are detected by means of a fiber-coupled Fabry−Pérot interferometer. The small size of the interferometer enables small detection volumes, paving the way for miniaturized sensing concepts as well as fast response times, demonstrated down to 3 s. A normalized noise equivalent absorption of <inline-formula> <math display="inline"> <semantics> <mrow> <mn>7.5</mn> <mo>×</mo> <msup> <mn>10</mn> <mrow> <mo>−</mo> <mn>8</mn> </mrow> </msup> </mrow> </semantics> </math> </inline-formula> cm<sup>−1</sup>W/<inline-formula> <math display="inline"> <semantics> <msqrt> <mi>Hz</mi> </msqrt> </semantics> </math> </inline-formula> is achieved. Additionally, due to the rigid structure of the interferometer, the sensitivity to mechanical vibrations is shown to be minor.
topic	nitrogen dioxide photothermal interferometry gas sensor optical microphone
url	https://www.mdpi.com/1424-8220/19/15/3341
work_keys_str_mv	AT philippbreitegger intensitymodulatedphotothermalmeasurementsofnosub2subwithacompactfibercoupledfabryperotinterferometer AT benjaminlang intensitymodulatedphotothermalmeasurementsofnosub2subwithacompactfibercoupledfabryperotinterferometer AT alexanderbergmann intensitymodulatedphotothermalmeasurementsofnosub2subwithacompactfibercoupledfabryperotinterferometer
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Intensity Modulated Photothermal Measurements of NO<sub>2</sub> with a Compact Fiber-Coupled Fabry–Pérot Interferometer

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