LED-Based Photoacoustic NO2Sensor with a Sub-ppb Detection Limit
| Autor: | Markku Vainio, Erkki Ikonen, Juho Karhu, Tuomas Hieta, Farshid Manoocheri |
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| Přispěvatelé: | Metrology Research Institute, Gasera Ltd., University of Helsinki, Aalto-yliopisto, Aalto University, Department of Chemistry, Tampere University, Physics |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
QEPAS
Materials science 116 Chemical sciences Bioengineering 02 engineering and technology trace gas sensor NO2 high sensitivity 114 Physical sciences 01 natural sciences Signal law.invention NO 010309 optics Background noise Optics LEVEL DETECTION law 0103 physical sciences Instrumentation Photoacoustic spectroscopy NITROGEN-DIOXIDE Fluid Flow and Transfer Processes Detection limit photoacoustic spectroscopy business.industry Process Chemistry and Technology Detector 021001 nanoscience & nanotechnology Wavelength Dichroic filter light-emitting diode 0210 nano-technology business Light-emitting diode |
| Zdroj: | Karhu, J, Hieta, T, Manoocheri, F, Vainio, M & Ikonen, E 2021, ' LED-Based Photoacoustic NO 2 Sensor with a Sub-ppb Detection Limit ', ACS Sensors, vol. 6, no. 9, pp. 3303–3307 . https://doi.org/10.1021/acssensors.1c01073 |
| DOI: | 10.1021/acssensors.1c01073 |
| Popis: | Funding Information: The work was supported by the Academy of Finland (Project Numbers 326444 and 314364) and by the Academy of Finland’s Flagship Programme, Photonics Research and Innovation (PREIN), Decision Number: 320167. Publisher Copyright: © 2021 The Authors. Published by American Chemical Society. A high-sensitivity light-emitting diode (LED)-based photoacoustic NO2 sensor is demonstrated. Sensitive photoacoustic gas sensors based on incoherent light sources are typically limited by background noise and drifts due to a strong signal generated by light absorbed at the photoacoustic cell walls. Here, we reach a sub-ppb detection limit and excellent stability using cantilever-enhanced photoacoustic detection and perform a two-channel relative measurement. A white-light LED is used as a light source, and the spectrum is divided into two wavelength channels with a dichroic filter. The photoacoustic signals generated by the two wavelength channels are measured simultaneously and used to solve the NO2 concentration. The background signal is highly correlated between the two channels, and its variations are suppressed in the relative measurement. A noise level below 1 ppb is reached with an averaging time of 70 s. This is, to the best of our knowledge, the first time a sub-ppb detection limit is demonstrated with an LED-based photoacoustic NO2 sensor. As LEDs are available at a wide selection of emission wavelengths, the results show great potential for development of cost-effective and sensitive detectors for a variety of other trace gasses as well. |
| Databáze: | OpenAIRE |
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