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Digital Twin of a Photoacoustic Trace Gas Sensor for Monitoring Methane in Complex Gas Compositions

  • The digitalization of industrial processes requires smart sensor systems. Photoacoustic spectroscopy is well suited for this purpose as it allows for small-sized and low-cost trace gas analysis. However, the method is susceptible to changes in measurement conditions and standard calibration routines often fail to correct for all changes. We therefore created a Digital Twin (DT) of a photoacoustic trace gas sensor for methane and evaluated it regarding variations in gas composition (CH4, N2, O2, CO2, H2O), temperature and pressure. With a mean absolute percentage error of 0.8 % the accuracy of the sensor after DT compensation significantly exceeds the 24 % achieved based on standard calibration in nitrogen. For the first time, we can fully analytically compute the photoacoustic signal under moderate ambient conditions with an error in the ppbV range by taking a holistic approach. Assuming knowledge of the underlying energy transfer processes, the model of this Digital Twin can be adapted to any microphone based photoacoustic sensor for monitoring any analyte species.

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Metadaten
Author:Thomas RückORCiD, Max MüllerORCiD, Simon JobstORCiD, Stefan Weigl, Jonas Pangerl, Rudolf Bierl, Frank-Michael Matysik
DOI:https://doi.org/10.1016/j.snb.2022.133119
Parent Title (German):Sensors and Actuators B: Chemical
Document Type:Article
Language:English
Year of first Publication:2023
Release Date:2023/04/05
Tag:Acoustic resonance monitoring; Calibration-free method; CoNRad; Photoacoustic spectroscopy; Smart sensor
Digital Twin
Issue:378
Article Number:133119
Note:
Preprint unter: https://doi.org/10.2139/ssrn.4215170 ; https://opus4.kobv.de/opus4-oth-regensburg/frontdoor/index/index/docId/5417
Institutes:Fakultät Angewandte Natur- und Kulturwissenschaften
Begutachtungsstatus:peer-reviewed
research focus:Sensorik
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG