Shop : Details
Shop
Details
Dezember 2024
eBook (PDF)
Christian Weber
Miniaturized Photoacoustic Sensors for the Detection of Trace Gases in Ambient Air
Measuring the concentration of trace gases in ambient air is becoming increasingly important in a wide range of applications. However, current sensor solutions are often too large and complex to be suitable for large-scale use. This work emphasizes how the use of photoacoustic sensing can be used to overcome these drawbacks, and illustrates this with two sensors for different atmospheric trace gases.
Subject of the first part is the design of a miniaturized sensor for ambient CO2. A special focus is set on the dimensioning, the construction and the properties of the photoacoustic detector. For the evaluation of the detectors, a setup for a Fourier-transformation spectrometer is proposed which allows to determine the spectrally resolved detectance. The knowledge of the spectral detectance enables comprehensive statements on the gas filling, other gases, photoacoustic conditions and more. With the manufactured detectros and two different infrared LEDs, two fully integrated miniaturized sensors were designed. With dimensions of 7.5 mm × 8 mm × 17mm they are among the smallest optical gas sensors published so far.
The second part of this work is dedicated to a resonant photoacoustic one-chamber sensor, which contains a 450nm LED light source and a T-shaped resonator cell. Beside investigations on the resonance modes of the cell and the optical design, a novel approach for finding the resonance frequency with a photoacoustic wall-signal is proposed. Finally, both sensors were characterized with respect to their gas sensing properties such as sensitivity, linearity, resolution and cross sensitivities. Based on the results, their suitability for the application is evaluated.
Subject of the first part is the design of a miniaturized sensor for ambient CO2. A special focus is set on the dimensioning, the construction and the properties of the photoacoustic detector. For the evaluation of the detectors, a setup for a Fourier-transformation spectrometer is proposed which allows to determine the spectrally resolved detectance. The knowledge of the spectral detectance enables comprehensive statements on the gas filling, other gases, photoacoustic conditions and more. With the manufactured detectros and two different infrared LEDs, two fully integrated miniaturized sensors were designed. With dimensions of 7.5 mm × 8 mm × 17mm they are among the smallest optical gas sensors published so far.
The second part of this work is dedicated to a resonant photoacoustic one-chamber sensor, which contains a 450nm LED light source and a T-shaped resonator cell. Beside investigations on the resonance modes of the cell and the optical design, a novel approach for finding the resonance frequency with a photoacoustic wall-signal is proposed. Finally, both sensors were characterized with respect to their gas sensing properties such as sensitivity, linearity, resolution and cross sensitivities. Based on the results, their suitability for the application is evaluated.
Schlagwörter: Photoakustik; CO2; NO2; resonant; Spurengas; Photoacoustic; ambient trace gas
Weitere Formate
Print-Version: 978-3-8440-9724-5
DOI 10.2370/9783844098242
Sie benötigen den Adobe Reader, um diese Dateien ansehen zu können. Hier erhalten Sie eine kleine Hilfe und Informationen, zum Download der PDF-Dateien.
Bitte beachten Sie, dass die Online-Dokumente nicht ausdruckbar und nicht editierbar sind.
Bitte beachten Sie auch weitere Informationen unter: Hilfe und Informationen.
Bitte beachten Sie auch weitere Informationen unter: Hilfe und Informationen.
| Dokument |  | Gesamtdokument | ||
| Dateiart |  | |||
| Kosten |  | 44,85 € | ||
| Aktion |  | Zahlungspflichtig kaufen und download der Datei | ||
| Dokument |  | Inhaltsverzeichnis | ||
| Dateiart | | |||
| Kosten |  | frei | ||
| Aktion |  | Download der Datei | ||
Benutzereinstellungen für registrierte Online-Kunden (Online-Dokumente)
Sie können hier Ihre Adressdaten ändern sowie bereits georderte Dokumente erneut aufrufen.
Benutzer
Nicht angemeldet
Shaker Verlag GmbH
Am Langen Graben 15a
52353 Düren
Am Langen Graben 15a
52353 Düren
Mo. - Do. 8:00 Uhr bis 16:00 Uhr
Fr. 8:00 Uhr bis 15:00 Uhr
Fr. 8:00 Uhr bis 15:00 Uhr
Kontaktieren Sie uns. Wir helfen Ihnen gerne weiter.
