New methods for the calibration of optical resonators

• Verfasst von: Finkenzeller, Henning [VerfasserIn]
• Verfasst von: Pöhler, Denis [VerfasserIn]
• Verfasst von: Horbanski, Martin [VerfasserIn]
• Verfasst von: Lampel, Johannes [VerfasserIn]
• Verfasst von: Platt, Ulrich [VerfasserIn]
• Titel: New methods for the calibration of optical resonators
• Titelzusatz: integrated calibration by means of optical modulation (ICOM) and narrow-band cavity ring-down (NB-CRD)
• Verf.angabe: Henning Finkenzeller, Denis Pöhler, Martin Horbanski, Johannes Lampel, Ulrich Platt
• E-Jahr: 2023
• Jahr: 14 March 2023
• Umfang: 14 S.
• Illustrationen: Illustrationen
• Fussnoten: Gesehen am 19.12.2023
• Titel Quelle: Enthalten in: Atmospheric measurement techniques
• Ort Quelle: Göttingen : Copernicus Publ., 2009
• Jahr Quelle: 2023
• Band/Heft Quelle: 16(2023), 5, Seite 1343-1356
• ISSN Quelle: 1867-1381
• DOI: doi:10.5194/amt-16-1343-2023
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1843117010

Abstract

Optical resonators are used in spectroscopic measurements of atmospheric trace gases to establish long optical path lengths L with enhanced absorption in compact instruments. In cavity-enhanced broad-band methods, the exact knowledge of both the magnitude of L and its spectral dependency on the wavelength λ is fundamental for the correct retrieval of trace gas concentrations. L(λ) is connected to the spectral mirror reflectivity R(λ), which is often referred to instead. L(λ) is also influenced by other quantities like broad-band absorbers or alignment of the optical resonator. The established calibration techniques to determine L(λ), e.g. introducing gases with known optical properties or measuring the ring-down time, all have limitations: limited spectral resolution, insufficient absolute accuracy and precision, inconvenience for field deployment, or high cost of implementation. Here, we present two new methods that aim to overcome these limitations ...