Philipp Scheidegger
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A compact mid-IR laser absorption spectrometer for water vapor isotopologue measurements in the upper air Open
Water vapor is the main natural greenhouse gas controlling the Earth's energy balance. It significantly influences atmospheric chemistry and climate dynamics, particularly in the upper troposphere and lower stratosphere (UTLS), which makes…
Advances in lightweight laser-based analyzers for flying platforms Open
Laser absorption spectroscopy is a widely adopted technique for high-precision trace-gas analysis across a broad range of applications. However, commercial instruments remain too bulky for deployment on flying platforms, such as UAVs or ba…
The ALBATROSS spectrometer for balloon-borne measurements of UTLS water vapor: Laboratory and in-flight validation Open
The amount of water vapor (H2O) in the upper troposphere-lower stratosphere (UTLS) plays a critical role for the Earth's radiative balance. However, due to its low abundance, accurate measurements of H2O in this region (~8‒25 km altitude) …
Multispecies mid-IR laser absorption spectroscopy for drone-based measurements of ship emissions Open
The accentuated global market substantially increased worldwide shipping and thus the related greenhouse gas (GHG) emissions. Without effective global measures, emissions from maritime transport will soon undermine any attempts to mitigate…
View article: Rapid Detection of Volatile Organic Compounds by Switch–Scan Tuning of Vernier Quantum-Cascade Lasers
Rapid Detection of Volatile Organic Compounds by Switch–Scan Tuning of Vernier Quantum-Cascade Lasers Open
Volatile organic compounds (VOCs) exhibit typically broad and mutually overlapping ro-vibrational absorption fingerprints. This complexity has so far limited the applicability of laser-based spectroscopy for VOC measurements in complex gas…
A High-Precision Mid-Infrared Spectrometer for Ambient HNO3 Measurements Open
Precise and accurate measurements of ambient HNO3 are crucial for understanding various atmospheric processes, but its ultra-low trace amounts and the high polarity of HNO3 have strongly hindered routine, widespread, direct measurements of…
Step-Scan Tuning of Vernier Quantum-Cascade Lasers for Rapid Detection of Volatile Organic Molecules Open
We demonstrate a fast and flexible driving scheme that fully exploits the potential of extended-tuning quantum-cascade lasers (QC-XT). Integrated in a spectroscopic setting, it enables the sensitive and selective detection of volatile orga…
Compact and lightweight mid-infrared laser spectrometer for balloon-borne water vapor measurements in the UTLS Open
We describe the development, characterization, and first field deployments of a quantum cascade laser direct absorption spectrometer (QCLAS) for water vapor measurements in the upper troposphere and lower stratosphere (UTLS). The instrumen…
Advances in High-Precision NO2 Measurement by Quantum Cascade Laser Absorption Spectroscopy Open
Nitrogen dioxide (NO2) is a major tropospheric air pollutant. Its concentration in the atmosphere is most frequently monitored indirectly by chemiluminescence detection or using direct light absorption in the visible range. Both techniques…
High-precision laser spectrometer for multiple greenhouse gas analysis in 1 mL air from ice core samples Open
The record of past greenhouse gas composition from ice cores is crucial for our understanding of global climate change. Future ice core projects will aim to extend both the temporal coverage (extending the timescale to 1.5 Myr) and the tem…
A compact QCL spectrometer for mobile, high-precision methane sensing aboard drones Open
A compact and lightweight mid-infrared laser absorption spectrometer has been developed as a mobile sensing platform for high-precision atmospheric methane measurements aboard small unmanned aerial vehicles (UAVs). The instrument leverages…
High precision laser spectrometer for multiple greenhouse gas analysis in 1 mL air from ice core samples Open
The record of past global background atmospheric greenhouse gas composition is crucial for our understanding of global climate change. The ”Beyond EPICA Oldest Ice Core” project is currently pushing the frontier of this knowledge forward b…
Compact and Lightweight Mid-IR Laser Spectrometer for Balloon-borne Water Vapor Measurements in the UTLS Open
We describe the development, characterization and first field deployments of a quantum cascade laser direct absorption spectrometer (QCLAS) for water vapor measurements in the upper troposphere and lower stratosphere. The instrument is suf…
A compact QCL spectrometer for mobile, high-precision methane sensing aboard drones Open
A compact and lightweight mid-IR laser absorption spectrometer has been developed as mobile sensing platform for high-precision atmospheric methane measurements aboard small, unmanned aerial vehicles (UAVs). The instrument leverages on two…
Mid-IR Laser Spectrometer for Balloon-borne Lower Stratospheric Water Vapor Measurements Open
Water vapor is the dominant greenhouse gas, and its abundance in the upper tropospheric/lower stratospheric region (UTLS, 8-25km altitude) is of great importance to the Earth's radiative balance. Reliable predictions of the climate evoluti…
High-precision ethanol measurement by mid-IR laser absorption spectroscopy for metrological applications Open
We report on the development and validation of a compact laser instrument using mid-IR direct absorption spectroscopy (DAS) for high-precision measurements of ethanol in breath-like air mixtures. Leveraging the intermittent continuous wave…
Mid-IR Laser Spectrometer for Balloon-borne Lower Stratospheric Water Vapor Measurements Open
A lightweight instrument has been developed to measure water vapor up to the lower stratosphere aboard meteorological balloons. The sensor relies on a segmented circular multipass cell which is especially suited for mobile field applicatio…
View article: Laser driving and data processing concept for mobile trace gas sensing: Design and implementation
Laser driving and data processing concept for mobile trace gas sensing: Design and implementation Open
High precision mobile sensing of multi-species gases is greatly demanded in a wide range of applications. Although quantum cascade laser absorption spectroscopy demonstrates excellent field-deployment capabilities for gas sensing, the impl…
Mid-IR spectrometer for mobile, real-time urban NO <sub>2</sub> measurements Open
Detailed knowledge about the urban NO2 concentration field is a key element for obtaining accurate pollution maps and individual exposure estimates. These are required for improving the understanding of the impact of ambient NO2 on human h…
View article: QCL absorption spectroscopy for lightweight and multi-species environmental applications
QCL absorption spectroscopy for lightweight and multi-species environmental applications Open
MIR spectroscopy using QCLs allows sensitive, selective, and fast detection of tracegases. Recent developments, including dual-wavelength QCLs and segmented circular optical cells, create tantalizing options for drone-based and multi-speci…
Spectroscopic real-time monitoring of NO <sub>2</sub> for city scale modelling Open
Detailed knowledge about the urban NO2 concentration field is a key element for obtaining accurate, individual exposure estimates. These are required for improving the understanding of the impact of ambient NO2 on human health and for rela…