ArticleSensors (Basel, Switzerland)2020
Intrinsic Spectral Resolution Limitations of QEPAS Sensors for Fast and Broad Wavelength Tuning.
Article in Sensors (Basel, Switzerland), 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed, 16 citations in OpenAlex.
- Vibrational Fingerprinting of Gas Mixtures Using COCO-QEPAS.Sensors (Basel, Switzerland) · 2026Article
- Quartz-Enhanced Photoacoustic Spectroscopy Assisted by Partial Least-Squares Regression for Multi-Gas Measurements.Sensors (Basel, Switzerland) · 2023Article
- Dual-comb quartz-enhanced photoacoustic spectroscopy.Photoacoustics · 2022Article
- High-concentration methane and ethane QEPAS detection employing partial least squares regression to filter out energy relaxation dependence on gas matrix composition.Photoacoustics · 2022Article
- Calibration of Quartz-Enhanced Photoacoustic Sensors for Real-Life Adaptation.Molecules (Basel, Switzerland) · 2021Article
- A NDIR Mid-Infrared Methane Sensor with a Compact Pentahedron Gas-Cell.Sensors (Basel, Switzerland) · 2020Article
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Authors and funding
8 authors at 1 institution in 1 country.
Funding
Abstract
Quartz-enhanced photoacoustic sensing is a promising method for low-concentration trace-gas monitoring due to the resonant signal enhancement provided by a high-Q quartz tuning fork. However, quartz-enhanced photoacoustic spectroscopy (QEPAS) is associated with a relatively slow acoustic decay, which results in a reduced spectral resolution and signal-to-noise ratio as the wavelength tuning rate is increased. In this work, we investigate the influence of wavelength scan rate on the spectral resolution and signal-to-noise ratio of QEPAS sensors. We demonstrate the acquisition of photoacoustic spectra from 3.1 μm to 3.6 μm using a tunable mid-infrared optical parametric oscillator. The spectra are attained using wavelength scan rates differing by more than two orders of magnitude (from 0.3 nm s-1 to 96 nm s-1). With this variation in scan rate, the spectral resolution is found to change from 2.5 cm-1 to 9 cm-1. The investigated gas samples are methane (in nitrogen) and a gas mixture consisting of methane, water, and ethanol. For the gas mixture, the reduced spectral resolution at fast scan rates significantly complicates the quantification of constituent gas concentrations.
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