Abstract
Abstract. The availability of datasets providing information on the spatial and temporal evolution of greenhouse gas concentrations is of high relevance for the development of reliable climate simulations. However, current gas detection technologies do not allow for obtaining high-quality data at intermediate spatial scales with high temporal resolution. In this regard the deployment of a wireless gas sensor network equipped with in situ gas analysers may be a suitable approach. Here we present a novel, non-dispersive infrared absorption spectroscopy (NDIR) device that can possibly act as a central building block of a sensor node to provide high-quality data of carbon dioxide (CO2) concentrations under field conditions at a high measurement rate. Employing a gas-based, photoacoustic detector we demonstrate that miniaturized, low-cost, and low-power consuming CO2 sensors may be built. The performance is equal to that of standard NDIR devices but at a much reduced optical path length. Because of the spectral properties of the photoacoustic detector, no cross-sensitivities to humidity exist.
Highlights
The Earth’s climate is influenced by a complex interplay of processes occurring on land, ocean, and in the atmosphere (Bouwman, 1999)
We present a novel, non-dispersive infrared absorption spectroscopy (NDIR) device that can possibly act as a central building block of a sensor node to provide high-quality data of carbon dioxide (CO2) concentrations under field conditions at a high measurement rate
Numerous observations currently imply that the recent, anthropogenic release of large quantities of greenhouse gases (GHGs) into the atmosphere has shifted the balance related to natural biogeochemical cycles
Summary
The Earth’s climate is influenced by a complex interplay of processes occurring on land, ocean, and in the atmosphere (Bouwman, 1999). Numerous observations currently imply that the recent, anthropogenic release of large quantities of greenhouse gases (GHGs) into the atmosphere has shifted the balance related to natural biogeochemical cycles Associated with this is the strengthening of the greenhouse effect which has triggered an increase in the global mean temperature (Schuur et al, 2015; Solomon et al, 2009). The related high costs result in poor surface coverage and coarse spatial resolution In this contribution, an optical sensing technology using so-called non-dispersive infrared absorption (NDIR) spectroscopy and employing a photoacoustic detector is proposed as a central building block for ground-based, wireless gas sensor networks by which current restrictions could be overcome. We present a simulation comparing the sensitivity of standard NDIR and photoacoustic-based NDIR to highlight the potential for miniaturization when using a gas-based detector
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