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WP 5 - Design of a portable sensor and field measurements

Fig. 1. Spectra of the molecules of interest within ATMO-SENSE including water background matrix from Hitran database [1].

In this final Workpackage the laboratory based FP-PTI system is integrated into a prortable setup. This includes the verification of the laboratory calibration in field tests, the evaluation of possible inteferences in the field like temperature, sound, matrix composition etc., single- and multi-gas measurements and the evalutation of the long term stability in the field

In order to move the sensor out of the laboratory a redesign of the optics and any mechanical parts (sampling system) is conducted. The aim is to integrate the whole setup on a small footprint (~shoebox-sized) and to attach an industrial PC for sensor operation, data acquisition and analysis (LabView-based). This includes e.g. the implementation of a circuit board hosting multiple lock-in amplifiers, further reducing the sensor size significantly.
Experience on how to achieve this is available at PAG from a previous gas sensing project in the field of quartz enhanced photoacoustic spectroscopy.

After a careful calibration in the laboratory again using the gas mixing station, the ATMO-SENSE gas sensor is taken to the field. Preferentially, we aim to perform our measurements along with existing measurement stations so that the results can be compared to those of reference methods. In doing so, the performance in terms of analytical figures of merit are evaluated and compared to the laboratory system.

It is planned to start with one single analyte (CO2 or N2O) and to expand the studies to the simultaneous measurement of up to three analytes including ozone. In an optimum case this will be straight forward considering the on-axis beams provided by the surface emitting ring-in-ring laser structures.