At the end of August, project partners from CEA visited the infrasound station IS26 in the Bavarian Forest, operated by BGR, to set up an experiment co-located to an existing element of IS26 (Fig. 2), that will continue until the middle of October. The co-location of the experimental set-up will allow for the comparison of the experimental system to the normally operational IS26 element, that will provide ‘ground-truth’ measurements.
The goals of the experiment, which consists of an experimental wind-noise reduction system (WNRS) and a co-located reference sensor, are to perform a basic calibration of the temporary system and to test the effects of several system defects on the calibration response. The changes to configuration of the WNRS (blockages and disconnected pipes) are implemented approximately every 10 days by BGR through visits to the site.
In addition, the partners of CEA had the opportunity to test a mobile device for the on-site calibration of several microbarometers at different locations in the field (Fig. 3). Two of BGRs microbarometers, previously primarily calibrated at the CEA laboratories, were also calibrated on-site for comparison before being reinstalled in their original locations, now allowing traceable on-site calibrations of the detectors.
Fig. 2: Experimental system located next to one operational element of IS26. a) shows the two sensors in the background with part of one rosette of the WNRS. b) shows both the sensor unter test (top) and the reference sensor (bottom).
Fig. 3: Testing a mobile device for the on-site calibration in different conditions: a) in the central facility, b) in a forested area, and c) in an open area.
