Infrasound Technology Workshop 2024 (ITW2024)

Session

Measurement Systems

S2

4 Nov 2024, 11:30

M2 (VIC)

184. Exploiting the outcomes of recent research in metrology for the benefit of the IMS.

04/11/2024, 11:30

Measurement Systems

oral

The EURAMET Infra-AUV project ended in Dec-2023 and made significant progress on laboratory-based metrology for the calibration and traceability of seismic and infrasound sensors, and conducted several field studies providing new insights for on-site calibration. These advances in metrology are now ready to be exploited for maximum advantage at CTBTO. Perhaps the most significant of the recent...

165. Infrasound uncertainty propagation: ensuring traceability from the laboratory to the field

04/11/2024, 11:55

Measurement Systems

oral

Confidence in the quality of infrasound measurements is at the heart of the operational requirements linked to the detection and assessment of geophysical and industrial events. The entire measurement process, from laboratory calibration to the field, must be considered to estimate the confidence level of the measurement through the associated uncertainty. As part of the European Infra-AUV...

156. Wind Noise Reduction System Impacts on Sensor Cavity Temperature

04/11/2024, 13:45

Measurement Systems

oral

Earlier studies into the impacts of environmental variables on infrasound sensors have demonstrated that the frequency response can be susceptible to temperature changes. Infrasound stations are typically configured to prioritize thermal stability, either by installation in an underground vault or the use of an insulated enclosure, and the air temperature around the sensor can be monitored. ...

153. Assessing the Effects on Response of Infrasound Sensors Deployed in Harsh Desert Environments

04/11/2024, 14:10

Measurement Systems

oral

We recently conducted a limited frequency response calibration of 43 Hyperion 3000 and 5000 series infrasound sensors. These sensors have been utilized in a number of temporary deployments in the high desert of the Nevada National Security Site (NNSS), northwest of Las Vegas, Nevada, USA. The sensors were not installed in a manner consistent with an IMS station installation; rather these...

119. Infrasound Sensor Performance at Extreme Temperatures and Low Frequencies

04/11/2024, 14:35

Measurement Systems

oral

Earlier evaluations of infrasound sensor performance have shown that frequency response can be impacted by environmental conditions, including both temperature and barometric pressure, with calibrations performed in laboratory and field environments. These laboratory evaluations were limited to temperatures as cold as -20 C and from 0.1 to 10 Hz. Since then, investigations into frequency...

173. Large-chamber primary calibration for microbarometers

04/11/2024, 15:30

Measurement Systems

oral

In previous work, the National Center for Physical Acoustics at the University of Mississippi designed and built a large chamber for secondary (referenced) calibration of microbarometers. Sandia National Laboratories (SNL) then refined and implemented this chamber at their Facility for Acceptance, Calibration, and Testing (FACT) site. This large (1400 L) steel chamber incorporates two moving...

183. Establishing traceability for Infrasound: Calibration Innovations and Inter-Laboratory Comparisons from the INFRA-AUV Project

04/11/2024, 15:55

Measurement Systems

oral

For any physical measurement to be meaningful, it must ultimately be traceable to an absolute realization of the parameter, or primary standard. Waveform measurements are no exception , in particular the infrasound. However, until recently, no primary standards existed for infrasound at the frequencies of interest to the IMS. The INFRA-AUV project aimed to develop both primary and secondary...

177. Is calibration really worth the effort?

04/11/2024, 16:20

Measurement Systems

oral

The calibration of IMS infrasound sensors has been the subject of intense research in recent years, but are the benefits really worth all the effort? From an accuracy perspective alone, it is difficult to argue the case for calibration. However, the question is intentionally provocative, as the rationale for calibration is not only about accuracy. For traceable calibration, the unbroken link...