A portable infrasound generator

Infrasound Laboratory, University of Hawaii, Kailua-Kona, Hawaii 96740, USA.
The Journal of the Acoustical Society of America (Impact Factor: 1.5). 05/2009; 125(4):EL148-51. DOI: 10.1121/1.3093797
Source: PubMed


The rotary subwoofer is a novel low frequency transducer capable of efficiently generating infrasound from a compact source. A field-deployable version of this device may find application as a calibration source for infrasound arrays of the International Monitoring System (IMS) [(2001). The Global Verification Regime and the International Monitoring System (CTBTO Preparatory Commission Vienna International Centre, Vienna, Austria)]. A prototype tested at the IMS infrasound array I59US demonstrated the ability to insonify all elements of the array from a standoff distance of 3.8 km. Signal-to-noise ratios of continuous wave signals ranged from 5 to 15 dB, indicating the utility of this source to transmit controllable infrasound signals over distances of 5 km.