Mihan H. McKenna

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The Lac-du-Bonnet infrasound station, IS-10, and the Minnesota iron mines 390 km to the southeast are ideally located to assess the accuracy of atmospheric profiles needed for infrasound modeling. Infrasonic data from 2003 associated with explosions at the iron mine were analyzed for effects of explosion size and atmospheric conditions on observations with(More)
Infrasound data were collected using portable arrays in a region of variable terrain elevation to quantify the effects of topography on observed signal amplitude and waveform features at distances less than 25 km from partially contained explosive sources during the Frozen Rock Experiment (FRE) in 2006. Observed infrasound signals varied in amplitude and(More)
Microbarometers have conventionally been used to detect infrasound. Pipe arrays, used in conjunction with microbarometers, provide noise reduction by averaging wind noise over a large aperture. In recent years, distributed arrays have been used for the same effect. In addition to reducing wind noise via spatial averaging, these arrays have the ability to(More)
Infrasound can propagate very long distances and remain at measurable levels. As a result infrasound sensing is used for remote monitoring in many applications. At local ranges, on the order of 10 km, the influence of the presence or absence of forests on the propagation of infrasonic signals is considered. Because the wavelengths of interest are much(More)
The work described herein discusses the application of a frequency-wavenumber signal processing technique to signals from rectangular infrasound arrays for detection and estimation of the direction of travel of infrasound. Arrays of 100 sensors were arranged in square configurations with sensor spacing of 2 m. Wind noise data were collected at one site.(More)
Tunnels are an increasing problem for securing the borders. Due to hazards inherent in assessing these tunnels, robotic reconnaissance would play an important role in gathering vital information regarding tunnel use and closure logistics. Since conventional robotics platforms do not meet the threat needs, the Unmanned Tunnel Exploitation (UTE) research used(More)