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Fig. 2. A tagged fin whale, showing placement of the bioacoustic probe during
surfacing. Superimposed onto the image are the orthogonal axes of the
accelerometer. The long axis of the tag was largely parallel with the
longitudinal axis of the animal on all successful deployments. The
x-axis is parallel with the long axis of the tag (red) and the
y-axis extends radially on the tag (blue). Each axis detects static
acceleration (Ax, Ay) in order to
estimate the orientation of the animal in dimensions as defined by rotation
about the y-axis, pitch (
), and about the x-axis,
roll (
). An axis oriented parallel to gravity would result in 1.0
g recorded by the accelerometer, whereas an axis perpendicular
to gravity would produce a 0.0 g accelerometer signal.
Small-scale, dynamic oscillations detected by the x-axis were
interpreted as fluking. The R/P FLIP, visible on the horizon, served
as a research platform for visual and acoustic marine mammal monitoring
operations.
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