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A. Lapworth

Abstract

The Cardington turbulence Probe system consists of a number of instrumented probes clamped to the tether cable of a 650-m3 kite balloon and has been in use for several years. A software method of correcting the data for the effects of transverse oscillations of the tether cable has recently been developed and is described. The original processing algorithm gave incorrect results in northerly winds, and a software modification for use in such conditions is also given. These corrections should be relevant to other systems where packages are mounted on the tether cable of a kite balloon and use a combination of magnetometer and inclinometers for orientation purposes.

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A. J. Lapworth and P. J. Mason

Abstract

A new instrument package has been developed to measure turbulence at various heights in the boundary layer. The package or “turbulence probe” is designed to be attached to the tethering cable of a balloon. In contrast to previous balloon borne turbulence probes, it uses inclinometers and magnetometers rather than a damped pendulum to determine the probe sensor orientations. Comparisons with a mast mounted sonic anemometer have shown that all three components of turbulence energy can be measured with a good accuracy, even in strong wind conditions. A system of several such probes can also provide accurate corrections for errors introduced by the inevitable translational motions of the tether cable.

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