High quality data acquisition on the turbine mast
Current wind turbines have even larger wings and hub heights, thus making it necessary to record bat activity not from the nacelle alone. Our mast mic can be installed for example at the lower wing tip, placed in a hole in the mast. In cooperation with mast producers and turbine producers we have developed a solution tha combines microphone as well as test signal speaker in a single small housing. This allows standardized recording of activity at any height along the mast.
The mast mic consists of a plastic cylinder (28 mm to 60 mm) and can be adjusted in its position using a threaded rod (see picture). Its maximal adjustment is ca. 30 cm. It is fixed to the mast inner wall using an aluminium plate.For installation a 30 mm hole must be either drilled or already available at the mast. It can be inclined 10° downwards to disable rain water running into the hole.
We recommend that you plan the installation with the turbine manufacture as early as possible. The hole usually can be planned when the mast is build and thus no drilling is necessary.
To further secure the microphone against weather influences we recommend an installation out of the main weather direction. This also minimizes problems due to the fine spray the wing tips may produce agt higher speeds.
Depending on the actual legal requirements the microphone may get installed in lower air spaces. To reduce recording activity close to the ground the threshold of the batcorder may be adjusted directly or afterwards when analyzing the recordings.