Produkt-Neuheit

Noise pollution caused by wind turbines is becoming a growing problem, not only in Germany. Due to noise that is harmful to health, it cannot be ruled out that the operating time of wind turbines and thus also the power generation will have to be limited.

Collecting reliable and continuous noise and wind data can help to optimize the use of wind energy and minimize noise pollution.

Permanent noise monitoring stations help to perceive the overall picture of the noise situation, whereby noise situations vary greatly in terms of wind intensity and direction.

The boundary layer and the weatherproof power supply unit are specifically developed extensions in order to record the sound emission of wind power stations with measuring microphones pursuant to DIN EN 61400-11.

The newly developed interface facilitates transportation to the place of use.

Additionally, the GF 1 is suitable for determining emission-relevant sound power levels in open spaces, e.g. measurements at power stations, construction sites, filtration and cooling plants among others.

Due to the operation near the ground, unwanted influences of the measurement results by reflections of the ground are avoided. The low wind speed near the ground also has the effect of reducing the wind noise at the microphone.

Acoustical specifications

Together with the impregnated secondary windscreen, the primary windscreen of the GF 1 ensures a broadband reduction of the induced wind noise at the microphone by 40dB.

Due to the acoustic effect of the sound-reflecting boundary layer, the microphone sensitivity increases by 6 dB as inherent to its functional principle. Thus, an overall improvement of the signal-to-noise ratio of approx. 46 dB can be achieved.

As measuring microphone element, class 1 measuring microphones are suitable, which consist of measuring microphone cartridges with a frequency range from 20 Hz to a minimum of 10 kHz, a dehumidifier adaptor and a measuring microphone preamplifier with 200 V or IEPE supply.

Electrical specifications

The WN1 is a weatherproof power supply unit with the measuring microphone power supply unit MN921. It provides an operating voltage for conventional measuring microphones (7-pol.LEMO®), as well as for IEPE measuring microphones. It can be operated with accumulators, batteries or mains voltage. The amplification of the microphone signal can be set using a rotary switch. The integrated line driver allows a transmission of the microphone signals over a cable length sufficient for measurements on wind power stations.

Mechanical specifications

The structural design of the GF1 allows a simple calibration with a sound calibrator. With the divisible ground plate and the secondary windscreen reduced to an optimum for function and handling, transportation in a compact transport case is possible. With the impregnated secondary windscreen, the ground plate coated with varnish and the weatherproof power supply unit, GF1 and WN1 form a weatherproof system for the standard-conforming sound emission measurement of wind power stations.