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Industry News


Meteorological equipment specialists Biral has launched new visibility test plaques for wind turbine aviation obstruction lights.

Visibility sensors are frequently used on wind turbines to adjust the brightness of aviation obstruction lights. This way, the brightness of the light is reduced as the meteorological conditions improve, visibility increases and the light pollution caused to residents is greatly reduced.

These newly developed test plaques demonstrate the correct operation of the aviation obstruction lights by reproducing the required visibility in the Biral sensor and triggering the change of brightness in the obstruction lights as the visibility changes.

The test plaque is supplied to a customer specified, pre-configured visibility value. These test plaques can be fitted to any Biral SWS or VPF sensor and utilize the mounting points used by the calibration plaques. Each test plaque forces the Biral visibility sensor to report a known Meteorological Optical Range (MOR) as ascribed to each plaque. This MOR value is equivalent to a known visibility value.

This MOR output will then cause the lighting control system to adjust the brightness of the aviation obstruction lights. The MOR value for each test plaque is specified by the customer at the time of purchase. The MOR range available is 0.5km (0.3 miles) to 7km (4.3 miles) in increments of 0.1km (0.06 miles). These test plaques are for use as a simulator only and are not designed for the calibration of Biral sensors. - May 2018

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