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Turbulence detected by lidar

30.03.2018

The American aircraft manufacturer Boeing, together with the Japan Aerospace Exploration Agency (JAXA) and the transport company FedEx, has begun flight tests of an aviation lidar designed to detect clear-sky turbulence.

Clear sky turbulence is a fairly dangerous atmospheric phenomenon, which is uneven air currents in the Earth's atmosphere. Unlike other types of turbulence, it is almost not accompanied by cloudiness, but is observed in clear skies or a small amount of upper clouds. Therefore, it is almost impossible to detect it in advance - both visually and with the help of radars on board the aircraft.

However, the prediction of clear air turbulence is very important, as it has a strong, sometimes catastrophic effect on aircraft. It is very difficult due to intermittency, sharp localization in the surrounding flow, and great variability in the size and duration of the phenomenon. These features complicate not only the forecast, but also the very study of this type of turbulence.

Due to the lack of the ability to directly observe clear-sky turbulence visually or with the help of radar, its prediction so far has been limited to the detection of indirect signs of an increased probability of the presence of turbulence zones. Now Boeing and JAXA have built a lidar that can track the movement of tiny particles in the air, as well as detect irregularities in the air mass.

Due to this, it allows detecting clear-sky turbulence zones with a fairly high probability. The FedEx Boeing 777F cargo plane is taking part in the tests, on which a lidar was placed behind the wing console just above its plane. The developers claim that the device is able to detect zones of clear-sky turbulence at a distance of 17,5 kilometers, which gives pilots about 60 seconds to take action.

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