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Anemometer for e.g. helicopter, has optical amplifier receiving light beam from laser and delivering pre-amplified light beam to optical coupler which provides light beams to light reference medium and detect Doppler shift
Anemometer for e.g. helicopter, has optical amplifier receiving light beam from laser and delivering pre-amplified light beam to optical coupler which provides light beams to light reference medium and detect Doppler shift
The anemometer has an optical amplifier (52) with an input receiving a light beam from a laser (50) and an output delivering pre-amplified light beam to an input of an optical coupler (54). The coupler has two outputs providing a light beam to light a reference medium and a reference light beam to detect Doppler shift, from the pre-amplified beam. Aircraft speed is determined by frequency deviation between the beams of the coupler.
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