Field test of a lidar wind profiler
article
Wind speeds and wind directions are measured remotely using
an incoherent backscatter lidar system operating at a wavelength of
1.06 mm with a maximum repetition rate of 13 Hz. The principle of the
measurements is based on following detectable atmospheric structures,
which are transported by the wind (Taylor’s hypothesis). The characteristic
size and lifetime of these structures are also inverted from the data.
Initially, the lidar was pointed in the horizontal plane parallel to the wind
direction to measure the horizontal wind speed from the displacement of
the atmospheric structures along the lidar axis. Subsequently, the sensor
was expanded with a time synchronous lidar that operated at an azimuth
angle of about 15 deg with respect to the direction of the first lidar. The
horizontal wind vector could then be measured over ranges of about 1.5
km using the geometry of the dual lidar and the transit times of the
atmospheric structures between the two lidar axes. Results obtained
with this dual lidar are comparable with the in situ measured wind vector.
Finally, vertical profiles of the wind vector are measured to altitudes of
about 1 km. This is realized by operating one lidar in the triangulation
mode using a fast adjustable platform. The results obtained in this mode
are in good agreement with in situ measured data from sensors on a
213-m-high meteorologically instrumented mast and with data provided
by an acoustic sounder
an incoherent backscatter lidar system operating at a wavelength of
1.06 mm with a maximum repetition rate of 13 Hz. The principle of the
measurements is based on following detectable atmospheric structures,
which are transported by the wind (Taylor’s hypothesis). The characteristic
size and lifetime of these structures are also inverted from the data.
Initially, the lidar was pointed in the horizontal plane parallel to the wind
direction to measure the horizontal wind speed from the displacement of
the atmospheric structures along the lidar axis. Subsequently, the sensor
was expanded with a time synchronous lidar that operated at an azimuth
angle of about 15 deg with respect to the direction of the first lidar. The
horizontal wind vector could then be measured over ranges of about 1.5
km using the geometry of the dual lidar and the transit times of the
atmospheric structures between the two lidar axes. Results obtained
with this dual lidar are comparable with the in situ measured wind vector.
Finally, vertical profiles of the wind vector are measured to altitudes of
about 1 km. This is realized by operating one lidar in the triangulation
mode using a fast adjustable platform. The results obtained in this mode
are in good agreement with in situ measured data from sensors on a
213-m-high meteorologically instrumented mast and with data provided
by an acoustic sounder
TNO Identifier
94948
Source
Optical Engineering, 35(November), pp. 3074-3083.
Pages
3074-3083
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