Imaging doppler lidar for wind turbine wake profiling
| DWPI Title: Imaging Doppler lidar (IDL) for wind velocity profiling in wind turbine wake, has imaging receiver that detects scattered laser light, and has variable gate delay at repetition frequency of laser transmitter for range-gating detected light |
| Abstract: An imaging Doppler lidar (IDL) enables the measurement of the velocity distribution of a large volume, in parallel, and at high spatial resolution in the wake of a wind turbine. Because the IDL is non-scanning, it can be orders of magnitude faster than conventional coherent lidar approaches. Scattering can be obtained from naturally occurring aerosol particles. Furthermore, the wind velocity can be measured directly from Doppler shifts of the laser light, so the measurement can be accomplished at large standoff and at wide fields-of-view. |
| Use: Imaging Doppler lidar (IDL) for wind velocity profiling in wind turbine wake. |
| Advantage: Provides a remote sensing lidar that can measure high speed, vector wind velocities with good range resolution in the wake of a wind turbine. The short optical pulses that illuminate the scene and the precise time-of-flight measurements of the pulse reflections from aerosols in the scene enable accurate distance information that provides the third spatial dimension normally absent when images are recorded using only ambient reflected light. The laser transmitter should have an adequate energy per pulse to provide sufficient signal-to-noise at the receiver, a high repetition rate to capture transient formations in the flow, and a large enough tuning range to locate a strong absorption feature of the frequency discriminating cell. |
| Novelty: The IDL includes a laser transmitter (11) that provides a pulsed, narrow linewidth laser light (14) to flood illuminate a scene comprising aerosol particles moving at a velocity. A frequency discriminator measures the Doppler frequency shift of laser light scattered from the moving aerosol particles. An imaging receiver (16) detects the scattered laser light, and has a variable gate delay at the repetition frequency of the laser transmitter for range-gating the detected scattered laser light. |
| Filed: 4/16/2014 |
| Application Number: US14254555A |
| Tech ID: SD 12458.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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