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Showing 1 to 8 of 8 for “"Doppler LIDAR"”.
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Techniques for low coherence pulsed Doppler lidar
… and the occasional death. The ability of a lidar system to make wind speed measurements and detect wind shear and turbulence has been known for some time. However, lidar systems are still not commercially viable as early warning systems in aircraft and at airports. The main reason is the …
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Field Evaluation of Doppler LIDAR Sensors for Early Assessment of Track Instability
… purpose of this study is to evaluate the use of Doppler Lidar sensors for assessing track weakening that would indicate early stages of track instability. Such track weakening could lead to gage widening or track buckling due to rail thermal expansion. A series of tests are performed at the …
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The Application of Doppler LIDAR Technology for Rail Inspection and Track Geometry Assessment
The ability of a Doppler LIDAR (Light Detection and Ranging) system to measure the speed of a moving rail vehicle in a non-contacting manner is extended to capture the lateral and vertical irregularities of the track itself and to evaluate the rail track quality. Using two pairs of lenses to …
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Application of Multifunctional Doppler LIDAR for Non-contact Track Speed, Distance, and Curvature Assessment
… of feasibility, applicability, and accuracy of Doppler Light Detection And Ranging (LIDAR) sensors as non-contact means for measuring track speed, distance traveled, and curvature. Speed histories, currently measured with a rotary, wheel-mounted encoder, serve a number of useful purposes, one …
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Boundary layer temporal evolution observed by doppler lidar upwind of a lake-effect snow event
A Halo Photonics Doppler Wind LiDAR (LiDAR) was deployed during a lake-effect snow event over Lake Michigan to develop a method of processing and reviewing the data collected by the LiDAR, create a conceptual model of the temporal evolution of the atmospheric boundary layer on the lake’s upwind …
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Investigation of Mountain Waves in the Mesosphere over the Andes Mountains
… atmosphere. The imager is located at the Andes Lidar Observatory (ALO) at Cerro Pachón, Chile (30°S, 71°W), which also houses a Na Doppler Lidar and other passive optical instruments. This thesis work reports the successful identification of numerous strong mountain wave events during the …
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Innovative Applications of Laser Remote Sensing of Gases, Aerosols and Wind
… using a scanning eye-safe elastic micro-pulse lidar system. Two case studies are presented in which different methodologies are applied in order to estimate the backscatter and extinction coefficients. These observations demonstrate capabilities to monitor local emission sources and rapid …
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Er:YAG Lasers for Methane and Wind Sensing
… in an Integrated Path Differential Absorption LIDAR (IPDA) LIDAR system capable of detecting fugitive emissions over natural gas pipelines from a light aircraft. The goal for this system is a dual-pulsed Q-switched Erbium-doped Yttrium Aluminium Garnet (Er:YAG) laser source that produces two …