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Continuous-Wave Doppler-Lidar System using a Synthetic Broadband Laser Source

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Continuous-Wave Doppler-Lidar System using a Synthetic Broadband Laser Source (Tienda española)

Thomas Waterholter (Autor)


Indice, PDF (43 KB)
Lectura de prueba, PDF (82 KB)

ISBN-13 (Impresion) 9783736990593
ISBN-13 (E-Book) 9783736980594
Idioma Inglés
Numero de paginas 130
Laminacion de la cubierta mate
Edicion 1. Aufl.
Lugar de publicacion Göttingen
Lugar de la disertacion Hamburg-Harburg
Fecha de publicacion 03.08.2015
Clasificacion simple Tesis doctoral
Area Física de materia condensada ( incluyendo física de cuerpos solidos, optica)
Técnica de regulación y medida
Ingeniería eléctrica
Ingeniería eléctrica general
Ingeniería de energía
Palabras claves Doppler, Lidar, OLCR, Coherence, Interferometry, DIAL, Vibrometry, Atmospheric optics, Fiber optics, Remote sensing and sensors, Aerol detection, Atmosperic scattering, Backscattering

In this thesis a new concept of continuous wave (CW) Lidar for detection of scattered light from atmospheric aerosol particles is presented. It is useful in particular for remote sensing of wind velocities but can be easily applied to the fields of remote vibrometry and differential absorption lidar (DIAL) as well. It is based on a low-coherence interferometric setup powered by a synthetic broadband laser source with Gaussian power density spectrum. The laser bandwidth is electronically adjustable and determines the spatial resolution which is independent of range. The Lidar system inherently offers strong discrimination between signal contributions from different locations and has no moving parts. The location to be re solved can be shifted numerically after the measurementmeaning that a singlemeasurement already contains the full range information. These features of constant resolution and numerical range scanning are in sharp contrast to conventional CW Lidar systems. Despite strong suppression of signals that are not of interest, spurious reflections from inside the setup can be extremely large when compared to the weak scattering signals to be detected and should be kept as low as possible. To remove the remaining impact of such disturbances, the system offers an elegant solution through a numerical shift/filtering/backshift procedure.