Windar Photonics A/s

Danmarks Tekniske Universitet

Technical University of Denmark

Peter John Rodrigo

Christian Pedersen

Michael Linde Jakobsen

Steen Hanson

Theis Faber Quist Iversen

Jørgen Korsgaard Jensen

Qi Hu

Theis Iversen

A system for measuring velocity of particles such as particles in air is a Light Detection and Ranging (LIDAR) system, having a micro-electro-mechanical-system (MEMS).

LIDAR based on MEMS

The invention relates to a coaxial direct-detection LIDAR system for measuring velocity, temperature and/or particulate density. The system comprises a laser source for emitting a laser light beam having a lasing center frequency along an emission path. The system further comprises an optical delivery system arranged in the emission path of the laser source, the optical delivery system being arranged for delivering the laser light beam in a measuring direction, the optical delivery system further being configured for collecting a return signal backscattered along the measuring direction. Finally, the system comprises a detector system arranged to receive the return signal from the optical delivery system, the detector system comprising a narrowband optical filter and a detector, the narrowband optical filter having a filter center frequency of a pass-band, wherein the center lasing frequency and/or the center filter frequency may be scanned. The invention further relates to an aircraft airspeed measurement device, and a wind turbine airspeed measurement device comprising the LIDAR system.

Coaxial direct-detection LIDAR-system

The present invention relates to a low-cost LIDAR system. The system may be integrated in a wind turbine for measurement of the approaching wind field. One embodiment relates to a LIDAR system comprising a beam generating section adapted for generating a substantially linearly polarized output beam, and a beam steering section comprising a first optical device for controllably altering the polarization of the output beam, said first optical device in optical connection with a first polarizing beam splitter, said beam steering section adapted for directing the outputbeam interchangeably between a first direction and a second direction.

Multiple directional LIDAR system

A vector velocimeter includes a laser emitting a measurement beam with a wavelength &#x3bb;, for illumination of an object in a measurement volume to create a signal beam, a reference beam generator generating a reference beam, and a first detector arranged such that the signal beam and the reference beam, propagating at a first angle &#x3b8; relative to the signal beam, are incident thereon. The first detector includes an array of first detector elements to convert the intensity of the interfering signal beam and reference beam incident thereon into an oscillating electronic detector element signal when the fringe pattern formed thereby moves across the first detector array. A signal processor generates a velocity signal corresponding to a first velocity component of movement of the object in the measurement volume in the longitudinal direction thereof based on the electronic detector element signals from each of the first detector elements.

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Roskilde, Denmark

Peter John Rodrigo