A magnitude and direction, or a measure responsive thereto, of a velocity (V) of a first portion (17) of an atmosphere (20) are determined from at least first and second portions of scattered light (30) generated along a common beam of light (28) within the first portion (17) of the atmosphere (20) and received along linearly independent directions at locations that are relatively remote with respect to one another, at least one of which is relatively remote from a source (11) of the beam of light (28).

Atmospheric measurement system

At least one second beam of light from a first beam of light generated by a laser is directed into an atmosphere. Light therefrom scattered by molecules or aerosols in the atmosphere is collected by at least one telescope as at least one light signal, which together with a reference beam from the first beam of light are simultaneously processed by a Fabry-Perot etalon, and resulting fringe patterns are imaged onto a detector adapted to output a resulting at least one signal responsive thereto.

Optical air data system

Light (32) scattered by a portion of a fluid medium (16) illuminated by a beam (18) of substantially monochromatic light (14) is received within a field-of-view (34) nominally along an axis (36) oriented in a different direction (θ) relative to the beam (18) and processed by an interferometer (44) to generate a corresponding fringe pattern (60) that is detected and processed to generate at least one measure (A, M, u, t, B, p, Ts, V, ASR, 68) of the fluid medium (16) at a plurality of different ranges (R)

Range imaging lidar

A wind power generation evaluation system includes: a laser aerovane 100-300 that measures, with laser, the direction and velocity of wind at a distance from a wind power generator connected to an electric power system to predict the direction and velocity of wind at the wind power generator; a second aerovane 500 that measures them at the wind power generator; a wind power generation output calculation unit 400a that integrates a difference between power outputs calculated based on measurements by the laser aerovane and the second aerovane while referring to a windmill performance curve indicating output power characteristic of the wind power generator regarding wind velocity, to obtain a difference between the amounts of generated power; and an additional value calculation unit 400b that calculates additional value of an influence on the environment based on the difference between the amounts of generated power obtained by the calculation unit 400a.

Wind power generation evaluation system and prediction control service system for wind power generator

Method and apparatus for detecting conditions in the atmosphere which are hazardous to flying aircraft and providing early warning to pilots or ground personnel. The method includes using a laser beam and a coherent optical receiver to optically sense sound waves produced by those hazardous conditions and measuring the effect of those sound waves on the transmitted and received optical beams.

Method of detecting weather conditions in the atmosphere

A system for remotely measuring vertical and horizontal winds present in discrete volumes of air at selected locations above the ground. A laser beam is optically focused in range by a telescope, and the output beam is conically scanned at an angle θ about a vertical axis. The backscatter, or reflected light, from the ambient particulates in a volume of air, the focal volume, is detected for shifts in wavelength, and from these, horizontal and vertical wind components are computed.

/pdf/wind-measurement-system-56nuc0p2fy.pdf

Wind measurement system

A system for remotely measuring velocities present in discrete volumes of air in which a CO2 laser beam is focused by a telescope at such a volume, a focal volume, and within the focusable range, near field, of the telescope. The back scatter, or reflected light, principally from the focal volume, passes back through the telescope and is frequency compared with the original frequency of the laser, and the difference frequency or frequencies represent particle velocities in that focal volume.

/pdf/focused-laser-doppler-velocimeter-3bcp3advxr.pdf

Werner K. Dahm

Papers

Wind measurement system

Focused laser doppler velocimeter

A memoir: From peenemünde to USA: A classic case of technology transfer