Metek Meteorologische Messtechnik Gmbh

Metek Meterologische Messtechnik Gmbh

Metek Gmbh

Gerhard Peters

Ernst Brinkmeyer

Bernd Fischer

Christoph Bollig

A LIDAR measuring device and a method for determining the speed of particles in a measuring volume includes a narrowband continuous wave laser light source (), which emits light which is coupled into a measuring branch () and a reference branch (). The light coupled into the measuring branch () is at least partially emitted by a transmitting device in the direction of the measuring volume such that the emitted light is at least partially scattered and/or reflected by the particles in the measuring volume. A part of the scattered and/or reflected light is then received by a receiver device and is coherently superimposed with the light leaving the reference branch (), and the resulting light beam is directed onto a detector () to generate a detector signal characteristic for the resulting light beam. Finally, the speed of the particles in the measuring volume is determined in an evaluation unit () by taking into account the detector signal.

LIDAR measuring device

An ultrasonic anemometer () as well as a method for determination of at least one component of a wind velocity vector and/or a velocity of sound includes at least one sound transducer at least temporarily working as a transmitter () with a sound emission surface for emitting sound waves and at least one sound transducer at least temporarily working as a receiver () with a sound detection surface for at least partially receiving the emitted sound waves. An evaluation unit, determines at least one component of a wind velocity vector and/or the velocity of sound, based on a recorded transit time, which the sound waves require on a measuring section located between the sound emission surface of the at least one transmittor and the sound detection surface of the at least one receiver to cover the distance of this measuring section. At least one measuring section is provided between a first sound emission surface of a first transmitter and a first sound detection surface of a first receiver arranged approximately vertical to the earth's surface and the first sound emission surface and/or the first sound detection surface is inclined compared to the horizontal.

Ultrasonic anemometer and method for determination of at least one component of a wind velocity vector or the velocity of sound in the atmosphere

Described is a device as well as a method for measuring a change in distance between a stationary initial point and an object, wherein frequency-modulated, continuous electromagnetic microwaves are emitted as an emitting signal () in the direction of the object such that the emitting signal () is reflected by the object and an echo signal () generated at the object following the reflection of the emitting signal () is received and evaluated. The method described or the FMCW radar apparatus designed according to the invention, respectively, is based on a hardware extension of a standard FMCW radar apparatus and offers the possibility of evaluating a time-independent part of the mixed signal phase () by means of evaluation electronics () while taking into account a propagation time of the emitting () and/or echo signal () between emitting unit () and object so that a change in distance between emitting unit () and object can be detected as a result of a change in propagation time.

Method and device for measuring a change in distance

A method for determination of precipitation types in the atmosphere is described, wherein an output signal, in particular a radar signal, having a transmitting frequency spectrum is transmitted, reflection signals formed by reflection of the output signals at precipitation particles at at least two atmospheric levels and having a reflection spectrum are detected, and wherein finally the characteristics of the reflection signals are analyzed. The method according to the invention is characterized in that on analyzing characteristics of the reflection signals a course of a difference frequency spectrum formed by transmission frequency and reflection frequency spectrum is analyzed resolved by altitude levels.

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Hamburg, Germany

Gerhard Peters