Daimler Chrysler Ag

Messerschmitt-bolkow-blohm Gmbh

Messerschmitt-boelkow-blohm Gmbh

Messerschmitt-bogmbh

Sigmund Manhart

Thorsteinn Halldorsson

Ernst-August Seiffarth

Peter Dyrna

Bernd Kunkel

Elke Schmidt

John Langerholc

A velocity such as wind velocity is measured based on a Doppler shift of a backscattered or returned laser signal. The Doppler shift of the backscattered beam is determined from a change in the polarization state or intensity shift of the received or backscattered signal after it has passed through a polarization-dispersive element (PD) and through a polarization analyzer (PA). The electrical signals (I,and I,) generated from two partial beams provided by the polarization analyzer (PA) represent an the intensity shift. The signals are processed in a computer and the resulting information is displayed, for example.

Method and apparatus for determining a velocity

A detector device for detecting and indicating the origin of laser radiation is disclosed. The detector has a plurality of discrete optics, with the discrete optics being arranged in azimuth planes. Each discrete optics monitors a preset solid angle with significant overlap between the angles. Each discrete optics has a first and second wave guide. The first wave guides are coupled to a first opto-electric transducer and the second wave guide is coupled to a second opto-electric transducer. The transducers are respectively coupled to a first and a second detector stage. All first wave guides leading to the first detector stage are of equal length while the second wave guides are of incrementally increasing length in the direction of increasing azimuth angle. The incrementally increasing length causes increasing travel time for light pulses over the wave guides. A transit time measuring device is coupled to the first and second detector stage and determines the beginning and end of the transit time measurement and, as a function of its, the solid angle of the incident laser radiation. Additionally, the opto-electric transducers of the first and second detector stages are coupled with a resonant circuit which acts as a filter stage. The resonant period of the resonant circuit is at least four times larger than the duration of the build-up time of the arriving laser pulse. The damped resonant circuits of the first and second detector stages are respectively coupled to passage-through-the-zero-axis detectors. The first time the incoming signal triggers one of the zero-axis detectors a starting signal is sent to the transit time measuring circuit and the next time one of the zero-axis detectors is triggered a stopping signal is sent to the measuring circuit.

Radiation position detection using time-indicative variable-length fiber

A radar ranging system uses a laser transmitter and a single detector for producing the start and stop signals for the time interval measurement. Two reference signals are produced by passing two light portions, decoupled from the laser light to be transmitted to a target, through two different delay lines to the detector. The time difference between the first reference signal and a target signal is a measure for the range to be measured. The time difference between the two reference signals is used as a calibration measure for repeatedly calibrating the system. The true range is calculated by forming the ratio of the two time intervals.

Ranging method and apparatus

A method and system is used for detecting the presence of measuring the distance to and producing an image of, objects which, while being strongly absorbing or reflecting themselves, are hid from sight in a medium which is strongly dampening due to light dispersion, such as submersed submarines. The method provides, in addition to detecting the reflection from the surface of the object, a full acquisition of the variation of the backscatter of scanning laser pulses by the medium surrounding the object, with laser pulse transmitters operating with a much larger pulse duration, being usable for this purpose.

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Haar, Germany

Sigmund Manhart