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RIEGL LMS-Q680i - 8 Pages

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RIEGL LMS-Q680i

Catalog excerpts

Long-Range Airborne Laser Scanner for Full Waveform Analysis ■ full waveform analysis for unlimited number of target echoes ■ multiple-time-around processing high laser pulse repetition rate up to 400 kHz 1 up to 266 000 measurements/sec on the ground ■ high ranging accuracy up to 20 mm ■ high scan speed up to 200 lines/sec • wide scan field of view up to 60° ■ parallel scan lines ■ interface for smooth integration of GPS The new RIEGL® LMS-Q680i long-range airborne laser scanner makes use of a powerful laser source, multiple-time-around (MTA) processing, and digital full waveform analysis. This combination allows the operation at varying flight altitudes and is therefore ideally suited for aerial survey of complex terrain. The RIEGL LMS-Q680i gives access to detailed target parameters by digitizing the echo signal online during data acquisition, and subsequent off-line waveform analysis. This method is especially valuable when dealing with difficult tasks, such as canopy height investigation or target classification. Multiple-time-around processing allows the utilization of target echo signals which have been detected out of the unambiguity range between two successive laser pulses. In post-processing the correct allocation of ambiguous echo ranges is accomplished by using RiANALYZE in combination with the associated algorithm library RiMTA. The operational parameters of the RIEGL LMS-Q680i can be configured to cover a wide field of applications. Comprehensive interface features support smooth integration of the instrument into a complete airborne scanning system. The instrument makes use of the time-of-flight distance measurement principle of infrared nanosecond pulses. Fast opto-mechanical beam scanning provides absolutely linear, unidirectional and parallel scan lines. The instrument is extremely rugged, therefore ideally suited for the installation on aircraft. Also, it is compact and lightweight enough to be installed in small twin- or single-engine planes, helicopters or UAVs. The instrument needs only one power supply and GPS timing signals to provide online monitoring data while logging the precisely time-stamped and digitized echo signal data to the rugged RIEGL Data Recorder. : LASER MEASUREMENT SYSTEMS Topography & Mining Corridor Mapping City Modeling Mapping of Lakesides & River Banks Agriculture & Forestry Target Classification Glacier & Snowfield Mapping Power Lines visit our website www.riegl.com ®

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Laser Product Classification    Class 3R Laser Product according to IEC60825-1:2007 The following clause applies for instruments delivered into the UnitedStates: Complieswith 21 CFR 1040.10 and 1040.11 except for deviations pursuant to Laser Notice No. 50, dated June 24, 2007. Safe for the naked eye Safe for the aided eye I INVISIBLE LASER RADIATION AVOID DIRECT EYE EXPOSURE CLASS 3R LASER PRODUCT HMAX.AVERAGE OUTPUT <40 mW PULSE DURATIONAPPROX. 3 ns WAVELENGTH    1550 nm Range Measurement Performance as a function of PRR and target reflectivity Laser Pulse Repetition Rate Max. Measurement...

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Echo Signal of the RIEGL LMS-Q680i The digitization feature of the RIEGL LMS-Q680i enables the user to extract most comprehensive information from the echo signals. Figure 1 illustrates a measurement situation where 3 laser measurements are taken on different types of targets. The red pulses symbolize the laser signals travelling towards the target with the speed of light. When the signal interacts with the diffusely reflecting target surface, a fraction of the transmitted signal is reflected towards the laser instrument, indicated by the blue signals. In situation 1, the laser pulse hits...

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Multiple-time-around Data Acquisition and Processing In time-of-flight laser ranging a maximum unambiguous measurement range exists which is defined by the measurement repetition rate and the speed of light. When scanning at a pulse repetition rate of, e.g., 400 kHz, measurement ranges above approx. 375 m are ambiguous caused by an effect known as “Multiple-timearound” (MTA). In such case target echoes received may not be associated with their preceding laser pulses emitted any longer (MTAzone 1), but have to be associated with their last but one (MTA-zone 2), or even last but two laser...

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PRR = 400 kHz PRR = 400 kHz @ visibility 23 km @ visibility 15 km @ visibility 8 km Maximum Measurement Range fm!    Maximum Measurement Range [m] Target Reflectivity [%] MTA3 MTA2 MTA1 The following conditions are assumed: for the Operating Flight Altitude AGL • ambiguity resolved by multiple-time-around (MTA) processing & flight planning • target size > laser footprint • scan angle 60° • average ambient brightness • roll angle +/-5° Flight Altitude AGL swath width Example: Q680i at 400,000 pulses/second Altitude = 1300ft AGL, Speed = 80 kn Resulting Point Density ~ 16 pts/m2 swath width...

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PRR = 200 kHz Maximum Measurement Range fm!    Maximum Measurement Range [m] Target Reflectivity [%] Flight Altitude AGL swath width Example: Q680i at 200,000 pulses/second Altitude = 2600ft AGL, Speed = 80 kn Resulting Point Density ~ 4 pts/m2 Flight @ 60 Altitude ^Fov swath width The following conditions are assumed: for the Operating Flight Altitude AGL • ambiguity resolved by multiple-time-around (MTA) processing & flight planning • target size > laser footprint • scan angle 60° • average ambient brightness • roll angle +/-5° Example: Q680i at 80,000 pulses/second Altitude = 3600ft AGL,...

 Open the catalog to page 6

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