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Renishaw subsidiary Measurement Devices, a designer and manufacturer of high-speed laser measurement and surveying systems, has used its compact and lightweight Dynascan 3D mobile mapping system to scan a section of the Cliffs of Moher in Ireland.

Coastway, which specialises in chartered land surveying and geospatial engineering, was approached in April 2012 to assist in contributing towards an Environmental Impact Statement for the future development of a specific area on the Cliffs of Moher, which are located on the western seaboard of County Clare.

The brief was to prepare a 3D model and high-definition video from the resultant point cloud data of a 2km section of the cliffs. As the cliff face is only accessible and visible by boat, the biggest challenge for this project was how to laser-scan from a moving platform and how to achieve sufficient resolution, coverage and accuracy from a place of safety.

After considering the options, Coastway contacted Measurement Devices, which proposed a solution using the Dynascan 3D mobile mapping system that can be used to capture 3D light detection and ranging (LIDAR) data. The system could be mounted to a fishing boat to capture the data required to produce a 3D model and video.

Key benefits of product application

  • The small size and compact nature of the Dynascan system meant it could be quickly mobilised during a limited weather window and easily mounted on a vessel of opportunity.
  • An M500 mapping grade system and a secondary GPS antenna were mounted on a boom at the front of the fishing boat, allowing a sufficient field of view for the 360º scanning laser module to survey the cliff.
  • The Dynascan system contains a high-grade inertial measurement unit consisting of gyroscopes and accelerometers that works to compensate for the motion, pitch and roll of the boat.
  • Accurate 3D positioning was achieved using the built-in real-time kinematic differential GNSS systems, which employ GNSS carrier-phase differential techniques to provide real-time, centimetre-level, three-dimensional positioning.
  • The actual survey data took less than hour to acquire; on completion of the vessel survey, the system was transferred onto a vehicle and used to capture the topography on the top of the cliff. The data was collected on the same grid, allowing for seamless integration between the two data sets.
  • The entire equipment mobilisation, data acquisition on the vessel and vehicle, demobilisation and data download was completed successfully within a single day.

Renishaw

A world leader in engineering technologies, Renishaw’s core skills in measurement and precision machining serve sectors as diverse as dimensional metrology, spectroscopy, machine calibration, motion control, dentistry and surgical robotics.

A world leader in engineering technologies, Renishaw’s core skills in measurement and precision machining serve sectors as diverse as dimensional metrology, spectroscopy, machine calibration, motion control, dentistry and surgical robotics.

Sensors for co-ordinate measuring machines (CMMs) are an industry standard, from basic touch-trigger probes through to automated stylus and probe changers, motorised indexing probe heads, and revolutionary five-axis measurement systems.

Machine probes for CNC machine tools allow automated tool setting, workpiece set-up, in-cycle gauging and part inspection. Products include laser tool setters, contact tool setters, tool breakage detectors, touch probes and high accuracy inspection probes.

For motion control, Renishaw supplies laser encoders, optical linear encoders, optical angle encoders, optical rotary encoders, magnetic rotary encoders, magnetic chip encoders and magnetic linear encoders.

To analyse the static and dynamic performance of position-critical motion systems, Renishaw’s laser interferometer and environmental compensation system offers a linear measurement accuracy of 0.5 ppm, readings of up to 50 kHz and a linear measurement speed of up to 4 m/s, with a linear resolution of 1nm.

Renishaw’s Raman spectroscopy products exploit the Raman effect to identify and characterise the chemistry and structure of materials. A diverse range of analytical applications include pharmaceutical, forensic science, nanotechnology, biomedical and semiconductors.

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