Renishaw
Renishaw C-ALS Cavity Scanner
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C-ALS®, Renishaw's unique laser scanner is not only changing the way underground surveying is done, it has begun to change the way mining operations are carried out, making previously dangerous tasks operable in complete safety. 

Renishaw's newest C-ALS® has twice the measurement rate of the original unit and three times the angle scan rate, enabling surveys of underground cavities to be carried out more quickly than ever before, saving time, money and reducing exposure of the probe to danger. The system dramatically improves the safety, security and planning of mines and helps to align their activities with that of the safety authorities by providing timely and accurate information for decision making. The  C-ALS® enables users to reduce the risk of underground surveying by deploying a C-ALS® 3D laser scanner from safe locations into broken ground and dangerous ‘void' areas. 

With a diameter of just 50 mm the compact probe can be deployed through boreholes in order to survey inaccessible spaces. Red LEDs provide illumination for the onboard nose cone camera, permitting a view of the borehole and any obstructions encountered as well as the opening into the void. Once into the void, the laser head opens out to measure the three-dimensional shape of the void and its surface reflectivity. 

The  C-ALS® can withstand being submerged under water to a depth of 1 m, reducing the risk of damage in the event the unit is deployed into a flooded cavity. The motorised head has a 360° field of view enabling the user to gain 3D images of the void, with ranges of 150 m and 300 m. The C-ALS® probe incorporates pitch, roll sensors and has the option of an internal compass. These sensors ensure accurate orientation and positioning of the scanned point cloud. A system of hinged lightweight 1 m rods provide a fixed azimuth capability and enables easy deployment down hole, up hole or horizontally. 

A load-bearing cable attached to the probe transmits all measured data back to the surface control unit and a ruggedized computer is used for set up, control and data acquisition. Renishaw's control software provides an on-screen video from the C-ALS® camera and a real-time 3D view of the void as it is scanned." 

Benefits

  • Survey inaccessible voids safely
  • Deploy in long narrow boreholes
  • Scan voids in minutes not hours
  • 360° spherical coverage with no blind spots
  • Nosecone camera to assist deployment
  • Orientation sensors ensure scan is automatically geo-referenced to fit into existing 3D mine data
  • Integrated Pitch and roll sensors 

Applications

  • Ore pass erosion monitoring
  • Stope surveying
  • Void investigation
  • Mine rescue
  • Abandoned mine surveying
  • Bridge internal void surveys
  • Nuclear facilities
  • Industrial production facilities
  • Bunker surveys
  • Subsidence investigations
  • Tunnel surveys 

The motorised 2-axis scanning head ensures a complete 360° scan covering the entire void up to a range of 300 m/ 960'. The C-ALS probe incorporates pitch and roll sensors and has the option of an internal compass. These sensors ensure accurate orientation and positioning of the scanned point cloud. A system of hinged lightweight 1m rods provide a fixed azimuth and enables easy deployment down hole, up hole or horizontally. 

A load-bearing cable attached to the probe transmits all measured data back to the surface control unit. A ruggedised computer is used for set up, control and data acquisition. Renishaw's control software provides an in-screen video from the C-ALS camera and a real- time 3D view of the void as it is scanned.

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