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Void Scanner laser surveying system

Renishaw's Void Scanner is the most reliable, cost-effective way to carry out the regular mapping of underground voids, stopes, shafts and ore passes.

The cavity monitoring system of choice for many mine owners looking for durable, robust mapping devices

Void Scanner is a specialist, boom-deployable underground laser scanner, specifically designed to work in unsafe or difficult-to-access areas, while giving you all the data you need to feed into your existing mine maps, so that complete, up-to-date mapping is possible.

Plan new projects

The Renishaw Void Scanner is an innovative cavity monitoring system for on-the-spot, underground mine surveys, which can be used to support project planning and daily operational decision-making.

Practical and easy to use, the Void Scanner cavity monitoring system provides 3D laser scans of subterranean voids, stopes, tunnels and shafts, and is built specifically to operate in conditions found in underground mines.

Improve efficiency

  • Large areas can be surveyed quickly by one or two operators, who need only minimal training to start using the system.
  • 3D data can be used to improve installation times on projects and verify the accuracy of an installation against design.
  • Fast end-of-shift scans give an accurate record of productivity.
  • Comparison of extracted volume calculations with waste and ore stockpile volume helps evaluate operational efficiency.
  • Scan tunnels, stopes, stockpiles and silos with just one system.

Get greater confidence in your data

By giving you more confidence in the data used to plan new programmes of extraction, and in the data used to evaluate the volume of extraction, Void Scanner makes the complex and time-consuming process of operational planning and improvement, simpler and easier to achieve.

Since 2008, underground mines have used Void Scanner to plan new, profitable projects safely and efficiently. The product also enables mine operators to complete regular checks for auditing and safety-management purposes.

Improve safety

  • Flexible deployment methods enable you to quickly scan inaccessible voids, from a position of safety.
  • Ensure future operations are safe, by using detailed models of underground voids when planning projects.
  • Assess the efficiency of ventilation networks by running Void Scanner as-built models through computational fluid dynamics (CFD) packages.

Expand your mine planning capabilities

  • Animation: Void Scanner

    Learn how to map underground voids safely and quickly, using thousands of data points to create 3D models, which can be used to plan mitigation works.

Designed for results

Void Scanner deployed on boom

The Void Scanner cavity monitoring system produces detailed scans of entire voids, with a range of up to 150 m.

Scanned data can be easily and quickly exported into all major mine packages for integration and comparison with existing data.

Void Scanner is an ideal choice when accuracy matters, since it offers:

  • 270° vertical and 360° horizontal field of view
  • pitch-and-roll sensor with 360° capability
  • typical accuracies of + / - 5 cm
  • range resolution of 1 cm
  • range of up to 150 m (on 90% reflectivity)
  • scanning speed of 200 points per second

How it works

Void Scanner is designed to give accurate data, using the latest 3D mapping technology, in the unique conditions found in underground mines.

Laser scanning

Point cloud scan of a void

Laser scanning is a quick, modern, and highly accurate surveying method, requiring little operator training.

3D laser scanning captures spatial data using laser light. The laser in the Void Scanner probe sends out pulses of infrared light, which bounce off solid surfaces and are then received back into the Void Scanner and recorded as a point in space.

The shape, position, and spatial locations of objects are recorded by millions of points, each with XYZ co-ordinates. The full set of points, or point cloud, represents the space or object scanned.

Our Cavity Profiler software allows for modelling and manipulation of the point cloud data, as well as export to other packages.


Quick setup and scan time

Void Scanner is used underground

Void Scanner scans quicker than other surveying tools. With a 200 points per second scan rate, a series of full 360° scans taken at 1° increments and giving a full point cloud map of a cavity, will take around 12 minutes. Void Scanner offers a 360˚ horizontal scan and a vertical scan extent of 270˚.

Setup is quick and simple, essential for those customers using Void Scanner for daily void volume calculations. Ten minutes is sufficient to unpack the system, connect cables, mount to the boom, and ready the laptop.

The Void Scanner is powered by either a 12 V dc battery, or by mains power. A battery and an ac power adaptor are included in the package, or operators can use a 12 V car battery or equivalent power source. 

Locating the void relative to other maps

Manual: Void Scanner: Prism location 2

To plan new projects, it is helpful to know the absolute position of any voids, so that the point cloud data collected using Void Scanner can be used alongside other mine maps.

Void Scanner makes it easy to do this, for mines with local survey control points and a total station. Our training gives even those with no experience of surveying the confidence and skills they need to complete the simple process involved. Alternatively, our own project team can undertake the work for you, at the beginning of a project.

A 360° prism, provided with the system, screws onto a mount on top of the Void Scanner. A total station can be used to shoot in the position of this prism in relation to local survey control points.

Once the position of the Void Scanner is established through observations to the attached prism, one more co-ordinate referencing the back end of the boom allows the software to calculate the orientation of the boom, and the system itself.

Multiple Void Scanner scans can be joined to each other or to datasets collected by other means once the co-ordinate reference points are known.

Designed for deep underground mines

Underground mine with tracks and lighting

Underground mining has ventured ever deeper in recent years, and so Void Scanner is designed to withstand the higher operating temperatures found deep underground. It is also robust and portable enough to be used for multiple deployments. Many of our units have been in operation for over six years.

The lightweight and portable Void Scanner weighs 5 kg and, with a diameter of just 15 cm, can be deployed into small apertures. Where much narrower borehole deployment is required, we recommend our slimline C-ALS system. 

Versatile deployment

C-ALS training in a mine in Chile

Void Scanner's flexible deployment options give customers the opportunity to reach previously innaccessible or dangerous voids, safely and quickly.

Void Scanner's mounting points allow for tripod, boom, mast, crane or wire line deployment. The system also has built-in digital 3-axis pitch-and-roll sensors to automatically correct for the instrument's inclination, whether deployed in a vertical or horizontal orientation.

Data output and control (from tablet PCs or PDAs) is via a 13 m power/data cable. A WiFi option is available and can be used, for example, when the instrument is deployed from robotic, unmanned mining machinery.


  • Brochure: Void Scanner 150 (VS150) Mk3 Brochure: Void Scanner 150 (VS150) Mk3

    Void Scanner is a 3D laser scanner, which gives mine managers and others working with underground constructions the opportunity to gather data safely and at a low cost to help support safe operations, new project planning and the reconciliation of underground workings and ore stockpiles.

  • Data sheet: Void Scanner 150 (VS150) Mk3 Data sheet: Void Scanner 150 (VS150) Mk3

    Void Scanner is an innovative system for on-the-spot, underground mine surveys, which can be used to support project planning and daily operational decision-making.

  • Manual: Void Scanner Manual: Void Scanner

    This hardware manual describes the Void Scanner probe and all accessories supplied with a standard system. Section 7.2 gives a brief overview of a typical deployment. Some troubleshooting tips are also offered in Section 8.

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