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Multibeam Sonar with Integrated Laser Scanner and Sound Velocity Probe

The Secret of the Depth

When building bridges and waterways, we need to know what’s under the water. Using our multibeam sonar and integrated laser scanner, we perform high-precision pre- and post-surveys, producing a 360-degree view of the bed and surface conditions of project sites in a single step.

The system consists of a multibeam sonar (for bottom surveys), an integrated laser scanner (iLidar for surface mapping) and a sound velocity probe. The survey is based on the sound wave reflected from the bottom and objects on the bottom.

The system can be used to measure the bed of any natural or artificial water, even in turbid waters. It is particularly important in construction and dredging work, as well as in the recovery of sunken floating equipment and wrecks. During diving operations, it helps to ensure safer diving, especially in poor visibility conditions. It can be used to accurately determine current conditions, analyse objects on the bottom and objects of unknown origin down to the smallest detail.

With multibeam sonar and an integrated laser scanner, we get a perfect picture of the underwater and above-water conditions, allowing us to estimate the cost of each job more accurately, optimise the process and avoid disputes by carrying out follow-up surveys.

History

In all our construction work, we always need an accurate knowledge of the conditions of the riverbed. We have therefore decided that within the framework of a support scheme, we will apply for the purchase of this equipment with the aim of technological modernisation and efficiency improvement. In 2021, we were awarded the grant, so we use the system partly for our own work and partly to provide a complete geodetic service to our clients.

During the renovation of the Chain Bridge, we used the multibeam system to map the wrecks of the bridge that was blown up during World War II. Later, we excavated the wreckage. We also provided details of the riverbed survey for the design and construction of the Robinson footbridge and the Danube bridge between Paks and Kalocsa. Currently, we are the only company in the country to have such a system.

Technical data

The system can capture 512 signals in 1 second by emitting 1 pulse. The signals are converted into data by crystals. The system collects and processes the data, and uses software to give photo-like results of the size, distance and shape of the reflective objects, accurate to centimetres.

Staff requirements

Instrument assembly, graphical software setup, calibration, measurement and evaluation are all carried out by our trained professionals. At the end of the process, a survey report is drawn up. One survey boat is required for the sonar recordings.