A new energy-efficient LED (light-emitting diode) fibre illumination technology for lighting up to 100m (328ft) of fibre-optic cables is being put through its paces at The Underwater Centre in Fort William.
Developed by St Andrews University spin-out firm PhotoSynergy, this technology is designed to enhance subsea diver, ROV (remotely operated vehicle) and tethered operations by offering a permanent light source for subsea navigation. The fibre illuminator cable is visible at depths of up to 150m (492ft), and has safety merits, too.
This happens to match the water depths readily available to The Underwater Centre, which is based on the shores of Loch Linnhe, where water depths plummet to 150m and are therefore deeper than most parts of the North Sea.
It has been developed as an energy-efficient alternative to traditional light sources and, says PhotoSynergy, can use as little as seven watts of power, so apparently making it one of the most energy-efficient fibre illuminators on the market.
With the control box remaining on the surface or housed in a diving bell or ROV, there is no actual power in the side-emitting fibre-optic cable. This means it can provide a safe, continuous and flexible light source for subsea divers.
The core product produces a green light, the colour proven to be nearest the peak eye response for optimal visibility in low light or darkness. Operating mode is switchable between steady illuminations or flashing on/off, the latter of which could be used as an emergency signal in the event of an incident.
This first industry trial of the technology at The Underwater Centre will involve the fibre-optic cable being attached to two diver umbilicals as they perform a diver rescue. Operating close to the centre’s private pier, at depths starting at 20m (65ft), the cable will undergo full trials and depth testing.
As part of the trial, two of The Underwater Centre’s ROVs will also be used – one to perform diver observation of the rescue and the other to monitor the ROV observing the divers.
Steve Ham, general manager of The Underwater Centre, said PhotoSynergy’s system had the potential to offer the subsea sector a valuable, but simple, solution to navigational problems, thereby increasing safety and operational efficiency.
“It’s an exciting trial for PhotoSynergy as the company will be able to determine the effectiveness of the technology at a range of depths and receive feedback from subsea divers as to the advantages of the technology.”
PhotoSynergy’s MD, Don Walker, said of the system: “The PSL-3000-M is the output of many years of work on laser-based systems and we are encouraged by initial discussions with manufacturers and users of umbilicals within the subsea industry.
“As with any innovation, it’s important to subject the technology to real-life trials, ensuring that it meets the challenges that are faced in the offshore environment.
“We chose The Underwater Centre because of its world-class facilities and the significant support on offer from the experienced subsea team at the centre – who, we are certain, will be able to make a valuable contribution to the production and further development of this new technology.”