Feeds

US Navy uncloaks stealthy underwater solar cells

Energy capture up to nine meters down

Secure remote control for conventional and virtual desktops

Scientists at the US Navy Research Laboratory (NRL) are developing solar cells that can work effectively up to nine meters underwater, powering marine systems for long periods of time.

Big data is not just for the boardroom, but for the battlefield as well, and military planners are working on using a lot more stealthy sensors and systems that need power without carrying batteries or sticking a solar panel out of the water. But light isn't very effective at penetrating seawater, and conventional solar cells that rely on silicon aren't very good at catching what little light that does.

"The use of autonomous systems to provide situational awareness and long-term environment monitoring underwater is increasing," said Phillip Jenkins, head of NRL Imagers and Detectors section, in a statement. "Although water absorbs sunlight, the technical challenge is to develop a solar cell that can efficiently convert these underwater photons to electricity."

While the amount of light penetrating seawater falls off rapidly with depth, what little that does get down is in a fairly narrow spectral band. The scientists focused on this area using gallium indium phosphide (GaInP) solar cells, similar to those used by satellites, which are highly efficient in visible-light wavelengths, and perform far better than run-of-the-mill photovoltaics in the blue/green portion of the spectrum predominant in seawater.

US Navy solar cell performance underwater

New cells focus on what little light you can get in the vasty deep

The team now estimates that a square meter of these cells would generate 7W of power at 9.1 meters of depth, with better performance – of course – at shallower depths. The team suggests they'd be most effective in coastal regions on low-power applications to replace monitoring stations using fixed power lines. ®

Secure remote control for conventional and virtual desktops

More from The Register

next story
SCREW YOU, Russia! NASA lobs $6.8bn at Boeing AND SpaceX to run space station taxis
Musk charging nearly half as much as Boeing for crew trips
Boffins say they've got Lithium batteries the wrong way around
Surprises at the nano-scale mean our ideas about how they charge could be all wrong
Thought that last dinosaur was BIG? This one's bloody ENORMOUS
Weighed several adult elephants, contend boffins
Europe prepares to INVADE comet: Rosetta landing site chosen
No word yet on whether backup site is labelled 'K'
India's MOM Mars mission makes final course correction
Mangalyaan probe will feel the burn of orbital insertion on September 24th
Cracked it - Vulture 2 power podule fires servos for 4 HOURS
Pixhawk avionics juice issue sorted, onwards to Spaceport America
City hidden beneath England's Stonehenge had HUMAN ABATTOIR. And a pub
Boozed-up ancients drank beer before tearing corpses apart
'Duck face' selfie in SPAAAACE: Rosetta's snap with bird comet
Probe prepares to make first landing on fast-moving rock
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
Saudi Petroleum chooses Tegile storage solution
A storage solution that addresses company growth and performance for business-critical applications of caseware archive and search along with other key operational systems.
Security and trust: The backbone of doing business over the internet
Explores the current state of website security and the contributions Symantec is making to help organizations protect critical data and build trust with customers.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.