Jackie Chan Discs Help Boost Solar Panel Efficiency

wbr1 writes Apparently the pit pattern on a blu-ray disk is great at helping trap photons, rather than reflecting them. Applying this pattern to the glass in a solar panel can boost efficiency by 22%. Researchers at Northwestern tested this system with Jackie Chan discs. From the article: "To increase the efficiency of a solar panel by 22%, the researchers at Northwestern bought a copy of Police Story 3: Supercop on Blu-ray; removed the top plastic layer, exposing the recording medium beneath; cast a mold of the quasi-random pattern; and then used the mold to create a photovoltaic cell with the same pattern....The end result is a solar panel that has a quantum efficiency of around 40% — up about 22% from the non-patterned solar panel."

Comments

Copyright?

[BronsCon]

Cue copyright infringement suit in 3..2..1...

Re:Copyright?

[Frnknstn]

Dunno about the solar efficiency, but it sure does make the picture quality better. And it makes my CDs sound so much warmer!

Re:Copyright?

[BronsCon]

I don't know... I can replace the batteries in my $5 calculator every year, or I can have a solar cell in my $5 calculator and never replace the batteries, because there aren't any. That's just one practical application where they're quite economical; there are many others, but I'm not up to the task of wasting my time doing your research for you, so you can seek them out yourself if you're interested.

old joke is old

[Anonymous Coward]

Imagine what it could be with a Chuck Norris movie!!!

Re:old joke is old

[meglon]

You know why there's not a Bruce Lee meme like there is for Chuck Norris? Bruce Lee isn't a joke.

Re:old joke is old

[Anonymous Coward]

Charles Nelson Reilly have Chuck Norris' head mounted on a wall.

Chuck Norris has Chuck Norris' head mounted on his shoulders.

Re:when dirty?

[blackomegax]

The data density in bluray means that the pits are far, far, far, far too small for dirt to get stuck in, or on. Think of it like placing a pebble on a beach. There are pits between sand grains but the size disparity means it acts like a flat surface for most intents and purposes.

BLUE ray

[Spy Handler]

The pits on a blu ray disc are optimized for reading with a blue laser. Sun's output have more energy at the other end (red spectrum). I'm thinking they might get even better efficiency if they tried a disc pitting pattern that was meant for reading with a red laser.

Re:BLUE ray

[pavon]

Now that they have a proof of concept, it is an obvious thing for researchers to try different pit sizes and patterns in order to optimize the efficiency

Actually, that already happened. As the abstract of the paper notes, previous research has already identified how to theoretically optimize patterns, but arbitrary patterns require expensive photo lithography equipment to create. This research shows that an existing inexpensive mass production technique generates results that are almost as good as the optimized patterns, but not quite as good because the spacing of the pits is a bit too periodic (especially across tracks rather than along them).

Re:BLUE ray

[lgw]

Replacing your roof with solar panels will always be an overhead cost!

Re:when dirty?

[wbr1]

The data density in bluray means that the pits are far, far, far, far too small for dirt to get stuck in, or on. Think of it like placing a pebble on a beach. There are pits between sand grains but the size disparity means it acts like a flat surface for most intents and purposes.

Not only this, but presumably the pits can be under the glass, just as they are under polycarbonate on a disc. Then the pits are not exposed to dir, and a normal washing will remove surface dust, bird poop, etc.

The First Attempt

[MarkRose]

I heard the first attempt was with Chuck Norris discs, but they burnt holes through the panels.

Electricity vs. oil

[crow]

Electricity and oil are both energy. You can substitute one for the other, though obviously there's advantages for certain forms in certain uses.

For home heating, oil, natural gas, and electricity are all viable depending on the cost. Right now gas is the cheapest and electricity is, in most places, the most expensive. It would take a lot of progress to get electricity to be the most economic solution for heating.

For aircraft, the weight of batteries rules them out.

For cars, Tesla is proving that electricity is an option. I know that we just signed a contract for solar panels on our house to produce more than we currently use on the assumption that we'll need the extra production to power our next car.

Re:Mass produce!

[spiritplumber]

I've had a solar bike for about six months, and it works fine for my needs (mostly grocery shopping and laundry). Now that it's winter, I have to occasionally charge it. It cost about $350 to put together.

Re:Mass produce!

[spiritplumber]

Here's the picture: http://f3.to/quickgal/14049339...

Room for further research....

[pollarda]

If they can do this with SuperCop, just imagine what sort of efficencies they could get by using an AC/DC album! Also by using AC/DC as the base pattern it might allow them to create native AC and skip the use of a DC->AC power inverter.

Re:Room for further research....

[mjwx]

If they can do this with SuperCop, just imagine what sort of efficencies they could get by using an AC/DC album! Also by using AC/DC as the base pattern it might allow them to create native AC and skip the use of a DC->AC power inverter.

AC/DC is bad, the last thing you want is for your solar panels to be... THUNDERSTRUCK.

Further on Li, Chan, Norris, etc.

[fyngyrz]

Sorry, didn't quite mean to submit there.

TKD is a very specialized sport art. Very limited engagement rules and a complete lack of tools for dealing with anything but an upright, sparring style opponent relegate it to at best a functional niche limited to kicking (which any well rounded martial artist can convert into a different engagement, ground for instance) in the course of which instantly defanging most of the TKD stylists tools. TL;DR, TKD is more of a sport than a martial art. I should know; I'm dan-ranked in it within the context of the Korean taekwondo jidokwan, one of the earlier kwans that preceded the establishment of the WTF and ITF collaboration / standardizations.

Chan's martial arts background spans several styles (Shaolin gongfu, taekwondo, and hapkido), and consequently is broadly based with ground, standup, upright grappling, locking, striking, blocking, kicking, footwork and defensive components. He is by *any* sane measure a much more well rounded martial artist than Norris (and if you just admire kicking skill, I'm surprised you didn't bring up Bill "superfoot" Wallace.)

Li started training at age 8. He won his first national championship at age 11 -- remember we're talking about China here -- he traveled to more than 45 countries as a member of the Beijing wushu team. He held the title of All-Around National Wushu Champion from 1974 to 1979. He trained in internal and external styles, as well as the (then) required shíba ban bingqi (eighteen arms or weapons.)

(Please excuse the mangled pinyin; I don't use pinyin much, preferring actual hanzi, and traditional hanzi at that. (hanja for you TKD folks.) But slashdot doesn't support them (why? some geek site, lol)

Further, he practices wushu, which looks cool but is not a very effective martial art.

Wushu means "martial art." It doesn't tell you squat about martial art effectiveness, other than that the practitioner, like a "martial artist" in the US, practices some martial art or arts. You should have a look right here so next time you use the term wushu in the context of a Chinese martial artist, you actually know what you're saying. Although, technically speaking, just like gongfu (doesn't really mean martial art at all), the term carries implications you might not initially grasp; for instance, to a Chinese, a Korean TKD master is both a gongfu and a wushu master, plain and simple. Which again demonstrates that wushu doesn't mean anything even close to what you thought it meant.

However, your previous statement is worse in that it amounts to a blanket dismissal of all of China's martial arts, which is nothing short of ludicrous. Combined with your bewilderment of both Chan and Li's training backgrounds, your credibility is somewhere south of zero on this matter.