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Sembra siano allo studio candele laser in grado di focalizzare fino a tre punti differenti in modo di avere differenti punti di accensione.



<< BBC >> (http://www.bbc.co.uk/news/science-environment-13160950)

Car engines could soon be fired by lasers instead of spark plugs, researchers say.

A team at the Conference on Lasers and Electro-Optics will report on 1 May that they have designed lasers that could ignite the fuel/air mixture in combustion engines.
The approach would increase efficiency of engines, and reduce their pollution, by igniting more of the mixture.
The team is in discussions with a spark plug manufacturer.
The idea of replacing spark plugs - a technology that has changed little since their invention 150 years ago - with lasers is not a new one.
Spark plugs only ignite the fuel mixture near the spark gap, reducing the combustion efficiency, and the metal that makes them up is slowly eroded as they age.
But only with the advent of smaller lasers has the idea of laser-based combustion become a practical one.
A team from Romania and Japan has now demonstrated a system that can focus two or three laser beams into an engine's cylinders at variable depths.
That increases the completeness of combustion and neatly avoids the issue of degradation with time.
However, it requires that lasers of high pulse energies are used; just as with spark plugs, a great deal of energy is needed to cause ignition of the fuel.
"In the past, lasers that could meet those requirements were limited to basic research because they were big, inefficient, and unstable," said Takunori Taira of the National Institutes of Natural Sciences in Okazaki, Japan.
Spark plug Spark plugs only ignite the fuel mixture very near the spark gap
"Nor could they be located away from the engine, because their powerful beams would destroy any optical fibres that delivered light to the cylinders."
The team has been developing a new approach to the problem: lasers made of ceramic powders that are pressed into spark-plug sized cylinders.
These ceramic devices are lasers in their own right, gathering energy from compact, lower-power lasers that are sent in via optical fibre and releasing it in pulses just 800 trillionths of a second long.
Unlike the delicate crystals typically used in high-power lasers, the ceramics are more robust and can better handle the heat within combustion engines.
The team is in discussions to commercialise the technology with Denso, a major automobile component manufacturer.

"Nonno, ho la macchina che va a tre cilindri, aiutami che guardo se la candela fa scintilla............. "

ZOOT !!

"Minchia ! Nonno, rispondimi !! Cos'e' quel buco in fronte ? ? ?"  ??? :o :o ;D

Perche' devi essere sempre pessimista, magari gli ritorna la vista al nonno! :P ;D

magari puoi operarti alle cornee in garage semplicemente girando la chiave di accensione

;D ;D ;D ;D ;D ;D ;D ;D ;D

quando in un prossimo futuro l'auto non andrà più in moto non la si porterà più dal meccanico od in assistenza presso la casa madre , si andrà su coruscant  al tempio dei jedi e li il maestro joda dopo una lunga concentrazione escamerà " PRONZA USA LA FORZA ! " e l'auto emettendo un whammmmmmmmmmmmmm si rimetterà in moto .

ahahahah...lo "ZOOT" ha sempre il suo fascino...noi lo usiamo molto a Elettrotecnica e TDP ;D

direi  che il problema principale è il costo

devono essere di costo paragonabile alle candele che in fase di produzione costano circa 1 euro