jump to navigation

How golf ball deformed after hitting a steel plate at 240 km/h May 24, 2010

Posted by viboon in : Science and engineering , add a comment


Tags: , , , ,

Related posts:

Microfabrication of Origami May 20, 2010

Posted by viboon in : Uncategorized , add a comment

See.. how is interesting of microfabrication.

By Mui-Ling Teh
http://www.redbubble.com/people/m48teh


Tags: ,

Related posts:

La Campanella May 9, 2010

Posted by viboon in : Uncategorized , add a comment

La Campanella by Yundi Li


Tags: , ,

Related posts:

Femtosecond-pulsed laser for microfabrication process May 8, 2010

Posted by viboon in : Manufacturing technologies , add a comment

Due to the enormous peak power in the range of MW and the moderate average power, femtosecond-pulsed laser is an effective tool for fabricating parts in micro and submicro levels. By focusing the light down to focal spot in the micrometer range, the ultrafast laser is turned into a high precision tool. When applied to various materials this results in remarkably clean ablation properties due to the ionization and vaporization of the material quickly before thermal effects such as heat diffusion can occur. Even delicate materials can be processed. Further, the high pulse repetition rates of tens or hundreds of MHz support fast processing speed and uninterrupted operation. Tool deterioration and reproducibility is not an issue, since light is not getting blunt. However, real world industrial applications of femtosecond lasers are at the very beginning. At present nanosecond and picosecond lasers with repetition rates in the kHz range are the first choice for applications like molding, cutting or marking.

The femtosecond lasers can be an excellent alternative for some of the applications is shown in the lithography system “Photonic Professional”. Based on direct laser writing it offers a new level in precise manufacturing of 3D nano- and microstructures.

The direct laser writing process makes use of laser pulses with energy below the absorption threshold of the photosensitive material. The illuminated material is transparent for the light. Only by focusing the ultrashort light pulses to a small focal spot, multi photon absorption processes in a very localized volume can be triggered. Hence, a chemical modification of this area can be occurred by baking process and subsequently leads to a local polymerization. The process allows engineering almost arbitrary 3-dimensional structures out of various photosensitive materials such as SU-8, Ormocere, PDMS, and chalcogenide glasses. Furthermore, these 3D structures can act as templates for replication (positive – positive) or inversion (positive – negative) processes into other materials like e.g. silica, and silicon. The laser lithography system routinely achieves 150 nm linewidth in a sample volume of 300x300x80 µm. Main applications include the engineering of 3D photonic crystal structures, and the generation of 3D scaffolds for biology, micro- and nanofluidic circuitry.

Ref: http://www.menlosystems.com/home/applications/micromachining.html


Tags: , ,

Related posts:

Calling Windows applications from Matlab May 8, 2010

Posted by viboon in : Matlab, MS Windows , add a comment
1
!mspaint

or

1
system('mspaint')

Tags: ,

Related posts: