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[Laser Institute of America ICALEO? 2015: 34th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing - Atlanta, Georgia, USA (October 18–22, 2015)] International Congress on Applications of Lasers & Electro-Optics - Rapid direct laser writing of microfluidic device on siloxane molds for microreplication
摘要： Microfluidic devices are usually made by replication with PDMS (polydimethylsiloxane) from masters produced using MEMS microfabrication technology. PDMS is the material of choice for pattern transfer due to its flexibility, chemical stability, and low surface energy. Creating functional microfluidic devices that integrate manipulation components (i.e., micro-filters or mixers) using MEMS technology is a costly and time consuming operation. This limits the ability to test design variants through agile, rapid prototyping of the device. Direct PDMS fabrication is an attractive alternative which require a direct writing technology. This work demonstrates direct structuring of PDMS with picoseconds pulsed laser, used for rapid creation of a mould for replication of the devices themselves. The main hindrance found in PDMS direct writing is the generation of decomposed layers which limits the further processing and compromises surface quality. The first results demonstrated that a microfluidic device with integrated functional microfeatures can be effectively fabricated without the formation of decomposed PDMS by carefully optimising the laser parameters and machining strategy. Complete 3x3mm microfluidic devices (with the integration of multistage filter components) were thus fabricated in under 2 minutes with lateral resolution down to 10μm. Hence, an optimized set of parameters allows fast rapid prototyping of microfluidic devices for development and proof of new concepts, using ultrafast lasers.
关键词： microfluidic devices,picoseconds pulsed laser,direct laser writing,rapid prototyping,PDMS
更新于2025-09-11 14:15:04
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Rapid Prototyping of a Micromotor with an Optical Rotary Encoder
摘要： This study proposed a rapid prototyping fabrication method for micromotors that allowed us to develop both 1 mm and 1.5 mm diameter permanent-magnet synchronous motors (PMSMs) with an optical rotary encoder. First, an integrated electroforming method was proposed for combining stator housing and flexible print circuit (FPC) coils to ease the manufacturing and assembly of micromotor components. This is particularly useful in the production of prototypes or small volumes of units. Second, an optical encoder was used to detect the rotational angle by means of a reflective code disk, an optical fiber, and a photo-detector. The micromotor was built with a code disk and an optical fiber. The code disk was designed to match the optical fiber and was made by photolithography and sputtering. Both the 1 mm and 1.5 mm diameter motors successfully achieved a rotational speed over 20,000 RPM and due to a 50 μm diameter optical fiber core, the encoders showed a resolution of 12 and 18 pulses per revolution (PPR), respectively.
关键词： micromotor,optical fiber,permanent-magnet synchronous motors,flexible print circuit,optical encoder,electroforming,rapid prototyping
更新于2025-09-10 09:29:36