Sensitivity Enhancement of Tube-Integrated MEMS Flow Sensor Using Flexible Copper on Polyimide Substrate.

Area of Science:

• MEMS technology
• Sensor design
• Fluid dynamics

Background:

• Conventional flow sensors often have limitations in sensitivity and integration.
• Existing sensor placements on inner tube walls may not capture peak flow velocities effectively.

Purpose of the Study:

• To propose a novel tube-integrated flow sensor design.
• To enhance flow sensing sensitivity and simplify fabrication.
• To optimize sensor placement within the airflow region.

Main Methods:

• Integration of a micro-electro mechanical systems (MEMS) flow-sensing element and electrical wiring on a copper on polyimide (COP) substrate.
• Rolling the substrate into a circular tube, defining the airflow region.
• Implementing slits to position the sensing element at the tube's center for maximum flow velocity detection.

Main Results:

• The fabricated sensor is integrated directly into a tube structure.
• Signal lines are simultaneously formed and connected, simplifying electrical connections.
• The tube-integrated sensor achieved double the sensitivity compared to conventional designs placed on the inner wall.

Conclusions:

• The proposed tube-integrated MEMS flow sensor offers a simplified fabrication process and enhanced performance.
• Optimized sensor placement at the center of the tube significantly increases sensitivity.
• This design represents a promising advancement in flow sensing technology for various applications.