Abstract
In this work we present the processing conditions and the characterization results of a time-of-flight (TOF) flow microsensor implemented using polysilicon microfilaments. Numerical simulation (ANSYS®/FLOTRAN®) and experimental results for analysis with air flow and nitrogen are compared considering different heater to sensor distances and flows. A good agreement was observed between experimental and simulated results. However, experimental TOF values resulted ever consistently higher than the simulated ones due to delays introduced by the circuitry and the data acquisition system and also in the thermal response of the microfilament. Analysis of the heater microfilament reveal that temperatures of the order of 100 °C (that is low enough to not affect the gas flow) can be obtained with a power dissipation of tens of mW. The time-of-flight measurements show that the proposed structure is suitable for the detection of low volumetric flows (tens of SCCM) and presents a response time of the order of milliseconds.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
