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- W2905065172 abstract "The effect of membrane deflection has been investigated for thermal flow sensors. Catastrophic membrane breakage is a common occurrence in membrane based thermal flow sensors due to thermal expansion and internal stresses. This work analyses three sensors comprising a tungsten heater embedded in buried oxide membrane with a silicon nitride passivation layer, the use of back etching creates a cavity underneath to reduce the thermal conduction. The investigation is done using interferometry to measure the membrane shape at room and operating temperature for three membranes of different sizes. As expected, the deflection increases with temperature up to 15 µm at operating temperature and with the reduction of membrane size the deflection is reduced to a minimum of 3 µm for the smallest membrane. The lower deflection measured in devices with a smaller cavity can be related to a reduced internal stress, improving the long term stability." @default.
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- W2905065172 date "2018-12-11" @default.
- W2905065172 modified "2023-09-26" @default.
- W2905065172 title "Membrane Deflection and Stress in Thermal Flow Sensors" @default.
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- W2905065172 doi "https://doi.org/10.3390/proceedings2131089" @default.
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