lamp air flow sensor

bitrex · 2019-03-29T18:04:28+00:00

I saw a kinda clever schematic for a crude air flow sensor using an incandescent lamp and a constant current source, with some associated analog electronics to measure associated changes in the filament temperature wrt airflow velocity. Problem is that the lamp needs to be cracked open and the thin filament exposed directly to the air for this trick to work. pretty fragile and impractical for high velocity air. Maybe use a very small (intact) lamp like grain-o-wheat and look at the envelope temperature in the infrared. like with a wireless mouse IR camera or IR photodiode

Mar 29, 2019 42 Replies

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George Herold 7 years ago

Huh OK.. this found searching for hot wire mic.

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(Resonator used as band pass filter) George H.

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rangerssuck 7 years ago

Ambient air temperature is rendered insignificant to the measurement by heating the filament enough (several hundred degrees) that a few tens of degrees fluctuation in ambient makes little difference in the measurement. Google "hot wire anemometer."

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Paul Hovnanian P.E. 7 years ago

Google 'Mass Air Flow Sensor'. Hot wire type is very common in automobiles.

-- Paul Hovnanian mailto: snipped-for-privacy@Hovnanian.com

------------------------------------------------------------------ I could get a new lease on life but I need the first and last month in advance.

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