I want to make a alcohol breath analyzer, how can one measure the air speed
when blowing trough the analyzer's tube?

 

-          I could do it with a small encoder and a propeller (I don't know
for sure if that's the English word.)

-          I can do it with a Pitot tube, but I think its intended for 0.3
Match and above speeds. it that correct? 

-          The Venturi tube its intended for non compressible fluids

-          What about a couple of ultrasonic transducers and measuring the
propagation delay?

-          Hot wire? .. Nahhh.

 

Any other suggestion? Best approaches?

 

Regards,

 

Mauricio Jancic

Janso Desarrollos

Microchip Consultant Program Member

info@janso.com.ar

www.janso.com.ar

+54 11 4542 3519

 

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