Air flow measurement

[Roberto L. Landrau]

Peter> Below boost, the air flow rate was measure by an
Peter> ultrasonic flow meter which gave out a pulse train,
Peter> of a frequency proportional to the air velocity. The

From: "Matthew Lee Franklin" <fran0054 at gold.tc.umn.edu>
Matt> I had heard only of the hot wire or hot film made by
Matt> Hitachi and others.  If it really is ultrasonic I'd be
Matt> curious to hear who makes it and if there are any good
Matt> SAE papers on it.

The Chrysler Technical Reference Manual for the Eagle Talon
describes in detail how the system works.  In summary, the
sensor creates Karmann vortices (sp?) and an ultrasonic
sensor detects their presence.  The frequency of the sensor
pulses is used as an indication of air flow.

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Roberto L. Landrau	landrau at mitre.org