Re: IMAQ application; measuring gas volume

[Brian Beal]

There probably isn't a cheap way to do this.  Even short stroke LVDTs
are expensive, and they are spring loaded, so I would be concerned
about them affecting your measurements.  Depending on how familiar you
are with IMAQ, that may be the way to go.  You would have to do a
calibration routine to get accurate measurements, and measure between
2 points.  One would be fixed, and the other would be the piston or
the column of mercury.  Don't try to just measure a position on the
screen.