Shock Sensor Question

[Bernd Felsche]

Steve.Flanagan at VerizonWireless.com tapped away at the keyboard with:

> Don't know how you can record Digital pictures into an analog data
> recorder.

Computer is digital. I wasn't aware of your limitation of an
analogue data recorder. If the camera is digital, use IEEE1394
connection for lossless, digital transfer. You measure the
displacement on-screen on a field-by-field basis.

> I have a multi channel 0-4V analog data recorder,  and am looking
> for a cheap way to monitor the position of my shocks on the launch
> and also down track.

> The expensive way is to use the $180-$200 dollar linear position
> sensors, I am just looking for a cheaper way.  The budget wont
> allow for that expense when the money is needed else where on the
> car.

Rotary encoders are somewhat cheaper, depending on enclosures and
resolution.

Cost really depends on if you already have a camcorder.

> Thanks though.
> 
> BW???   The recorder can sample from 1 Hz to 1000 Hz max.

What's the frequency of the thing you're trying to measure? 
Normal (road) suspension dampers cannot respond to frequencies much
beyond 100Hz. The suspension relies instead on tyre flexure.


> -----Original Message-----
> From: Bernd Felsche [mailto:bernie at innovative.iinet.net.au]

> Steve.Flanagan at VerizonWireless.com tapped away at the keyboard with:
> 
> > Application is to monitor the shocks on our 1/4 mile car.  This
> > way I can determine if I need an adjustment based on how the car
> > is launching and driving down track.
> 
> > We can adjust both compression and extension of the shock, so it
> > would be nice to see how the adjustments actually effect
> > performance.  Tuning the start line reaction of a chassis is
> > critical to maximizing the performance.
> 
> Consider a high-speed camera. Even a low-end camcorder delivers 50
> or 60 fields per second (depending on video system). Plug the signal
> into a computer (digital camcorder makes that easy) and measure the
> displacement over time, from field to field.
> 
> What sort of bandwidth and displacement do you think you'll be
> measuring?

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