<div dir="ltr">On Tue, Aug 19, 2008 at 11:09 AM, Cédric Berger <span dir="ltr"><<a href="mailto:cedric.berger74@gmail.com">cedric.berger74@gmail.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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</div>I would think main problem is microphone sensitivity/speaker strength.<br>
Hard to get over noise.<br>
But I am curious to know to what point this could work !<br>
<div></div></blockquote><div><br>Uncertainty in the measurement would be an issue, but to what degree I do not know. I think this could at least be accurate enough to adequately measure the length of a couch while shopping.<br>
</div></div><br>The Vernier device [1] is pretty accurate:<br>SPECIFICATIONS
<br>- ultrasound frequency: 50 kHz
<br>- resolution: 1 mm
<br>- accuracy: 2 mm
<br>- range: MD-BTD - 0.15 m to 6 m
<br> MDO-BTD - 0.5 m to 6 m
<br>- speed of ultrasound used to calculate distance: 343 m/s
<br>- power: 51 mA while running
<br><br>-Charles Edward Pax<br><br>[1] <a href="http://www.vernier.com/til/1374.html">http://www.vernier.com/til/1374.html</a><br></div>