[time-nuts] Anybody have suggestions for time related science fair projects?
jimlux at earthlink.net
Sun May 13 09:29:31 EDT 2018
On 5/12/18 5:01 PM, Adrian Godwin wrote:
> How about a demonstration of how GPS works, substituting sound waves for
> radio ?
> Maybe three sound sources with harmonically-related frequencies, then
> measure their phase difference on an oscilloscope.
> Cheat a bit : you don't need to do cdma acquisition. Have one reference at
> a low frequency, switch two more on alternately at a higher frequency.
> Measure the phase difference between one pair at a time and calculate your
> location relative to the stationary sources.
In science fairs that are judged, the rubric really demands something
that can be cast into the classic "literature search, hypothesis,
experiment, data reduction, conclusion" form. Even straight up
engineering is sometimes knocked down - the International Fair (being
held this week, as it happens) does have separate rubric for engineering
So what you want to do is cast this as an experiment or engineering
project. For the latter: "Performance characterization of acoustic
For a more "sciencey" approach, you'd postulate some theory/hypothesis:
"air temperature measurement can be used to compensate for speed of
sound variation in acoustic multilateration"
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