science fair ideas

On 22 Feb 2007 08:25:17 -0800, twomblyfam@aol.com proclaimed to the
world:


Ultrasound is used for this. It may be possible to use  a cheap
ultrasound tape measure from Lowe's or Walmart. The sensor will have
to be touching the ice and have no air between it. Wetting it will
help. These units have a minimum distance they will measure in inches.
The unit would not read the ice thickness accurately because sound
travels at a different speed. I don't know for sure if it will be less
or more but the scale will just be off some. You can find the factor
to multiply by to get the real thickness.

Another possibility would be a stud finder sensor but the electronics
are not set up to measure distance or thickness.

Paul M wrote:

The speed of sound in ice is much higher than in air, so the minimum
distance will be larger. Bubbles in the ice may cause inaccuracy.

jerry
--
Engineering is the art of making what you want from things you can get.
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thank you for your response!
Mary

On Feb 23, 12:37 am, Paul M <PaulMatWiredogdotcom> wrote:

thank you so much for your repsonse!
Mary