On Wed, 06 Apr 2005 10:24:58 -0700, Roy Lewallen
wrote:

Wes Stewart wrote:
On Wed, 06 Apr 2005 00:37:34 GMT, "
wrote:

That's interesting! That part regarding change of "density"
How does one determine the density changes in various parts of a radiation
pattern?


Jeeze. You use an rf densiometer of course.

An alternate method is to put some of the RF into a water-tight and
RF-tight box -- a great application for one of those ammo boxes left
over from survivalist exercises or just plinkin'. Drop the box into a
tub of water and see how much the water level rises. Then open the box
and let the RF out. (Be sure to wear safety glasses. A shielded cod
piece isn't a bad idea either.) Repeat the measurement. You can then
calculate the power density from the difference between the amounts the
water level rises.

A takeoff on this method would be to leave the rf in the box and
measure the temperature rise of the water. This eliminates the need
for the cod piece.

I'm really surprised that "The 'ole Metrologist", Richard Clark,
didn't already jump in with this.