Hi all,
A parabolic dish to be used for ultrasonic purposes uses the same
physics as a parabolic dish used in a flash light or in microwave
applications. I dabble in the microwave arena. The engineering is the
same. A dish has an f/D ratio that is the where f is the focal point
dimension and D is the diameter. The feed beam width chosen to be used
for a dish has to be matched to the f/D to get optimal performance. I
suspect that the ultrasonic sensor has a wide beam width and so is best
matched to a deep dish. A deep dish has a low f/D radio such as f/D = .3
or so.
A few years ago I was driving through town and saw the traffic light
people changing out the light bulbs for LED traffic lights. Yup those
were deep dish parabolic units being scrapped and I got a bunch. They
work well to 24 GHz. The point here is you may find a suitable parabolic
dish in unusual places. Have fun looking!
Don, N0YE
On 1/1/2013 8:49 PM, rick darwicki wrote:
I'm considering building the W1TRC arc detector from April 2006 QST.
Any ideas on a cheap source for the parabolic dish?
Worth the effort?
Thanks
Rick, N6PE
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