Name: brian j billisitz
Status: N/A
Age: N/A
Location: N/A
Country: N/A
Date: Around 1993
Question:
I would like to know how to construct a underwater detection unit to catch
crabs using a pot or some other device.
Replies:
I am not sure that you want detection or trapping ability. If a trap has an
easy way in but no obvious way out and can allow the smell of bait to get
out, you will catch lots of crabs. Look up crab traps in fishing or other
books.
samuel p bowen
Hmmm...it might be neat to design a way that a crab fisherperson could tell
whether the bait had been taken and/or that a crab (or crabs) had been
trapped....some kind of signal or something. I think most commercial
fishers just put out all their pots, and then pull them all up and check
them. If there was some kind of cheap, reliable way to tell what the
"state" of the trap was without having to pull it up, it might save a lot of
toil and time.
But do I have any ideas? No....
rtopper
Radar does not work well underwater, because radio frequencies (the R in
RADAR) do not get very far before being absorbed. (Kind of like trying to
see through a wall, the light does not get very far.) There are many books
on sonar, try any library. There are other ways to detect things under
water depending on what it is you are trying to detect. For a submarine,
they can detect the iron by its effect on a magnetic. If it is something
big, you can also look for a wake if it is moving.
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