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Hi psubbers,
Today I got my hydrophone ! - so my first action
was to rush to the harbor, get into the submarine and sail her surfaced out into
the main basin of Copenhagen harbor. I plugged in my new Dolphinear
Hydrophone System together and lowered it down from the deck of the
submarine.
In the earphones I hear noise - loud noise. Its
sounds mostly like static on a radio with no antennae - I try to adjust
gain assuming that the amplifier is just very good and that its amplifying
the background noise of the sea...hmm...then a big motorship comes nearer -
and passes me at distance of about 20 meters. Regardless of orientation, depth
and gain - there is no way that I can detect a big motor at 20 meters range.
Just the same static noise. I disconnect the hydrophone to clear is this is
an amplifier problem - and the noise almost disappears - I reconnect NOISE-
and pull the hydrophone back up - and above water the noise is a little
different.
Hm...conclusion...the device can possible detect if
its submerged or not - the noise origins from the sensor - but is not correlated
to anything outside the sensor - tapping on it will be heard as a change in
the noise pattern...so something does work.
My example has no use in detecting anything like a
ship - it could not detect my own boats propeller or engine.
If this is the last word in
hydrophones...then I prefer to be deaf.
Best regards,
Peter Jeg beskyttes af den gratis SPAMfighter til privatbrugere. Den har indtil videre sparet mig for at få 14284 spam-mails Betalende brugere får ikke denne besked i deres e-mails. Hent en gratis SPAMfighter her. |