Re: 8051 and sonar (depth finder)
From: MetalHead (WanderingMetalHead_at_HATESPAM.yahoo.com)
Date: 12/30/04
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Date: Thu, 30 Dec 2004 03:33:20 GMT
Joerg wrote:
> Hi Joop,
>
>> The last boat I was on had a depth meter with some rotating device
>> inside. Probably a rotating mirror. The round scale showed various
>> echos at different depths of which the 'real one' was usually of
>> maximum light output.
>>
>>
>
> That was a real classic. I believe it is a little neon bulb on a
> rotating disk. Echoes are amplified and the bulb hangs on the output of
> the amp. I vaguely remember that Heathkit offered on of these. But I
> didn't have a boat...
>
> Regards, Joerg
>
> http://www.analogconsultants.com
The Neon light and rotating disk was a pretty nice solution to the
problem in simple digital depth sounders of which echo do you call the
bottom? With the disk rotating at a constant speed, it would "time" the
echoes for you and show all of them.
Years ago I built a similar system for scuba diving, but it used a set
of counters selecting LED's out of a matrix, with the detections,
illuminating the selected LED. I started testing this thing in a pool
and found that the pool surfaces were so reflective that the entire pool
(olympic size) saturated with sound. I put a scope on the receiver and
it showed continuous output. First I thought that the receiver was
oscillating, so I took another transducer to the far end of the pool and
the amplitude on the second transducer showed the same continuous
signal. The amplitude change from the transmit pulses was not visible at
all. The same piece of equipment worked fine in a local quarry.
Bob
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