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Posted by B1ackwater on January 10, 2006, 7:27 am
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On Mon, 9 Jan 2006 18:27:04 -0500, "Mitch Berkson"
>Larry wrote:
>>
>> Please check out PSR-1 at www.eutectos.com. and let me know what you
>> think.
>>
>> As in most Sonars, there is a dead zone, which in this case (gain and
>> pulse width dependent) can be as low as 8 inches. Current
>> implementation provides 1" resolution, which could be reduced to
>> perhaps 1/4 inch. Hardware supports it, but firmware would need to be
>> changed. Can you tell me more about your requirement both technically,
>> application wise and what the potential volume may be? We might be
>> able to help, and would like too.
>
>From the title and his original post, isn't it clear that he wants a
>WEATHERPROOF sensor? Yours isn't and neither are other offerings in the
><$100 price range. I think there would be many people thrilled to know
>about a WEATHERPROOF distance sensor for less than $100. For starters, this
>would mean that it would work when wet.
Let's just say my project needs to visit drainpipes ...
Anyway, I wasn't expecting SUB-$100 weatherproof ultrasonics, but
$149.99 would have been bearable. Are you aware of anyone who has
put an ultrasonic behind a very thin rubber/plastic membrane and
got it to halfway work ? If it had a lot of xmit power ...
>Also, the Devantech or the new (see other thread) MaxSonar-EZ1 are about
>half the price of the PSR-1. Is there an advantage of yours over those
>offerings?
I think his offer an 'echogram' in addition to a simple
distance measurement - so faster offboard hardware can
do fancy stuff with the signal. Might be interesting,
especially if you used a binocular sensor arrangement
and some way to scan the beams around. A low-rez 3-d
'image' with exact distance easily availible ... but
you'd need to be better than me with the math because
it would be kinda like processing an MRI or CAT scan.
An echogram would also be cool for a robot sub - if
the sensor could be seriously waterproofed that is ...
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> cost, size and flexibility. Putting the sensor in a plastic or metal
> box that fits your specific platform is the best bet. Put a couple of
> o-rings around the transducer and mount the sensor through a close
> fitting hole in the box. Then ...
>
> Have you tried putting a latex finger-cott over the sensor head? The
> thin membrane will be acoustically transparent. One way I've used to
> protect the transducers is as follows:
> 1) partially inflate a balloon. 2) apply a thin film of super-glue,
> silicone RTV or epoxy around the side of the transducer. 3) press the
> balloon against the face of the transducer so that the balloon deforms
> over the sides of the transducer. 4) hold until adhesive cures. 5) cut
> away excess balloon material.
>
> Stay dry,
>
> Larry
>