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Offline Cornelius
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« Reply #10 on: February 16, 2009, 05:01:35 pm »
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Will your coil pick up metal through a sheet of PVC ? I think so . So the metal in the neighbourhood of the coil will spoil the detecting result .   Cornelius No no!

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Offline Datasteve
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« Reply #11 on: February 16, 2009, 05:35:08 pm »
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I don't think the security camera Im thinking about putting in the tube has any substantial metel in it except for the little bits in the circuit.

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Offline Cornelius
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« Reply #12 on: February 16, 2009, 05:42:17 pm »
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Datasteve . You just do it the way you think it should be done . I just pointed out a few things to you . We will discuss this after you tried it your way . Success with your ROV . They can come in handy .   Cornelius

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Offline Eugene52
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« Reply #13 on: February 16, 2009, 06:15:11 pm »
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Quote:Posted by Datasteve
The camera and everything else will be mounted inside a PVC tube that is enclosed and water tight the detector coil would be mounted outside but the wire would probally be run back inside the tube to join all the other wires going up to the control box.


Hello Datasteve. The camera and the Metal Detectors circuit board and its housing , can be mounted right on the ROV . The search-coil must be mounted 2 feet away "minimum" from the ROV'S metal , if it is a VLF Detector with discrimination . Or it must be at least 3 feet away "minimum" if it is pulse induction with a standard 10 inch p.i. mono coil . Please increase the distance if you use a bigger P.I. search coil . And yes , you can power and control all functions at 35 to 50 feet away if you use the proper type of coax cables . You should have no problems completing your project  Great.....................Best Regards................Eugene52


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« Reply #14 on: February 17, 2009, 03:34:42 pm »
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Thanks Eugene I never thought of coax i was going to shrink wrap indivual wires but coax makes a lot more sense.
Steve

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« Reply #15 on: March 13, 2009, 09:06:49 am »
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Thanks ...........Eugene52


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« Reply #16 on: March 13, 2009, 11:25:26 am »
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Hello galaksi , and Welcome to Thunting.com . It seems you have some experience and knowledge with Metal Detectors , so we are looking forward to reading all of your new posts !!

Thank-You for joining and Best Regards..................Eugene52

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« Reply #17 on: May 11, 2009, 01:03:19 pm »
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Hi,
      There was a video on an ROV metal detector recently. However it raised more questions than it answered. If I were doing it I would mount the search coil on a short boom in front of the ROV. The next decision is which principle are you going to use for the detector, I'll stick my neck out here and say it is going to be a VLF phase angle detector using a double D search head at right angles to the direction of movement. A coil arrangement with a 12" overlap will give you a forward swept path of about 12" wide. I see no reason why this cannot be increased to 36" .... however,  all that will tell you is that the detected target is somewhere along that line. To precisely locate the object the coil must then be turned through 90 degrees and another sweep done in the same position (ROV stationary) to find the intersect. You now know within an inch the exact location of the target and probably also whether it is ferrous or non-ferrous .... the question is .... what now ?. Do you let the ROV dig for the coin ... or simply mark the ground spot with a paint spray and allow a human to do the extraction ?.

The above would work OK on nice flat ground .... but not on a furrowed field .... it would first have to be ploughed and rolled, otherwise your search coil would be bouncing all over the place. The other question is whether you would be better off with an autonomous ROV which could be left to get on with the job without human supervision. One problem being that domestic GPS is no where near accurate enough to lead a human back to the exact location of a find or even let the ROV know exactly where it was. There are solutions .... but it gets complicated  :) .... I can continue if you wish .....


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« Reply #18 on: May 11, 2009, 03:29:31 pm »
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The basic Idea behind mounting a metal detector to my ROV was to use it almost like side scan sonar. The thinking was the areas where I got good signals I could drop a Bouy then come back and dive on them with a underwater machine and decide rather to dig or not.

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« Reply #19 on: May 11, 2009, 04:04:51 pm »
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Ah ....underwater !. Here I would go for a PI system, no discrimination .  Green lasers can assist in setting up the search grid  underwater, but it is probably just as quick to set up a search grid manually, with tape etc. The ferrous metal fittings of a wreck are a good indication of how it happened and where  heavier cargoes may have  ended up

I think I would go for a magnetometer survey, over a fairly large area before I dragged out the airlifts !.

jk

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