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Re: It looks like what?

October 27, 2022 12:00PM
Sorry for the late reply, been on the road. I think the "V" shaped detection pattern arose because it was an easy way to verbally describe the pattern. The real pattern looks a bit more like one of the Coneheads from SNL. Here is the V pattern compared to a more realistic pattern:



I measured that pattern many years ago and can't remember what detector I used but it would have been a concentric. Also, it bulges out around the edges of the coil, which is not shown. Although a V pattern isn't a totally unfair approximation it does underestimate overlap efficiency. Here is a 50% overlap of a realistic field:



This creates a full ground coverage at 75% of max depth whereas a V pattern suggests you will only get 50% of max depth. So even with a 50% overlap you will often miss the deepest targets; in fact, below that 75% full-coverage depth you will, on average, miss about half the targets. That's why places are never completely hunted out.

Different coils will have slightly different detection patterns, especially DD. They tend to have a narrower pattern side-to-side but the front-to-back pattern is very similar to a concentric do the overlap requirement is about the same.
Subject Author Views Posted

When is it beneficial to Overlap Coil Sweeps?

UtahRich 330 October 20, 2022 11:38AM

How do you walk in a straight line?

GB_Amateur 201 October 22, 2022 10:15AM

GB_Amateur, your addition to this topic fits well.

Monte 187 October 22, 2022 02:18PM

Thanks, Monte

GB_Amateur 232 October 23, 2022 09:57AM

Great questions, Rich. thinkingconfused smiley

Monte 508 October 21, 2022 01:33PM

Re: When is it less productive to overlap coin sweeps?

Sodbuster 186 October 21, 2022 09:36AM

Re: When is it beneficial to Overlap Coil Sweeps?

jmaryt 465 October 20, 2022 06:10PM

j.t., just a brief comment about a 'detection field'.

Monte 171 October 21, 2022 12:21PM

Re: j.t., just a brief comment about a 'detection field'.

jmaryt 204 October 21, 2022 07:02PM

j.t., I agree about the 50% overlap coverage.

Monte 177 October 22, 2022 04:45AM

Re: j.t., I agree about the 50% overlap coverage.

jmaryt 182 October 22, 2022 07:54PM

hmmm . . . . .

UtahRich 194 October 21, 2022 08:41PM

Re: hmmm . . . . .

jmaryt 199 October 22, 2022 08:01PM

It looks like what?

UtahRich 229 October 22, 2022 09:46PM

Re: It looks like what?

Geotech 205 October 27, 2022 12:00PM

Re: It looks like what?

GB_Amateur 176 October 28, 2022 09:52AM

Re: It looks like what?

Geotech 169 October 29, 2022 01:54PM

Re: It looks like what?

GB_Amateur 189 October 30, 2022 09:38AM

Experimenting with your own equipment

UtahRich 192 October 28, 2022 10:42AM

Re: Experimenting with your own equipment

nwdetectorist 170 October 31, 2022 08:49PM

Rich, there is another way to deal with cell phone EMI.

Monte 208 October 29, 2022 10:43AM

Re: Rich, there is another way to deal with cell phone EMI.

jmaryt 165 October 29, 2022 07:20PM

Re: Experimenting with your own equipment

GB_Amateur 175 October 29, 2022 09:46AM

Re: Experimenting with your own equipment

Monte 189 October 29, 2022 10:52AM

Great response.

UtahRich 202 October 27, 2022 04:12PM

Re: It looks like what?

FeistyFrank 185 October 27, 2022 02:44PM

Re: It looks like what?

Geotech 186 October 28, 2022 10:15AM

Thank You, Carl.. Appreciated by many. N/T

Monte 145 October 29, 2022 10:54AM

Re: It looks like what?

FeistyFrank 170 October 28, 2022 11:10AM

Re: It looks like what?

jmaryt 172 October 23, 2022 07:52PM

Descriptions can be confusing. confused smiley

Monte 182 October 24, 2022 12:57PM

Re: Descriptions can be confusing. confused smiley

jmaryt 186 October 24, 2022 06:03PM

j.t., as UtahRich said ... No worries.

Monte 227 October 25, 2022 05:21AM

Re: j.t., as UtahRich said ... No worries.

jmaryt 272 October 25, 2022 05:07PM

Re: Descriptions can be confusing. confused smiley

UtahRich 189 October 24, 2022 07:54PM

Re: Descriptions can be confusing. confused smiley

jmaryt 193 October 25, 2022 05:13PM

Sunrise . . . . sunset . . . .

UtahRich 185 October 26, 2022 01:12AM

Re: Sunrise . . . . sunset . . . .

jmaryt 169 October 26, 2022 06:20PM

Or is that Snow Fal .... Snow Melt ....

Monte 167 October 26, 2022 01:29PM

A better description?

UtahRich 189 October 23, 2022 09:05PM

Rich, I am looking for Carl's post. N/T

Monte 195 October 23, 2022 07:09PM

Yes, the topic can create some interesting discussions.

Monte 189 October 22, 2022 02:35PM



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