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Offline willy bayot
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« Reply #10 on: September 04, 2009, 12:19:42 am »
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Quote:Posted by findoldstuff
Hi Eugene, Christian, Salvor and others,
Christian - back on another post I think you stated that you were working on a couple of Willy's kits- if I am correct, have you completed it and have any results?
Christian will answer himself to this question but you could get reports of many practical survey results from some of our other clients using the PPM right now in the field.Willy's design is PPM and is more sensitive than the fluxgate- am I correct?
YES, ours is a PPM with a sensitivity 20 times the one of any Fluxgate system based on the FatQuarters Sensors.

Salvor, the Fat Quarters design is fluxgate, am I correct? I am asking these questions to make certian I have everything correct in my researching-there is so much out there it can get confusing fast. Now is there a portable unit that can also be used as a base unit that you can simply change the sensor and go from land to marine without having two complete units? And be affordable.
Yes, our PPM-MarkII system can accept a land-type sensor (it is shipped with one of them) and a marine sensor could easily be built by integrating our sensor coils inside a fish container.
I think our system is quite affordable.

Thanks ahead for keeping me straight
FOS


Willy

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Offline stephanemg
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« Reply #11 on: September 04, 2009, 12:42:57 am »
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does the ppm could be used with two sensors as a gradiometer ?

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Offline willy bayot
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« Reply #12 on: September 04, 2009, 02:46:01 am »
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We prefer to use a differential configuration using a fixed station and a mobile station, both being synchronized in time. The difference between the corresponding measurements gives the field gradients where the diurnal field variations are removed.
This configuration is lighter to carry since there is only a single sensor and a smaller battery on the mobile station, the others being fixed on the static station.

Willy

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« Reply #13 on: September 04, 2009, 02:43:28 pm »
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thanks willy.
But this increase the price of what's needed to buy, to have gradiometer measurements.
Phil barnes, already managed to have a simple gradiometer version of ppm, maybe it would be an interesting option to add the possibility to have a second sensor on your device in future versions no ?


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Offline willy bayot
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« Reply #14 on: September 05, 2009, 01:06:07 am »
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Hi,

The only 'slight' difference is that the system of Phil Barnes does not work. Cry
Did you already find another PPM kit reported to be successful in the field by real users?
I can tell you that this design decison in our PPM-MarkII system was taken with much reasoning and weighting.
It depends what you mean by 'increased price'. This is still a small percentage of the price of a commercial PPM system.
Also, if your potential targets are real iron or steel targets, you do not need any gradiometer, a single sensor works very well if the targets generate field gradients more than 2 or 3 nT which are the range of values usually generated by the diurnal field variations.

Willy

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Offline findoldstuff
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« Reply #15 on: September 05, 2009, 09:23:25 am »
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Hello Willy
What would be the smallest target your design will detect and what depth on land? Also I need to find a 6' x 8' rudder with a 9' shaft in water, what would be the deepest that I could detect this with your recommended towfish sensor design with your unit?
Thanks FindOldStuff

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Offline willy bayot
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« Reply #16 on: September 05, 2009, 11:11:09 am »
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Hi,

The answer to this question is complex as the sensitivity of a PPM depends on the mass of the magnetic material and the distance to it. Look at the nomograph attached, it shows what field gradients in Gamma (nT) are generated by what mass at what distance.
Our PPM is able to detect field gradients of around 1nT. So, you just defien your specs and look at this graph to see if it generates at least one or more nT's.

On our web site (

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www.ppm-markii.net/index.htm
), you will find a number of benchmark test results with real targets made by one of our clients. This will give you a practical idea of what this PPM is able to do in the field.

What is the approximate weight of that target you search?

Willy

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Offline findoldstuff
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« Reply #17 on: September 05, 2009, 03:21:06 pm »
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Hello Willy
The shaft and rudder combine are @ 2,700 lbs.

FindOldStuff

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Offline willy bayot
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« Reply #18 on: September 06, 2009, 12:54:29 am »
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This target should be detectable at around 15meters. It is more than the mass of a car and I know for sure that cars start to disturb my ground readings at 20 meters if parked too close.
Look at the nomogram, it is about right there.

Willy

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« Last Edit: September 06, 2009, 12:57:02 am by willy bayot »
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« Reply #19 on: March 01, 2018, 08:35:50 pm »
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Quote:Posted by willy bayot
Hi Eugene52,

Add this one to your list:

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www.ppm-markii.net/index.htm


It is one of the few PPM kit systems which is proven to be really working (no scam!!).
Being a PPM, it is also much more sensitive than any fluxgate system based on the Fat Quarters (i.e. Speake & Co) sensors.

Willy


This is a very old thread but does anyone know of any PPM kits?

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