Magnetometer kit

		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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http://www.thunting.com/smf/index.php/topic,3049.msg47924.html#msg47924

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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http://www.thunting.com/smf/index.php/topic,3049.msg47936.html#msg47936

Hi,

The only 'slight' difference is that the system of Phil Barnes does not work.
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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http://www.thunting.com/smf/index.php/topic,3049.msg48112.html#msg48112

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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http://www.thunting.com/smf/index.php/topic,3049.msg48144.html#msg48144

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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http://www.thunting.com/smf/index.php/topic,3049.msg48245.html#msg48245