Blacksand detector ? (titanomagnetite)

[jasonNZ]

Does anyone know of a detector that can handle blacksand beach (titanomagnetite) ?

Some guys say that tarsacci mdt 8000 works with a special coil designed just for blacksand (which i doubt), another person has mentioned vallon vmh3cs , the only evidence i have seen on video so far is the new Fisher AQ.

[Skippy]

The Fisher Impulse AQ sounds like it has been tested on volcanic black sand, particularly the beaches of Reunion Island, a French territory.

Two discussion forums wher the Tarsacci and the Impulse get some chat, are Dankowski Detectors, and DetectorProspector.

[kt315]

yes, Eric did his detector on titanomagnetite sands on the beaches. we had read his report.

[Ferric Toes]

yes, Eric did his detector on titanomagnetite sands on the beaches. we had read his report.

Not in this instance. The beach where this picture was taken is very neutral and gave no magnetic response. The detector is a Vallon VMH3CS which has an effective mineral mode for working iron mineralised ground. The white search coil is one of my specials.

Black sand can be one of two things which give different responses. The sand can consist of magnetite grains which give little or no signal on a PI detector, but deflects the field from the coil with the result that the penetration and depth range suffer. Or it can contain smaller maghemite grains which result in a response somewhat similar to metal. Volcanic basalts and sand that is derived from them have this characteristic. Ground balancing is then required and there is also some loss in range due to field deflection. Titanomagnetite sand is somewhat lighter in colour than the previous two and likely needs ground balancing facilities.

Eric.

[dbanner]

Not in this instance. The beach where this picture was taken is very neutral and gave no magnetic response. The detector is a Vallon VMH3CS which has an effective mineral mode for working iron mineralised ground. The white search coil is one of my specials.

Black sand can be one of two things which give different responses. The sand can consist of magnetite grains which give little or no signal on a PI detector, but deflects the field from the coil with the result that the penetration and depth range suffer. Or it can contain smaller maghemite grains which result in a response somewhat similar to metal. Volcanic basalts and sand that is derived from them have this characteristic. Ground balancing is then required and there is also some loss in range due to field deflection. Titanomagnetite sand is somewhat lighter in colour than the previous two and likely needs ground balancing facilities.

Eric.

What type of device is held in the left hand?

[Polymer]

What type of device is held in the left hand?

I would guess either a pinpointer or magnetic ground response measurement or so gadget ... I would like to know too ...

One thing in this picture raises a big question for me:

That would be the many,many coil cable windings around the shaft!

Extra coil cable capacitance is said to be the bane of (faster?) PI machines!?

Wondering and hoping to find an answer to this "dilemma".

[dbanner]

Judging from the age of the bearer, I'd have to guess a vacuum tube era device, it looks like a brick! Hahaha, Ferric toes!

[dbanner]

All jokes aside, I think it might be a magnetic susceptibility meter, Eric digs those types of gadgets for his research.
I wish he would clarify, I'd love to know just to make this iconic photo clearer for the archives.

[Ferric Toes]

Simply this-

[dbanner]

Haha!
A pinpointer probe it is! Looks really rugged, built like a tank.

[Ferric Toes]

I would guess either a pinpointer or magnetic ground response measurement or so gadget ... I would like to know too ...

One thing in this picture raises a big question for me:

That would be the many,many coil cable windings around the shaft!

Extra coil cable capacitance is said to be the bane of (faster?) PI machines!?

Wondering and hoping to find an answer to this "dilemma".

There is no cable coiled around the shaft as the coax goes straight up inside the fibreglass shaft sections. In the picture it could be an interference pattern somehow caused by the compression I used to reduce the file size to a more manageable value for posting. Or possibly a degradation cause by re-posting?

Detector on the right is the one used on the beach.

I have never had a problem with coiling a cable even around a metal shaft, provided it is coax. Coax has no external magnetic field to react with anything.

Eric.

[Ferric Toes]

Judging from the age of the bearer, I'd have to guess a vacuum tube era device, it looks like a brick! Hahaha, Ferric toes!

Not even a Nuvistor in sight. Notice the huge battery for size comparison.

Eric.

[Andi68]

I'd be lying if I was not very curious what was working for a circuit in this Pinpointer

[dbanner]

Not even a Nuvistor in sight. Notice the huge battery for size comparison. [ATTACH]50414[/ATTACH]

Eric.

Eric, you must not take any chances on going outdoors until next few weeks have elapsed. We cannot risk loosing you before you give up your archives to the world, then you can wander around the back yard a bit for some fresh air, but not for too long, ok??

[Ferric Toes]

I'd be lying if I was not very curious what was working for a circuit in this Pinpointer

Your curiosity shall be satisfied.

Eric.