Question - Who first discovered/conceived the principle of the pulse induction metal detector?

[Rocketdemon]

I've tried to get to the bottom of this but failed miserably!

Regards

Pete

[kt315]

http://www.geotech1.com/forums/showt...ory-and-Theory

[Rocketdemon]

Gosh that was quick! Cheers KT

Pete

[kt315]

how it works

[Andi68]

It was Claus Colani

[Rocketdemon]

Wow...That is a great thread!

Thanks Eric!

Pete

[Ferric Toes]

It was Claus Colani

The principle of pulse induction and some of its applications existed long before Claus Colani.

1. 'On the Induction of Electric Currents in Cylindrical and Spherical Conductors' by Horace Lamb, 1884. 'a much simpler treatment' (than sine waves) 'that of the currents induced by the sudden cessation of a previously constant field'.

2. 'Apparatus for geophysical prospecting' (US Patent 2,278,506) 1942. TX pulse and RX switching by a motor driven camshaft which operated switches.

3. 'A Conducting Sphere in a Time Varying Magnetic Field'. J.R. Wait 1951. Both sine wave and step fields are covered.

4. 'A Method of Detecting a Mass of Non-Ferrous Metal Located at Depth in the Earth'. J.H. Wescott, 1955.

5. 'A Pulsed Bomb Locator'. F.B. Johnson 1956.

6. 'Method of Geophysical Prospection'. J.R. Wait (US Patent 2,735,980) 1956.

7. 'Eddy Current Method for Measuring the Resistivity of Metals' C.P. Bean et al. 1959. 'The measurement is made by noting the rate of decay of flux from a bar situated in an external magnetic field that has been rapidly reduced to zero'.

8. 'Method and Apparatus for Remote Detection of Conducting Bodies'. (UK patent 945,365). A. Barringer 1963.

9. 'Improvements in or Relating to Apparatus for Investigating a Medium'(UK Patent 1,036,629). C. Colani 1966. I believe there may have been an earlier one, by a year or two, but I don't have a copy.

Eric.

[Andi68]

But Colani has developed one of the first usable detectors, principle or not

[kt315]

did you open ITMD although one time in your life?

[Andi68]

of course

[kt315]

open first page

[Andi68]

[qute1]

The question is about Pulse induction metal detectors! Does anyone have a definitive answer?

[kt315]

give the (THE) definition 'pulse induction' greys alien from Alfa Centurion.

[qute1]

Thats right it WAS me i was just fishing for compliments...