Targets frequency response

[B^C]

Hi All,

I have been out bush in the far north of Western Australia for nearly a year now prospecting with some good success. Just arrived back home last night, boy how things change when your away from civilization for long periods of time.

Anyway, i have conducted many extensive tests over the past year with some very good results. Real time out in the goldfields seems the only way i can get the answers i need.

One test leads to more questions & more questions lead to more & more tests.
I will sort through all my test data in the coming weeks & post what i have discovered, there are some very interesting findings that may be usefull to others.

No more so than the extensive tests done on Ground Conductivity Vs Target Response which i am very excited about & seems to open new doors & will explain a lot about the way Targets respond in varying ground conditions. I have found this very interesting indeed & have spent countless hours trying to understand it & test it with real numbers.

I have forgotten how good a home cooked meal is & the comfort of a good woman & a good bed really is, so i'm off to test this out at the moment--no test data on this subject though!

[Tinkerer]

B~C,

thanks for coming back to this most interesting thread. We are curious to see your findings.

Tinkerer

[bugwhiskers]

Hi All,

I have been out bush in the far north of Western Australia for nearly a year now prospecting with some good success. Just arrived back home last night, boy how things change when your away from civilization for long periods of time.

Anyway, i have conducted many extensive tests over the past year with some very good results. Real time out in the goldfields seems the only way i can get the answers i need.

One test leads to more questions & more questions lead to more & more tests.
I will sort through all my test data in the coming weeks & post what i have discovered, there are some very interesting findings that may be usefull to others.

No more so than the extensive tests done on Ground Conductivity Vs Target Response which i am very excited about & seems to open new doors & will explain a lot about the way Targets respond in varying ground conditions. I have found this very interesting indeed & have spent countless hours trying to understand it & test it with real numbers.

I have forgotten how good a home cooked meal is & the comfort of a good woman & a good bed really is, so i'm off to test this out at the moment--no test data on this subject though!

Hi B^C,

You may find the following link an interesting read.

http://goldprospecting.invisionplus....showtopic=3244

regards
bugwhiskers

[B^C]

Tinkerer,

Yes it is an interesting subject that's for sure, i will start sorting the data as soon as i have caught up with the family, been away for a while & need to catch up with all the gossip & spend some quality time with them.
I have over 36Gb of data to sort through & will be more than happy to post it once sorted. I'm happy to see some interest.

Bugwhiskers,

I registered on the link you gave & shall join in on the chat when i get a chance--already planning the next trip, can't tell the Mrs that though just at the moment. Might see you out there some time!

[Aziz]

G'day B^C,

welcome back. I am looking forward to your interesting findings. I am quite interested on your findings as I am now working on the PI and ground anomaly effects.

Aziz

[mikebg]

Specific Frequencies for Gold, Eq and Au :-)

Quote:
B^C07-14-2009, 12:26 AM: "Just wanted to compare findings with others who may have looked for & observed Specific Frequencies for Specific Targets--Eg--Au--Gold--etc.
Also I have read that some believe that higher Frequencies may be better for smaller targets...." Bruce^Crocodile

Hi Bruce,
:-) I could not figure out what is the difference between Au and Gold. May be Au means Aurum Australium. The browser does not find also the chemical element Eq, but it shows that EQ can mean EverQuest or Emotional Quotient :-).
Now the serious issues they care about:
I can answer detailed via Email to all your questions, which I found in your Thread
"Specific Frequencies For Gold". May be Iknow too the answers and a lot of other
issues with your desire to construct a detector hypersensitive to gold. Send me
your questions via email, but please make them a short and clear as for a tabloid. Keep in mind that my knowledge of English Language and Australian terminology
is minimal, so I use machine translation. The machine gave far too meaningless translations of your posts in this forum, perhaps because you did not use the
correct terms. For example your term "circuit" in the above thread should be replaced
with any other term, such "loop" or something more appropriate (you should
specify how) to make the question intelligible.
Experience has shown that the brief explanation that I give on this forum are not sufficient for understanding the processes that formed signal in the sensing network at the presence of ferromagnetic and conductive mediums and subjects. To grasp the essence, I was provided for the Exercise 1, in which we will find the specific frequencies of an single eddy current loop using network analysis. The software for Exercise1 is called "NI_Multisim_Analog_Devices_Edition_10_0_1". I found it free dowloadable in 2007 in the Analog Devices website with 189MB size. Unfortunately I can not find it there, but surely it is somewhere on the Internet. We can continue this thread and doing exercises with other software.
As we will discover with this exercise, the higher frequencies really give a strong signal of the smaller targets and make it difficult the discrimination.. To use this effect, we should change the ground timeconstant so that it to differ significantly from timeconstant of target. However I do not know how the Australian soil increases the ground signal with increasing frequency. Did you made any measurements of Australian soils? Your Mike.

[Qiaozhi]

Quote:
B^C07-14-2009, 12:26 AM: "Just wanted to compare findings with others who may have looked for & observed Specific Frequencies for Specific Targets--Eg--Au--Gold--etc.
Also I have read that some believe that higher Frequencies may be better for smaller targets...." Bruce^Crocodile

Hi Bruce,
:-) I could not figure out what is the difference between Au and Gold. May be Au means Aurum Australium. The browser does not find also the chemical element Eq, but it shows that EQ can mean EverQuest or Emotional Quotient :-)

It does not say "eq", it says "eg" which is a shorthand way of writing "for example". Au is the chemical symbol for gold, which means that the quote references gold twice. Clearly the person who made this quote either has a poor grasp of the English language and/or does not understand that Au and Gold are the same thing.

[mikebg]

Signal flow diagram because of eddy currents

This is valid for each nonferomagnetic conductive object or each conductive soil or water.
The weighting coefficient kn of n-th time constant Tn depends on the shape of the object. If the object is annular (like bracelet), all harmonic coefficients are infinitesimal. The spherical shape of the target increases the weight of harmonic coefficients relative to fundamental coefficient k1.

[mikebg]

Re: Bruce^Crocodile=B^C

Dear Quiaozhi, you are absoltely wrong!
View this branch from the beginning to understand that I, also like you, have been misled about it. He is our favorite friend from Australia Bruce^Crocodile, who is physicist and not a relative of Bruce Candy. He does not act as Crocodile Dundee because he not reviewed his postings before sending it. This is very difficult for me because I'm using translating machine. The bad thing is that I do not understand some of his questions, but the good thing is that using this machine I can answer to some of them.Note my signs :-). They mean

[Qiaozhi]

Dear Quiaozhi, you are absoltely wrong!
View this branch from the beginning to understand that I, also like you, have been misled about it. He is our favorite friend from Australia Bruce^Crocodile, who is physicist and not a relative of Bruce Candy. He does not act as Crocodile Dundee because he not reviewed his postings before sending it. This is very difficult for me because I'm using translating machine. The bad thing is that I do not understand some of his questions, but the good thing is that using this machine I can answer to some of them.Note my signs :-). They mean

What am I wrong about?
Au and Gold are referring to the same thing, and "eg" is shorthand for "for example".

[mikebg]

Bruce Crocodile

Qiaozhi, I think, judging from the subsequent text in the postings, the text "--Eg--Au--gold--etc." should be replaced by " : Ag, Au, gold nugget etc". Bruce knows that there is difference in the conductivity of pure gold (as a chemical element Au ) and natural gold in form of nugget.
Do you read this thread from the beginning? For the whole world, who oversee this wonderful forum, I apologized to Bruce on my awareness of it?
I very much like one Australian comedy "Crocodile Dundee" (1986). Extracts from it can be found on the Internet. I liken B ^ C with the protagonist, because the name "Crocodile Dundee" can write C ^ D. So I decided that the name of C ^ D is not Bruce Candy, but is Bruce Crocodile. Therefore I decided in honor of the B ^ C to put as my avatar an image of the australian actor Paul Hogan from this comedy.
Bruce will probably soon be called in this forum to determine what is the correct interpretation of his posting and if like his nickname be Crocodile.
This guy loses a lot that I do not know his email. I have an important message for him on how to seek gold veins with radio waves emitted by a powerful VLF Australian radiostation. We made experiments with a method patented by Vaino Ronka. Although here in Eastern Europe does not irradiate the earth from such a powerful radio waves, the results with passive metal detector are encouraging.

[WM6]

how to seek gold veins with radio waves emitted by a powerful VLF Australian radiostation. We made experiments with a method patented by Vaino Ronka. Although here in Eastern Europe does not irradiate the earth from such a powerful radio waves, the results with passive metal detector are encouraging.

Discriminating and target ID inclusive?

[mikebg]

Passive metal detector

As described in the following patents, the answer is YES!
Here in Eastern Europe we could not discriminate because the received radio station radiates at relative high frequency 32 KHz.

[mikebg]

Passive metal detector

"Superpulse is a term for very strong man-made radio signals. The two most common instances of superpulses are those transmitted by the VLF transmitter GBZ, and occasionally by an unidentified station on 17.8 kHz. The purpose of superpulses is unknown, but they are believed to be an element of an obsolete sound-based navigational system. Superpulses can overdrive the front-end amplifier of a PC several hundred kilometres away from the transmitter, when a PC with an aerial attached to its soundcard is used as a VLF receiver."
From Wikipedia, the free encyclopedia

[mikebg]

Exercise1: Frequency Response of Sensing Network

The purpose of this exercise is to analyze the formation of specific frequencies for conducting nonferrous ground and metal objects. What is happening inside the sensing network when the target is represented by only one eddy current loop?. The eddy current in this loop is calculated by a differential equation of first order, which forms a time constant L/r. The simplified circuit diagram of sensing network is shown above in posting # 20. For spectral analysis and simulation, the above diagram is transformed to simplified equivalent network shown below in Fig. 11.
Note that in this diagram, the total inductance L of eddy current loop is formed by two windings in series: the secondary one of transformer K1 and the primary one of transformer K2. The forward transfer parameter Z21 of sensing network has dimension of impedance: the electromotive voltage E2 inducedin RX coil (port 2-2 without load), divided to TX coil current (port 1-1). Note that the equation in red frame is valid in frequency domain only.
In the time domain, this network is complicated since every transformer K represents differentiation. This increases the order of DE of the whole system. Therefore, the received voltage E2 is proportional to second derivative of TX current. The analysis in time domain can't show us how target should be excited. The action of sensing network is visible in frequency domain. To analyze how twice differentiation forms specific frequencies for target, we need an instrument NETWORK ANALYZERto plot in complex plane twoport parameter Z21. Search WEB for and download the mentioned above software "NI_Multisim_Analog_Devices_Edition_10_0_1.exe ".