[Aurificus]

Originally Posted by Max

Hi,
Congratulations! For the big pile of BS.

I think it doesn't work, and will never work in the real world, maybe yours is different.

Have any idea of what percentage of IR radiation arrives to a deep buried target ???

ZERO. The soil will dump anything your ridiculos 10mW from the led!

The LED you'll not read any measurable variation.

Now look at energy transfer (heath) in ideal conditions between these 2 mass... in the case the silver coin is hotter than soil around it... with a temperature difference of 20°C = 20°K....with wide approximations it's something like this:

The energy release from silver coin is due to Qc= volume_of_coin*volumetric_heat_capacity_for_silver *delta_T(°K)...

so Qc= 4.15*2.44*20= 202.52 joules


I'm sure you didn't realize any of these fairy-tales devices... otherwise YOU MUST KNOW that's impossible detecting something this way.
Kind regards,
Max

Hi Max,

The LED detector DOES NOT (probably Can Not) measure radiated heat from small buried metal objects. (I'm sure I've said this Many times).
J_P's experiment shows that this is not a viable technique even with quality, commercial available equipment.

I have made no claims as to the depth, distance or size of object that can be located. I have also stated that results are likely to be "hit & miss" due to the large number of variables involved. However, I have no reason to disbelieve what Esteban claims.

So…If the LED Detector works it must be "sensing" something else.
My proposal is that it is sensitive to the change of energy levels in the vicinity of a buried metal object. (I call it IR/heat )

From your figures above we have an energy transfer of 200J into and 200J out of the coin over a 24 hour cycle.

If the majority of the change occurred in one hour, (not totally unreasonable because thermal change by conduction is exponential), then the power involved would be about 55mW (think portable phone, wireless network etc.)

But, in My real world this is not a smooth stable process, J_P has clearly explained and quantified the sort of dramatic temperature differences and changes that occur on and beneath the surface under the sort of normal conditions we might expect “in the field” . You yourself have proposed the cooling effects of the wind as an important factor, I fully agree.

A metallic ‘treasure’ target is therefore unlikely to have a "uniform" temperature at any time. The top will always be slightly different to the bottom. This means we have electrons moving back and forward all the time. (……. fluctuating electrical currents in our target object….)
Did I mention Seebeck????


We also have IR radiation continually crossing and re-crossing the interface between the metal object and the surrounding matter dirt…sand…..silicon…………Whats that called?.
(OOPS, more outrageous, impossible, psuedo-scientific mumbo jumbo)


There is enough going on to produce detectable signals!

Scientifically yours,
AURIFICUS