Carl MFD article ,5KHZ frequency ?

[Max]

Originally Posted by Esteban

Hi J_Player,

You emit a IR-laser or IR modulated in audio beam, NO A FIX BEAM in wich you insert the tone via a capacitor. No, you ON and OFF the IR diode at this tone frequency, can be 400 Hz. This tone (modulation) appears as a phase shift in a receiver system. I only try with IR, but sure IR-laser will be better, but much more expensive in comparation. Not for to measure temp, but this beam is like a precisse antenna in wich beam "travel" the phenomenom (because I try it only for old buried items, no for new) and dislocates the system. Also all bodies emit IR, metals in major quantity. But the question is: why I can't detect a person (wich emit IR) but yes a metal buried? What is the associated phenomenom inherent to this? Atomic vibration also? Is very complex!

Hi,
" But the question is: why I can't detect a person (wich emit IR) but yes a metal buried? What is the associated phenomenom inherent to this? Atomic vibration also? Is very complex!"

??? A "person" body emission spectrum have infrared portions due to the heat generation by organic tissue, so at the end, due to chemical reactions that take place inside the body. You can see them by e.g. an infrared camera.
This is the same principle of operation of cheap alarm sensors, passive-IR-detection.

But you mix things talking about "body" radiation (black-body used e.g. in Planck's experiments) and human body !

You say that all things emitt IR ? What a kind of phisics book you have ?

IR emission is possible but for many substances, compounds and "metals" only in hi-energy state!

Where did you see e.g. gold, at room temperature, emitting IR radiations ???

BS.

In IR-lasers that probably you don't know... an "active" material is ENERGIZED in a pumping process to give the right energy level to the material, from which it spontaneosly decade releasing photons with infrared frequency, all in phase one each other.

You have to give external energy to the system to get your IR photons. When you light an IR-led you have to give energy (supply it) to get IR-emission... you can test with your VCR-remote !

There are spontaneous chemical-reactions that generate IR-avalanche etc etc etc an example are chemical-organic-lasers!

But metals, normally, don't emit IR. This is a BS.

So, at first you see the "light" from treasure... now also IR-light !

TONS OF BS.

Kind regards,
Max