Hi Nelson
Esteban said that the infrared radiation could be used in Lrls and Mineoro used infrared LEDs in some of its models, Also Andreas uses an infrared sensor in his crypton, so it is possible that infrared photography reveals some abnormality in the vicinity of a gold buried object. My idea is to build an oscillator at about 10Khz which drives an infrared LED, a receiver with infrared diode input, LED and diode are shielded from each other and are pointing in the same direction. A small part of the oscillator signal is injected at the receiver to have a stable signal output of the receiver even without optical signal detected by the diode. The output of the oscillator and the receiver should be to a phase comparator. The presence of the "phenomenon" should cause a change in the output of the phase comparator. I'll try this circuit on my return to Italy, but someone else could try it first. With a CD4046 is obtained the oscillator and the phase comparator, with a TL082 the AF amplifier and with a LM358 amplifier CC after phase comparator.
Best Regards
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