Ultrasonic detection

[Funfinder]

Why not?
If some embryo becomes visible inside of the womens womb
(perhaps at 5cm 2'' depth) it might be possible to scrub over
wet grass by pressing the sensor tight to the floor and
see something "showy" on the smartphone etc. screen.

I guess this depends just on the strenght of the ultrasonic
signals (perhaps also the frequency) and how "reflective"
are the soil-conditions.

I found this idea by my own but afterwards I saw that
there exists already a thread about ultrasound detection
in some other forum:
http://www.treasurenet.com/forums/gr...-detector.html

[Carl-NC]

It's been brought up quite a few times. I worked with ultrasound designs at both Analog Devices and Maxim, it's impractical for ground searching.

[homefire]

I've explored this a time or two. I think it could have possibilities being used like Earth Resistance techniques. There are quite a few Simple circuits designed for chit like locating Bats of all things at hand you could play with. GooGle DIY Ultra Sonic Bat Locator. Piles of hits.

Good Ol Arduino shows up yet again. LOL Maybe different emitter and sensors could be adapted for ground use ? Cheap and Easy way to have a go at it I guess !

https://www.youtube.com/watch?v=kQRYIH2HwfY

[Funfinder]

The problem is that with reflecting "pressure" waves (audible noise is just a change of air-pressure and so is ultra sonic)
the contrast has to be extremely high. In air already a thin paper in front of the ears can block 20% of the energy.

For sea-sonar and underwater-surface structure-imaging its OK because there is nothing than water inbetween.
So at least at muddy swamp regions it should work with high enough energy and good signal-noise recognizing receiver.

[homefire]

Yep, You could use it to take static Photo like measurements like a resistance reading but your not going to get it to sweep as in the air.

[chrislv426]

I don't know if the following technique for landmine detection could be adapted for searching for artifacts buried in the ground.

https://www.ll.mit.edu/sites/default..._1standoff.pdf

[Funfinder]

If you can cause the mine "vibrating" without explosion and you can detect this noise
it might work.

You also could use a very powerful laser directly by burning holes into or extremely heating
the soil and ignite the mine after knowing the exact location. As long as plants and stuff
around don't catch fire.