info about underwater systems ?

[Amaterasu]

Hi all, sorry if the question may be boring, but i am searching informations all around (and sorry in advance for bad English, is self-learned and not my country language)

Excluding proton-precession systems, what can be the better system for search metallic masses in water from the surface, that may have the maximum distance range ?

Basically, something trained (towed ?) from a boat, that can go underwater (in a sealed case) and can detect metals (ferrous) at the maximum distance possible ? ... I read time ago about coupled fluxgates system, is it realizable (buildable ?) artigianally ? ... And does it work well, or there are more efficent systems that can be realized at hobbystic level ?

Thanks in advance for any informations.

[waltr]

IF you are looking for large ferrous objects then a Magnetometer should work.

Check the other sub-forums here for some info on building magnetometers.

[kt315]

for hobbystic level you can just start learning subsection of this site http://www.geotech1.com/cgi-bin/page...e=projects.dat
also read 'welcome' of the moderator http://www.geotech1.com/cgi-bin/page...&file=main.dat

[Amaterasu]

Thanks.

[Amaterasu]

Hi, one more question, if i can ask ... i am more or less a maniac of the "do-it-yourself", and thinking about self made fluxgates sensors if possible (have discrete knowledges about analog and digital electronics, worked in this field for 23 years repairing and prototyping, also experimenting modifications of pulse-induction units in my free time, but i am definitely NOT good in programming), but i have found very few "technical" (i mean, scientifical, theory principles, and so on) instructions about them, only generic articles ... some of them give some interesting ideas, but i am also interested in studying the theory if available, does anyone know if there are technical books, articles, or similar informations about self made fluxgates sensors ?

Used google, yes, but apparently 95% of results about fluxgates are sellers, advertisement, or garbage ... very few "good" informations ... (language is also an obstacle, but i am improving it, or at least trying )

[Qiaozhi]

These documents might be of interest ->

[Amaterasu]

Thanks, i already had one similar to the second one (the one mentioning the FGM-3 units), and the other 2 ones have other interesting informations inside.