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Offline vector180
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« Reply #10 on: March 01, 2009, 07:25:09 pm »
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mmm I initially thought radar in my ignorance Wink It would do the job no doubt as depth of earth attenuation in my "find the arrow" case is not a problem.  But radar is a reflection and measure of its time to return and on my very small distances to target, the time diff would be almost impossible to discern. Undecided

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Offline vector180
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« Reply #11 on: March 01, 2009, 07:27:23 pm »
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not sure on the freq they use, but Im tipping its a complex and expensive solution.

Must keep this simple, I dont need another year long project :lol

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Offline electech2uTopic starter
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« Reply #12 on: March 01, 2009, 07:53:50 pm »
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the propagation delay could be lengthened by useing ultrasound instead of radiowaves, then it would i believe be sufficiently long to be measured after being converted back to an electrical signal. Much as a bat can detect a mosquito until its in its tail.

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Offline Rick55
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« Reply #13 on: March 01, 2009, 08:17:02 pm »
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Hi I am also an Electronics Technician AA Degree in Industrial Technology, I have worked out in the feild on industrial metal detectors and on the bench, repair and return warranty boards and non warranty equipment.

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Offline electech2uTopic starter
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« Reply #14 on: March 01, 2009, 08:25:43 pm »
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sounds like i could learn alot about them from you. I am interested in the various types of circuits used and their theory of operations. I have already learned quite a bit just from reading here an hour or so, it is really hard to find books on the subject.

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Offline electech2uTopic starter
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« Reply #15 on: March 01, 2009, 08:29:15 pm »
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How did you find a job working on metal detectors, through one of the manufactures?

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Offline vector180
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« Reply #16 on: March 01, 2009, 08:34:18 pm »
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yes rick55 spill the beans Smiley
are we heading up the wrong path...

I too thought about ultrasonics electech2u.I dont think it would work in my case. it would take a fair smarts to "see a metal arrow behind a wooden branch". but then moving 4m sideways should fix that..


something tells me that the metal head  should "ping" a lot louder than the surrounding foliage, Im just not sure what to ping it with just now Wink

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Offline electech2uTopic starter
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« Reply #17 on: March 01, 2009, 08:40:48 pm »
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infrared light ! 

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« Reply #18 on: March 01, 2009, 08:42:58 pm »
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I was working on Industrial metal detectors used in the food proccessing industry 20 years ago they were $10000 to purchase one and weight 485 pounds..

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« Reply #19 on: March 01, 2009, 08:48:34 pm »
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I have worked in a steel mill since march 29,1973 and just got laid off jan 2, thats why i have so much time now to look into things like this, and ive been buying lots of books and reading up on some new areas. I know what you mean by the enormity of some industrial equipment, we have overhead cranes that carry 300 ton lifts, and the machine i run will carry 160 tons in a lift (more actually but that is the official LD LMT.

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