I think i discoverd something (Pulse Induction working on 8.5v / 10mA)

[xpcam]

Hi,

After some poor results by making a pulse induction detector (gold ring +/- 15cm/6 inch) i started to experiment with my schematic and did some huge changes... I was hopeless and dissapointed.

But...

I use a 8" coil and i mannaged it now to detect my Stanly Knife at +/- 8 cm with only 8.5 volts and 10mA did some one else get this by testing!?

I thirst thougt it was my hand (opamp faults) but it didnt. And a another thing. In some of my testing i could even see if it was ferro or non-ferro.

Some one have an explenation?!

[kt315]

something I do not grasp in your report. standart minimal current for a PI is 100mA. what PULSE WIDTH you use?

[xpcam]

My pulse width is 200uS

[Thomas]

schematic and pictures are worth a thousand words.

[xpcam]

schematic and pictures are worth a thousand words.

I know, but i want first to test some more, mayby i could get it even better and set a claim on it. For so far i didnt find any claims or information that looks like the things i did. Thats why i will not add a schematic this time.

I was only wondering if anyone got a pulse induction to work on 10mA. I can remember by doing some physics, and i just did some tests with it and my theory works. I thirst wouldnt believe it but it does realy work.

Soon ill add a movie on youtube.

Christian

[6666]

Xpcam if you want to patent your invention you need to do some reading first, you can try this link for starters.
http://www.geotech1.com/cgi-bin/page...le=patents.dat

or google the words pulse induction metal detector patent
gives me 122,000 hits. then click images and study what images appear.

[Chet]

Hi,

After some poor results by making a pulse induction detector (gold ring +/- 15cm/6 inch) i started to experiment with my schematic and did some huge changes... I was hopeless and dissapointed.

But...

I use a 8" coil and i mannaged it now to detect my Stanly Knife at +/- 8 cm with only 8.5 volts and 10mA did some one else get this by testing!?

I thirst thougt it was my hand (opamp faults) but it didnt. And a another thing. In some of my testing i could even see if it was ferro or non-ferro.

Some one have an explenation?!

Hi xpcam
One explanation would be the type of meter you are using. Some meters will not average fast pulses properly. One of the older analog meters with a needle movement might work. If you are pulsing a 300-400 uH coil with 8.5v for 200 us, then each pulse is probably climbing during the time constant of the coil to 1 to 2 amps of current. If you are pulsing 1000 times a second then the average current should be around (1000 X 0.000200 sec) = 0.2 = 20 percent average of 1 to 2 amps. Which would be equal to 200 to 400 ma of average current.
I hope this helps,
Chet

[xpcam]

Hi Chet and 6666,

I have an Tektronix TDS 1012 (full digital 100mhz) oscilloscope and my power suply is an Philips Fluke. and for 6666 i have checked all patents and non does say or have my discovery. If contacted some companies and waiting for results and get it patented.

[Chet]

Hi Chet and 6666,

I have an Tektronix TDS 1012 (full digital 100mhz) oscilloscope and my power suply is an Philips Fluke. and for 6666 i have checked all patents and non does say or have my discovery. If contacted some companies and waiting for results and get it patented.

Hi xpcam
I am concerned about accuracy of the low 10 ma current reading. I just checked my Minipulse Plus board current with the coil disconnected. Just the on board ICs and transistors idling are drawing 42 ma with an 8.5v supply. With the coil connected it draws 220 ma.
Best regards,
Chet

[Funfinder]

Congratulations!
If it works this invention would be great for power saving on a larger level (for big P.I. detectors)
or for pinpointers and you should check out first how good it detects buried stuff.

If possible measure the used amount of current directly at the battery
or if you can't insert there some 500 - 1k resistor and try it if it still works.
This will reduce the voltage, so you will see if the circuit also runs with 2-3v less.

btw. 1/5 sec pulse is far too long and needs too much engery,
but you might program it for 5 times per sec. with a much shorter pulse.

[xpcam]

Im sorry detector buddy's, i can't give anymore details. (Patenting)

Christian

[Funfinder]

Shure, and inform us when its available so we can enjoy its geniousity.

[xpcam]

Hehehe im pretty shure it will! Im still shaking by the discovery! Did not sleep for 2 days now! Also the discovery comes with many problems (not electronics) but to tell no more details. Hihihi its for sale

[Qiaozhi]

Before you get too excited about your "new discovery", please be aware that searching existing patents may not reveal whether the technique is already known about. It will only confirm that a particular technique is/was protected under patent law. A huge amount of metal detector technology is considered prior art, and (although not inconceivable) it is highly unlikely that a completely new method of metal detection is going to be discovered.

We already have BFO, Off-Resonance, PLL, T/R, IB/VLF, PI, Magnetometer, 2-Box, Hall-Effect, etc., (there are probably others I've missed) and any "new technique" is highly likely to be a variation of one of the above. Even PI-5 in ITMD is a variation of a PI design, but using a method of flyback blanking instead of the normal sampling method.

I don't want to rain on your parade, but you also need to consider that patenting a design (assuming it's considered novel enough to be accepted) will cost a huge amount of money to defend in court if anyone copies your idea.

On a more light-hearted note ... you could always take out an Australian Innovation Patent.
http://www.newscientist.com/article/...l#.VNCd_9-uO1I
http://www.cs.virginia.edu/~gfx/Cour...l%20Patent.pdf

Very inexpensive, but not worth the paper it's written on.

[xpcam]

Hi Qiaozhi,

I have checked all of these detectors and no one is like the detectors you have mentioned. I will contact my brother in law he is master of science mayby he can tell me what i have discovered. but i already now what i have discovered i only need confirmation.

Christian