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Are you sure that those cans are of same alloy everywhere (same conductivity)?
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To the Geotech Forum. (Inxlusief admin)
If there are more people interested than geoscash1 and WM6 to see a short
demonstration video of Detecting hypodermic needle using elliptical 11" coil with a IB VLF detector.
Than I am willing to make that video.
Let me know.
regards NupiComment
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Can you make clear macro photo (with dimension remark) of hypodermic needle used in test too, and post it here? ThanksOriginally posted by Nupi View Post
And on video, please, show first detailed how needles stick plastic ruler (please use transparent one!) and then how test perform.Comment
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OK, I make it today.
Make you ready to believe in "miracles".
I will not disappoint you all.
WM6, I'm going to do my best.
nupiComment
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whether the test is related to the VLF or PI detectors ?Comment
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I'm more concerned about the can thickness, but it should also be consistent. If you see a symbol like these:Originally posted by WM6 View Post
It should be aluminium.Comment
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There are differences because PI behaviour is related to a wide bandwidth, so thickness-related effects are more pronounced with PI, but basically the test should be the same.Originally posted by Orbit View PostComment
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pi detectors with coil than 6 inches and inductance than 240mh - 300mh and sampling that 6us -21 us frequencies 1khz, successfully can detected hypodermic micro .Comment
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These are the test samples for the MD test.
The used metal detector that I used for the test is, by myself, modified DeepTech Smart (IB) detector with aelliptical 11" frequency is 15-Khz I thought
I want to report some statements that some of us have said.
"Detecting small hypodermic needle using 11" coil with IB VLF detector (no matter of brand), we could really call a miracle.
Sorry, but I don't believe in such "miracle".
"A hypodermic needle could not be detected by a PI even when Eric Foster tried it with a 1us sample delay. The shape of the needle,
with its tiny cross-section, is unable to sustain eddy currents for long enough to be detectable. I would suggest that the only hope
of detecting these items is with a VLF running at a relatively high frequency...................."
"pi detectors with coil than 6 inches and inductance than 240mh - 300mh and sampling that 6us -21 us frequencies 1khz,
successfully can detected hypodermic micro"
Maybe these are already some discussion points.
The video comes tonight.
Nupi.
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Looking forward!
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Yes, for all purposes the alloys used are well defined because of the deep drawing manufacturing processesOriginally posted by WM6 View PostComment
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Thanks for good presentation of testing samples, nupi.
Blood pricker / insulin needles are out of my interest, but OK, if you chose: more - better.
My primary interest is testing chosen hypodermic needle:
NN-2613R
Brown
26Gx1/2”
0.45 x 12 mm
Regular wall
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I want to apologize for the poor quality of the video.
I thought my camera was broken but that is not so,
because the quality of the video from the borrowed camera is just bad.
The problem lies on my Laptop. When transferring the video from the camera's to the Laptop
becomes blurry and of poor quality.
Does anyone have any idea what it could be?
I hope you can see well enough.
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