Electronics > Projects, Designs, and Technical Stuff
clipping a fast negative pulse
brumbarchris:
--- Quote ---This sounds very much like an eddy current sensor
--- End quote ---
Ah, professionals can read between the lines, good catch!
I do not want to withhold information, particularly when asking for help. However, as I am myself not very knowledgeable in this field, I would want to refrain from putting forward the wrong information or hypotheses.
Besides, theoretically, it is much probable to get pertinent and focused and usable answers when you split the big problem in smaller, simpler chunks (simpler than "please design this eddy current detector for me".)
--- Quote ---The impulse method never impressed me.
--- End quote ---
Well, we have to build and extend whatever experience already exists within our company (not much, admittedly, but more than nothing with regards to the pulse induction principle).
Best regards,
Cristian
Kalvin:
It is funny how these toy metal-detectors are still developed and manufactured. Is this due to the lack of competition or what?
StillTrying:
OwO:
I second the suggestion to use frequency domain methods to make impedance and transfer function measurements. This is very common at RF where network analyzers are used to measure impulse response which gives better results than a TDR.
AndyC_772:
--- Quote from: brumbarchris on May 09, 2019, 08:24:29 pm ---
--- Quote ---Wait. Why are you clipping the pulse you fought so hard to perfect?
--- End quote ---
In order to further signal process it and feed it to an ADC eventually.
--- End quote ---
Hang on... what?? You want to precisely clip a signal which is going to be digitised?
In that case, your clipping 'circuit' is two lines of code:
--- Code: ---for (i = 0; i < SAMPLE_BLOCK_SIZE; i++)
sample_data[i] = (sample_data[i] < CLIP_LEVEL) ? CLIP_LEVEL : sample_data[i];
--- End code ---
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