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short time, single electric signal measurement ?

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alexou

New Member
what will be the best mean to detect very short single electric pulse ?
signal caracteristic are
- amplitude of around 10-100 meV
- time length ranging from 10fs to 1 ns.
- no periodic signal

What about the ultimate oscilloscope performance ? do i have a chance doing that ? may i differentiate 10 and 50 fs time lenght ?
or should i go to electo-optic detection..............
thanks in advances !!!!!!!!
 

duffy

Well-Known Member
Ten femtoseconds corresponds to devices that operate in the terahertz frequency range. These are very exotic. There are no oscilloscopes that operate in this range.
 

crutschow

Well-Known Member
Most Helpful Member
mev stands for million electron-volts. It is a measure of energy, not voltage.
 

alexou

New Member
oops, sorry i wrote too fast, the signal we have and we want to differentiate have certainly pulse length comprised between 10ps (not femtosecond) to 1ns.
just want to know if one has already use a oscilloscope with high frenquency range (20 Ghz or more) and if they can at least constrain a upper limit for the pulse duration (and thus, which limit can be expected with an oscilloscope ?).
Actually we know (measure) the pulse is below 20 ns and we believe (calculation) it should be in the 10ps scale. If an existing oscilloscope can provide info like "the pulse is below 100 ps", we are interrested to know that.
maybe i should ak directly to guy from tektronix or other, but if someone know here, let me know.
if you know also some company which my rent such equipement for few weeks, let us know.
thanks to you all.
:)
 

alexou

New Member
i might be afraid that usualy :
meV is for milli electron volt, MeV is for the Mega electron volt.
sure this is energy, sorry, i had written my initial post a bit too fast....but the conversion between eV (energy) and voltage (V) is pretty obious for electron...........
 

duffy

Well-Known Member
oscilloscope with high frenquency range (20 Ghz or more) ...maybe i should ak directly to guy from tektronix

Yes, talk to somebody at Tektronix. They might have a 20 ghz scope, but I think their fastest is more like 8 ghz, and to operate that you are working with fixtures and plumbing instead of scope probes.

We could help you more with this if you tell us what you are trying to do.
 

crutschow

Well-Known Member
Most Helpful Member
i might be afraid that usualy :
meV is for milli electron volt, MeV is for the Mega electron volt.
sure this is energy, sorry, i had written my initial post a bit too fast....but the conversion between eV (energy) and voltage (V) is pretty obious for electron...........
Okay, so it's milli not mega.

But there is a difference between energy and voltage, and you can't convert eV to volts with the information you provided. 1 mev is not necessarily 1mv. It's similar to saying the signal energy is 1 Joule. To convert energy to voltage you need
1. The number of electrons
2. The impedance of the circuit.
3. The exact pulse width
 
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