Hello, we are making a thesis where we use MOSFETs as an alternative radiation detector. So to explain it, it works when the mosfet is irradiated with an external radiation source; its voltage threshold increases, which will be used to determine the radiation dose. I'm currently asking for help on how we measure the voltage...
Interesting, I've never thought of doing it exactly this way. Usually I see high surface area PIN junctions used to detect particle impact either by reverse biasing the junction or by directly measuring induced voltage. The amplification stage is not so easy. This is for particle counting and energy measurement though.
What kind of radiation are you measuring? Gamma I guess?
I guess the first thing that comes to mind is that for a given signal, as Vgs increases perhaps the on-resistance at a given voltage does too? If so, it might be easy to measure the voltage drop across the MOSFET on resistance and how it changes with dose.
If I think of anything else though, I'll let you know!
Edit: I suppose you could also use an R/2R network to provide an increasing voltage to the MOSFET base, and measure the point where the output reaches some threshold, a direct measurement of Vgs. That should be pretty easy using one full output port of an Arduino and one of the ADCs.
I immigrated to Vietnam in 2012. Even though government and society was much more welcoming than this case, the overall experience was... not that different!
Maybe immigration is just a pretty awful experience overall.
So I once made the mistake permitting a client to store some (say a dozen) boxes of financial records in my home for a couple of weeks. By 'permit', I mean they just dumped them there, and I didn't physically restrain them from leaving. This is in Vietnam, where you are required by law to keep your corporate records for 35...
I mean, it would have been better if they didn't go out of business, and paid my invoices. Barring that, at least I'm left with something to laugh about!
Maybe someday, but it's exhausting. I would probably be much happier if I just closed shop and went to do a PhD. I might even be able to afford to, in a couple of years.
Then maybe teach engineering in some unknown university in the countryside. Or run a machine shop that helps artists make things. Or just build alarmingly large robots for no reason at all.
Haha...yeah. I'm an academic at heart and my first few years at running a business were a complete disaster. I've since graduated into being a mediocre businessperson, which is probably about as far as I intend to get.
There are a few started on different servers, but I set one up locally. Normally I spend some time on Reddit answering questions from travelers &c as a bit of a public service, but with Reddit becoming boring, I figured I'd give that a try over here.
Vietnam is a friendly but notoriously opaque place, so there is usually no shortage of questions 😄
MOSFET as Radiation Detector
Hello, we are making a thesis where we use MOSFETs as an alternative radiation detector. So to explain it, it works when the mosfet is irradiated with an external radiation source; its voltage threshold increases, which will be used to determine the radiation dose. I'm currently asking for help on how we measure the voltage...
"Assume the role of a Chinese immigrant"? 没问题. (lemmy.world)
I can guess what happened here (voltage.vn)
I'm sure someone was complying maliciously here, but I'm not sure who....
Dispose of financial records? You got it, boss.
So I once made the mistake permitting a client to store some (say a dozen) boxes of financial records in my home for a couple of weeks. By 'permit', I mean they just dumped them there, and I didn't physically restrain them from leaving. This is in Vietnam, where you are required by law to keep your corporate records for 35...
Turning something ugly into something beautiful (voltage.vn)
This is a story about something that was entirely unlikely to turn our wholesome, but somehow did....