Author Topic: EEVblog #776 - World's Smallest Digital Dosimeter  (Read 40004 times)

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Offline callipso

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #75 on: September 01, 2015, 08:25:21 am »

I have 6 spare PCB's. Let me know if anyone wants one.


I could also give some away within the european region.

Cheers
Rubi

Ooh, do you have any left?
I wonder... **BOOM
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #76 on: September 03, 2015, 07:09:07 pm »
Today I got the screen and assembled the tube. I've set the pump to 8T (it was the default value). It always reads 0 uR/h... I think the tube is broken... Any extra things to do?

EDIT: it says BAT= 3.8V, 3V = 3.08V HV=360V

imp/min = 34
« Last Edit: September 03, 2015, 07:14:44 pm by dmg »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #77 on: September 03, 2015, 07:37:50 pm »
How HV cap. voltage now?

imp/min = 34 up to 200 it is normal working of Pump cascade and leakage. Its good.

Try touch "+" sensor pin with some metalic. But be careful!
It be increased uRh. If it works, detection circuit is fine.

EDIT!
Also show me photo two sides of your device in high resolution. Not on angle, not as up image.
« Last Edit: September 03, 2015, 07:48:50 pm by shodan@micron »
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #78 on: September 03, 2015, 07:48:21 pm »
My meter measures 308V at HV cap. If i touch with something metalic the uR/h jump a lot and the alarm sounds. I've reset it and now it says between 130 and 172 imp/min but still 0uR/h

By the way how do I wake it up? when it goes to sleep I can only turn it back on by connecting the USB. If I touch the buttons nothing happens.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #79 on: September 03, 2015, 07:59:44 pm »
uR/h is increases when you touch, and line on graph move to "right" after some time, yes?
It means detection circut is fine working.

For wake-up press "up" and "menu" key.

Try set 400-410 voltage in "hide" menu mode, and measure HV cap.

I be wait photo of your PCB (top+bot side) in high resolution.
« Last Edit: September 03, 2015, 08:01:22 pm by shodan@micron »
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #80 on: September 03, 2015, 08:22:24 pm »
I've increased pump voltage to 410 V and I measure 350V at HV cap. My meter is very bad, I'll try at work tomorrow.

Yes, uR/H goes up and the line moves right, that works well.


Here are the pictures, hope they are high resolution enough.





BTW I think it's been working for some time because it was measuring steady 15uR/h, but I moved it to test the HV cap and now it reads 0 uR/h again....
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #81 on: September 05, 2015, 05:58:41 pm »
While dmg building case for device. (problem currently resolved via skype)

I've got a spare 4 micron on Ebay



Of Course it extra price, because it is handmade.
« Last Edit: September 06, 2015, 06:28:01 am by shodan@micron »
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #82 on: September 05, 2015, 09:16:55 pm »
Well, looks like the first geiger tube I used was bad as it was working intermitently and required higher than normal voltage for starting counting. It was also somewhat insensitive. I've swapped it for the other sensor I had and now I think my UltraMicron is 100% working.

I've popped the bad tube open to see what's inside and what was the source of the rattling noise it had. Turns out there was nothing broken inside. The tube has three main parts, the outer can, an inner tube and a glass insulator that caps the inner tube. That glass insulator is loose and it doesn't seem to have any glue residue nor any other evidence suggesting that this came loose, it was just manufactured like that so the rattling noise is perfectly normal.

Here are some pictures (sorry for the very bad focusing, for some reason my phone had a very hard time focusing on the thing....):



 

Offline JackM

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #83 on: September 07, 2015, 01:28:42 am »
I've popped the bad tube open to see what's inside and what was the source of the rattling noise it had. Turns out there was nothing broken inside. The tube has three main parts, the outer can, an inner tube and a glass insulator that caps the inner tube. That glass insulator is loose and it doesn't seem to have any glue residue nor any other evidence suggesting that this came loose, it was just manufactured like that so the rattling noise is perfectly normal.

Thanks for the interesting dissection photos! Pretty simple device when you get down to it.
 

Offline NO_name

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #84 on: September 07, 2015, 08:40:55 pm »
solder it quickly, otherwise and you will have chance to make such photos :)
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #85 on: September 08, 2015, 08:45:33 pm »
I made my first attempt to build the case today. It went relatively OK. For anyone that wants to machine a case like this note that they are made of a very easy to machine plastic. It has to be some sort of ABS with tons of fillers that make it hard-ish and resistant to temperature. It won't easily melt and clog your tool. I've been able to machine it at 10k RPM with a 4-flute 1mm end mill that I normaly use for fiberglass laminates and hard stuff using water as lubricant and the results are good enough for the pourpose. All the mills I have for cutting plastics turned out to be too short for the job.



It's still missing the butons and the scren guard, I plan on making the screen guard out of machined polycarbonate from a CD and I'll try to mill the buttons in acrylic. But well, everything fits!
 

Offline Rubi

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #86 on: September 14, 2015, 06:45:08 am »
Sorry I was on vacation, yes I have one left, pm me your address.

Cheers
Michael


I have 6 spare PCB's. Let me know if anyone wants one.


I could also give some away within the european region.

Cheers
Rubi

Ooh, do you have any left?
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #87 on: September 14, 2015, 07:18:38 pm »
I optimize USB data loading speed up to 0.5 sec  >:D
It up to 100 times faster than the Dave videos   :box: :box:
And also do many small fixes.
 

Offline NO_name

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #88 on: September 18, 2015, 07:31:58 am »
Good job, I already have tested it.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #89 on: September 19, 2015, 08:12:34 am »
I added uSv units and 60 days logs to device firmware and PC software.



But now, all new features is must contain licensed(8$).

I got a lot of offers on the production from many different companies, but not one of them do not agree my fees 1% sale price.
Also i be forced to delete all sourcecode of firmware and PC Software in public repository. I afraid it be steal my project.

Now i provide only "compiled binary firmware".
Without license on it, work almost all features, except new.

Ah... 8$ - it is because... no one... NO ONE of all people who make my devices of many-many years, not donate just a cent for my projects.... no one ...
I think... it little fees for some features and closed source... do people little more generous in future. :)
« Last Edit: September 19, 2015, 08:36:12 am by shodan@micron »
 

Offline JackM

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #90 on: September 21, 2015, 11:58:38 pm »
Also i be forced to delete all sourcecode of firmware and PC Software in public repository. I afraid it be steal my project.

Now i provide only "compiled binary firmware".
Without license on it, work almost all features, except new.

That's too bad to hear :(
I was still planning on making one of these dosimeters of my own and even possibly contributing to the project.
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #91 on: September 22, 2015, 04:40:49 am »
I add payment form here
Also on that page you can see what features locked in freeware mode.

UPD:
We arrived new PCB 4.06 with black mask.
« Last Edit: September 22, 2015, 02:43:31 pm by shodan@micron »
 

Offline dmg

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #92 on: September 27, 2015, 01:01:41 pm »
Why building one when you can build two?

Both are now working, I need to machine a new case for the second one and re-clean it a little bit. The one in the case has a rattling tube, the other has a non-rattling tube. I've checked them for a while and they correlate very well, not only do they stay at almost the same radiation level but they do track each other very well too, if one starts reading higher the other follows the trend very soon. This mostly confirms that indeed I have the radiation record of all microns currently registered within the monitoring system and that the tubes are consistent with each other. Next step is finding something radioactive to test them, maybe I'll hide one of these inside the pile of bananas at the supermarket...

I've had a lot of fun building these, It's hard to find great self-contained and useful proyects that are worth building in these days of arduinos, and this is also a very good lesson on low power electronics and power converters.
 

Offline SeanB

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #93 on: September 27, 2015, 01:33:30 pm »
Big bulk pack of gas mantles will work well as a test source. The cheaper the better, just buy a big pack of the cheapest ones, which will have enough Sr in them to register above your background levels.

If you have piped natural gas that is also slightly radioactive from Radon inside it.
 

Offline apis

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #94 on: September 27, 2015, 04:44:08 pm »
This is indeed a cool project.

I'm sorry if this is a stupid question but why is the isolation so important on the HV side, is it to save battery power or is it because the detection circuit is so sensitive?

(And system shock was a good game  ^-^)
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #95 on: September 27, 2015, 04:48:47 pm »
I'm disappointed in isolation.
All that I have used, is conducting .... is a little .... 10-20 Gohms, but it crirical.
Also some epoxy has blow up(crack) components when polymerized.

Now I do not recommend isolation of HV circut.

And offcourse it is sensitive. for 3uA on low voltage side, it need ultra-high quality components on high voltage side and ultra clean PCB, for low lekage.
Otherwise current be high.

« Last Edit: September 27, 2015, 05:00:44 pm by shodan@micron »
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #96 on: October 04, 2015, 06:03:00 am »
Data loading speed is increased to speed of light  >:D
https://youtu.be/NFmRbfMaSYQ
 

Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #97 on: February 14, 2016, 12:44:23 pm »
Hello,
can I buy the UltraMicron somewhere?
I am very interested in the data the device provides.
But unfortunately I lack the knowledge to build the device.

I want the end of my trip to Japan Blog restart. Of course, the data would be very intresting by fukushima.
Thank you very much
 

Offline shodan@micron

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #98 on: February 14, 2016, 01:55:21 pm »
Dear frank, unfortunately i do not sell it now.
Just because i have no time for it.

By the way!
Yesterday i publish new device, Ultra-Micron gen. 5  !

With new sensor SI-19BGM.
It sensitive for Gamma, Beta and Alpha particle. And now it can measure of particle flux via "particle per square centimeter".

As i can see, this topic has dead :(
It is sad!

Maybe X-Rays scans of Ultra-Micron gen.5 be interested for EEVBlog users.   :box: :box:











« Last Edit: February 14, 2016, 02:05:31 pm by shodan@micron »
 

Offline frank_gamefreak

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Re: EEVblog #776 - World's Smallest Digital Dosimeter
« Reply #99 on: February 14, 2016, 02:05:33 pm »
Dear frank, unfortunately i do not sell it now.
Just because i have no time for it.

No problem, maybe someone else can help me in this forum?

By the way, is this (https://oshpark.com/shared_projects/sQYExg6e) the new one?
« Last Edit: February 14, 2016, 02:10:13 pm by frank_gamefreak »
 


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