Photomultiplier Tubes camera build

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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Sun Sep 11, 2016 6:35 pm

Tested the Nipkow CD base with the motor in a clear drum to view any problems ..the motor is epoxied to a nut and the bolt adjusts motor Nipkow height.. should be able to get some thing in focus ....so another problem out of the way .
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Thu Sep 15, 2016 2:51 pm

Looked into how i was going to mount the PMT and light proofing

Pictures show what i am up to ...i am going to use the testing drum as is but place another drum over that in the last photo ....just painted it it black should be room in there for some motor control electronics ..the lid fits over the pmt lid holder that will be glued in place and the large black drum will just come on and off via the lid ...i can also mount that drum on a tripod for testing ...i hope it will become a camera but i am sure i will find out the hard way!
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Thu Sep 15, 2016 8:07 pm

My paint has dried on the end drum so i had a look at the end result of the hardware side of it ...if any thing i have something to test the PMT and different Nipkows.
i am just going to output the video and either try and use my monitor or Gary's software when i get around finishing the rest of it .

That will do for today .
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Fri Sep 16, 2016 7:56 pm

Today i put the PMT in the drum enclosure and and mounted it on the tripod see how that worked at first it did///// little did i know the tripod mount movement was cracked and down went my work on the floor lucky every thing looks ok fingers crossed .
Fixed the tripod so it will not do that again !
Testing the Nipkows tiny scan pointing the camera at my bench light ..looks ok not the most perfect Nipkow and have not cleaned the holes ...made this one few years ago just came in handy for testing ....i will use it to see if i get any results at the time the holes were way to small for my flying spot go .
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Last edited by Harry Dalek on Fri Sep 16, 2016 10:28 pm, edited 1 time in total.
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Viewmaster » Fri Sep 16, 2016 9:41 pm

Strewth Harry, that looks to be one impressive piece of kit.
Demonstrated with moving images too !

I may have to go your way into the stars as a simple photo diode doesn't pick up
my green laser pen.

A small solar cell I just tried is much better but your PMT detector looks to be THE goods.
“One small step for a man,"......because he has Arthritis.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Fri Sep 16, 2016 10:24 pm

Viewmaster wrote:Strewth Harry, that looks to be one impressive piece of kit.
Demonstrated with moving images too !


Hi Albert i try and make it look pretty and hope to get it working its am matter if my PMT cooperates :wink: plan was really just the cd holder and lens then trial and error what works and what i had handy .

I may have to go your way into the stars as a simple photo diode doesn't pick up
my green laser pen.


I sort of recall looking into this colour problem Albert around the time of the flying spot camera i linked you a while back if you notice i used a green laser at the time defocused and a nikow and lens to refocus the nipkow dots ....i used 2 solar cell and head amp it is sensitive to green as most light from the sun is i think this frequency ....could be your light sensitive diode is UV sensitive more than likely ....if you don't know and want to test try a test with different colour leds ......BTW they are not great as normal light sensitive devices but LEDs can be used as this ....i would for your device use a solar cell or bank of them placed different areas of your scan ...they have a large surface area photo diodes and tranys are very directional things .

A small solar cell I just tried is much better but your PMT detector looks to be THE goods.


It will like Green light Albert and from a wider area so keep your green laser ! Yes may be a PMT they seem very sensitive i should find out what it can pick up towards the end of this experiment .
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Sun Sep 18, 2016 8:38 pm

Had to look into how i am to progress now ..i have 2 options try and fit the electronics in the PMT large light proof drum holder ,there would be enough room but power supply would be external ...or have both external .. i think i will go with the first as i want any controls indicators on the back of the large drum .

Setting up trimmers and such should not be to hard i hope ! as the PMT is already in a light proof container ...

So have to start on the mechanical sync and motor control and clock ...

If i can get the camera going i will work on this and see if this one is not to noisy as i have all the parts to this ,it would make it more portable than a studio camera http://www.hardhack.org.au/hv_reg_power

Just looking at my old camera circuit tries on the mechanical sync and motor control first was the flying spot other the polygon mirror go ..pinch a few ideas from both for the new go....video sysnc mixer might use this one again but I am not using PD1 LED 1 R6 and R8..
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Wed Sep 21, 2016 8:53 am

A thanks to Steve O to some PM Answered Questions on the Colour PMT camera i had ,i was mainly worried if i went with a reflective IR sensor the PMT would pick it up Steve had a led one side of the Nipkow and a sensor on the other picked up by holes in the disc as in the encoder jpg picture .
Steve said he had no problem with PMT light pick up of the Led that caused him any problems .

Mine would be a touch different as in the gif animation only using one reflective sensor ....but great animation ,resulting square wave is what you would expect out of the Schmitt trigger in my case the LM311 i have used many times.......Wonder if there would be any benefits of using 2 .,

Be working on the encoder circuit today
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Wed Sep 21, 2016 5:19 pm

Looked into the original flying spot encoder circuit today for testing ,,,still works great i wanted to test the ink on the new printer when i print a new encoder disc for the nipkow ..
I had so much trouble with the original testing as the black ink and white of the paper just gave the same result a reflection around the same level so no switching was possible .
The way i got around it was either use a sharpie permanent black marker or cut out the encoder slots works then but you have the problem of no matter how careful you are doing either there will be variations in the encoders pulse width so jagged raster lines .
Now i just have to print one out no variations in pulse width i hope ! may be if theres a slight wobble to the disc it might show up i will find out .
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Fri Sep 23, 2016 11:13 pm

Using a few circuit ideas that have worked well in the past ,i have started on sync motor control just have to add the Transistor circuit that will drive the motor,more than likely copy the polygon motor transistor part as that work well .
Ic 1 schmitt trigger..... ic 2 monostable and sync pulse width control pulse to video sync mixer..... ic3 400hz crystal clock...... ic 4 Bistable output to motor control ...to be continued .
Been running it on 5 volts at the moment as i only have a 74 version of the 4060 ,
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Sun Sep 25, 2016 5:11 pm

Today i mounted the opto switch tested that and finished off the motor control ,i have not tested that yet run out of time today .
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Fri Sep 30, 2016 8:35 pm

Been working on the 555 Bistable motor control....seems ok at worst 3 Hz slight swing noticed after the LM311 .
Needs a kick start so might put in a start momentary switch just to get the nipkow turning .
As i have found out with every motor i have used each needs a slightly different circuit change but can always get them to work one way or another.
Bit of a muchness but i swapped ic 4's bistable reset and trigger around and left it so swapping the mechanical sync and the crystal clock to either seems to work ...just wanted to see .
Notice the missing sync in my Nipkow encoder slot showing up on the Pc Scope .
I noticed forgot to put in the mosfet type for the motor driver its a irf630n i had handy
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Thu Oct 06, 2016 7:50 pm

Been working on the motor control i found the 555 bistable idea works but i want see this circuit with the 4046 also so at the moment it can use either via just plugging in one ic unplugging the other visa versa..from their sockets
The PMT1 wav and ani gif test point pin 7 of the lm311 the 555 bistable doing the grunt of the work pll wav is the 4046 ..do find the 4046 hits the mark a touch better .
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Sun Oct 09, 2016 9:05 pm

Still working slow and steady put the video sync mixer together yet to test second ic as i just finished it .

Also finished an inverter to give a go later on if all go's well with the bench top supply ,need to increase the feed back resistor on this regulated HV supply need at least another 100 volts so thats another factor .

I think i will use this tin but again if the thing cooperates .....to house the inverter ,like to also run every thing in time off batteries the Lithium Ion seems to run the motor control ok it is only a tiny cd motor .

All well so far play around testing some more in a few more days .
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Re: Photomultiplier Tubes camera build

Postby Harry Dalek » Sun Oct 16, 2016 7:26 pm

Have not had much time apart from 2 hours over the weekend to work much on the project ,i went with getting the inverter a touch better i needed to increase the voltage and change it around to a negative voltage ,pretty much around the -1100 volts i wanted.
Need to get back to the main workings of it and put this aside for now .
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download.jpg
Last edited by Harry Dalek on Mon Jul 22, 2019 5:29 pm, edited 1 time in total.
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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