Counting photons with an MPPC

On Wednesday, August 21, 2019 at 6:19:01 PM UTC-4, Phil Hobbs wrote:

Well, the MPPC demo system is done. It has four of our small
proprietary boards (controller/SMPS, TEC driver, voltage-controlled
amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end
and a box of voltage regulators. Works from single photons up to about
4 mA in one range.

This video shows it counting photons, which I still think is a cool
thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mts

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Please excuse this naive question as this is not my background, but....
What kind of detector is being used? how do you know if you missed a photon? have two or more coincident ones? or miscounted? e.g. false positives and false negatives.
If my recollection from college physics is correct, a photon has a certain energy level. Do all photons have the same energy level or do they vary? I would imagine if they can contain different energy levels then discriminating between n>1 hits would be very tricky.
Yea, it is cool to count them - thanks for sharing.
J

 

[Jan Panteltje]

On a sunny day (Thu, 22 Aug 2019 08:51:45 -0400) it happened Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote in
<qjm351$qla$1@dont-email.me>:

On 8/22/19 4:27 AM, Jan Panteltje wrote:
On a sunny day (Wed, 21 Aug 2019 18:18:53 -0400) it happened Phil Hobbs
pcdhSpamMeSenseless@electrooptical.net> wrote in
qjkg0h$cl8$1@dont-email.me>:

Well, the MPPC demo system is done. It has four of our small
proprietary boards (controller/SMPS, TEC driver, voltage-controlled
amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end
and a box of voltage regulators. Works from single photons up to about
4 mA in one range.

This video shows it counting photons, which I still think is a cool
thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mts

That movie is a typical waste of bandwidth,
it could be done in a few MB with decent compression.

Kiss my grits.

A typical example of bandwidth waste,
picture is of a static object, only a minuscule scope display has some motion,

AND WE ALL KNOW THERE IS JUST A 555 TIMER AND A POTMETER IN THOSE CLOSED BOXES
;-)

>Cheers

Do not drink so much.

Phil Hobbs

 

jjhudak4@gmail.com wrote in
news:0490f492-9c27-4f56-ae10-6da9a3aa3aca@googlegroups.com:

lol, then there are those who are not well informed. VLC is the
answer to playing almost any video format. Learned about it long
time ago. Great program.

I have been using it since it forst came out. I am pretty sure I
know as much about video as you.

I used to work on the first MPEG-2 satellite equipment.

Not a tech at a TV station.

I was at General Instrument. They went on to develop HDTV.

 

[Phil Hobbs]

On 8/21/19 6:18 PM, Phil Hobbs wrote:

Everybody's a critic. I converted it to mpeg and amended the link.

Well, the MPPC demo system is done.  It has four of our small
proprietary boards (controller/SMPS, TEC driver, voltage-controlled
amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end
and a box of voltage regulators.  Works from single photons up to about
4 mA in one range.

This video shows it counting photons, which I still think is a cool
thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mpg

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[Jan Panteltje]

On a sunny day (Thu, 22 Aug 2019 06:50:58 -0700 (PDT)) it happened
jjhudak4@gmail.com wrote in
<0490f492-9c27-4f56-ae10-6da9a3aa3aca@googlegroups.com>:

On Thursday, August 22, 2019 at 9:47:01 AM UTC-4, Phil Hobbs wrote:
On 8/21/19 6:18 PM, Phil Hobbs wrote:

Everybody's a critic. I converted it to mpeg and amended the link.

Well, the MPPC demo system is done.=C2=A0 It has four of our small
proprietary boards (controller/SMPS, TEC driver, voltage-controlled
amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end

and a box of voltage regulators.=C2=A0 Works from single photons up to about

4 mA in one range.

This video shows it counting photons, which I still think is a cool
thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mpg

Cheers

Phil Hobbs



--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

lol, then there are those who are not well informed. VLC is the answer to playing
almost any video format. Learned about it long time ago. Great program.

VLC is a disaster, removed it long ago, does not even run as root here,
from kindergarten for kindergarten.

Use mplayer ffplay, xine.
mplayer plays it without problems, even a 6 years old version.
ffmpeg to convert it to someting of normal size.

Just imagine poor Joerg downloading that movie
it would use up a year of his data package.

 

[Phil Hobbs]

On 8/22/19 10:08 AM, jjhudak4@gmail.com wrote:

On Wednesday, August 21, 2019 at 6:19:01 PM UTC-4, Phil Hobbs wrote:
Well, the MPPC demo system is done. It has four of our small
proprietary boards (controller/SMPS, TEC driver, voltage-controlled
amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end
and a box of voltage regulators. Works from single photons up to about
4 mA in one range.

This video shows it counting photons, which I still think is a cool
thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mts

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

Please excuse this naive question as this is not my background, but....
What kind of detector is being used?

It's a Hamamatsu S13362-3050. The product will use a tiled array.

how do you know if you missed a photon? have two or more coincident
ones? or miscounted? e.g. false positives and false negatives.

You miss most of the photons. The probability of detection is only
about 40% at most, and only 74% of the area is active. It's roughly
competitive with a PMT.

> If my recollection from college physics is correct, a photon has a certain energy level. Do all photons have the same energy level or do they vary?

They vary. Energy is hc/lambda.

>I would imagine if they can contain different energy levels then discriminating >between n>1 hits would be very tricky.

The pulse height doesn't depend on the photon energy.

> Yea, it is cool to count them - thanks for sharing.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

 

[George Herold]

On Thursday, August 22, 2019 at 10:37:51 AM UTC-4, Jan Panteltje wrote:

On a sunny day (Thu, 22 Aug 2019 07:09:45 -0700 (PDT)) it happened George
Herold <gherold@teachspin.com> wrote in
b3786f54-87c2-4607-a4b6-37d0d3fd39da@googlegroups.com>:

That's OK. I'm sorta thinking about it... there's probably a good paper somewhere.
Here is the classic paper by Aspect etal, it gets everything right...
Some later papers seem confused... but the confusion could be in me. :^)
http://www.lac.u-psud.fr/IMG/pdf/anticorrelation_epl.pdf

Figure 2.

If you run at very low count rates, you get no accidentals, but it takes longer to
get enough counts.. and you also run into the dark counts from your detector.

George H.

The way I see it,
1)
photon is just a mathematical construct,

2)
Imagine an ocean full of waves
in it a pole (atom) with a ball (electron) connected to it with a feeble thin wire.
The PMT or whatever semiconductor or ANY detector that detects single electron events
now is a ball detector.

So these correlated light sources (typically parametric down conversion X-tal)
are a little different. Though I'm still figuring out exactly 'what' is different.

You can't push a button and get a photon... but you can get a detection in one
arm, and then know there is a photon in the other arm. This let's you look
for correlations over a very small time window... which changes the statistics
(somehow). As I said it's not clear to me yet.

George H.

THE BALL WILL BREAK LOSE WHEN THE TOTAL ENERGY PHASE AND AMPLITUDE of the sum of every event in the universe is just right,
Fishysicks then claim 'photon detected'.

So it is in fact also affected by the Voyager spacecraft sending data home.
Sum of waves.

Some then say 'my signal and noise', where my signal is the extra ripples they just created in the pool
by throwing their study book in for example.


I think Planck gave a clear warning that A.E. ignored?


grrrr

 

[Steve Wilson]

Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

The pulse height doesn't depend on the photon energy.

Yea, it is cool to count them - thanks for sharing.

Cheers

Phil Hobbs

OT, but may be of interest.

"Identical photons generated 150 million kilometers apart"

https://arstechnica.com/science/2019/08/identical-photons-generated-150-
million-kilometers-apart/

 

[gray_wolf]

On 8/22/2019 8:31 AM, Phil Hobbs wrote:

On 8/22/19 9:29 AM, DecadentLinuxUserNumeroUno@decadence.org wrote:
Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote in
news:qjm351$qla$1@dont-email.me:

On 8/22/19 4:27 AM, Jan Panteltje wrote:
On a sunny day (Wed, 21 Aug 2019 18:18:53 -0400) it happened Phil
Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote in
qjkg0h$cl8$1@dont-email.me>:

Well, the MPPC demo system is done.  It has four of our small
proprietary boards (controller/SMPS, TEC driver,
voltage-controlled amplifier, and APD bias) plus a handwired
pHEMT-boostrapped front end and a box of voltage regulators.
Works from single photons up to about 4 mA in one range.

This video shows it counting photons, which I still think is a
cool thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mts

That movie is a typical waste of bandwidth,
it could be done in a few MB with decent compression.

Kiss my grits.

Cheers

Phil Hobbs

   They are looking at single photon spurt devices (for lack of
knowledge of the right term) in the quantum computing realm.

   We made power supplies (dynode) for PMTs that are on the F-4
airframe thast can detect single photon events, such as a missile
launch.  That is decades old tech.

   But the counting thing...

   The quantum computer guys like photonic qbits.

"Only God can count that fast..." --unknown

   As to the video, I do not know what to do with an mts file.


Run VLC on it.  Anything with an H.264 codec should work.  (It's the file format
my camera produces natively.)

Cheers

Phil Hobbs

VLC works for me.

 

[Jan Panteltje]

On a sunny day (Thu, 22 Aug 2019 08:04:20 -0700 (PDT)) it happened George
Herold <gherold@teachspin.com> wrote in
<5b894822-c721-4f6b-ad78-76b60335f303@googlegroups.com>:

On Thursday, August 22, 2019 at 10:37:51 AM UTC-4, Jan Panteltje wrote:
On a sunny day (Thu, 22 Aug 2019 07:09:45 -0700 (PDT)) it happened George
Herold <gherold@teachspin.com> wrote in
b3786f54-87c2-4607-a4b6-37d0d3fd39da@googlegroups.com>:

That's OK. I'm sorta thinking about it... there's probably a good paper somewhere.
Here is the classic paper by Aspect etal, it gets everything right...
Some later papers seem confused... but the confusion could be in me. :^)
http://www.lac.u-psud.fr/IMG/pdf/anticorrelation_epl.pdf

Figure 2.

If you run at very low count rates, you get no accidentals, but it takes longer to
get enough counts.. and you also run into the dark counts from your detector.

George H.

The way I see it,
1)
photon is just a mathematical construct,

2)
Imagine an ocean full of waves
in it a pole (atom) with a ball (electron) connected to it with a feeble thin wire.
The PMT or whatever semiconductor or ANY detector that detects single electron events
now is a ball detector.

So these correlated light sources (typically parametric down conversion X-tal)
are a little different. Though I'm still figuring out exactly 'what' is different.

You can't push a button and get a photon... but you can get a detection in one
arm, and then know there is a photon in the other arm. This let's you look
for correlations over a very small time window... which changes the statistics
(somehow). As I said it's not clear to me yet.

George H.

Sure, should that surprise me?
I look at it all from a wave perspective.
QM was shown to be a joke a while ago (something about no more cats etc, was posted here).

OK, will look it up
https://www.sciencedaily.com/releases/2019/06/190603124621.htm

This from an old posting


<start quoting from old posting>

On a sunny day (Tue, 30 May 06 10:55:37 GMT) it happened lparker@emory.edu
(Lloyd Parker) wrote in <e5hmdb$ajs$2@leto.cc.emory.edu>:

Max Planck,
the originator of light quanta. In his recorded remarks which
took place during 1909 in an audience at Einstein's talk we see him
resisting Einstein's hypothesis of atomistic light quanta propagation
through space. "If Einstein were correct, how could one account for
interference when the length over which one detected interference was many
thousands of wavelengths? How could a quantum of light interfere with itself
over such great distances if it were a point object? Instead of quantized
electromagnetic fields, one should attempt to transfer the whole problem of
the quantum theory to the area of INTERACTION between matter and radiation
energy".

(I stole this from http://www.blazelabs.com/f-g-dist.asp ).

<end quoting old posting>


Again, I am no fishysicks so my 'world view' is somewhat less mathemagical.

I always want a mechanism.

OTOH I remember as a kid with my father we build a simple synchronous electric motor,
with a kit called 'mecano' here.
Basically a wheel with metal side tabs and a 50 Hz electromagnet
Spin the wheel and it would run in sync with the 50 Hz field.

I asked my father 'what exactly is that magnetic force, what causes it, how does it work?'
My father said: You will earn that later at school'
He would react that way if he did not know the answer.
I never learned it, just a bunch of ideas..
We do not even know what an electron is, why those repel each other (usually, seems in super-conductors those pair up,
and there was also the 'electron black hole' and I have actually seen a ball lightning hanging in front of me,
IMNSHO opinion that WAS an electron black hole, Murat Ozer is the one that proposed that see
https://arxiv.org/abs/gr-qc/9911011
and so many other things, we know, shit really.
Twenty first century science
take it for what it is worth.
But it IS fun!

 

[George Herold]

On Friday, August 23, 2019 at 1:45:17 AM UTC-4, Jan Panteltje wrote:

On a sunny day (Thu, 22 Aug 2019 08:04:20 -0700 (PDT)) it happened George
Herold <gherold@teachspin.com> wrote in
5b894822-c721-4f6b-ad78-76b60335f303@googlegroups.com>:

On Thursday, August 22, 2019 at 10:37:51 AM UTC-4, Jan Panteltje wrote:
On a sunny day (Thu, 22 Aug 2019 07:09:45 -0700 (PDT)) it happened George
Herold <gherold@teachspin.com> wrote in
b3786f54-87c2-4607-a4b6-37d0d3fd39da@googlegroups.com>:

That's OK. I'm sorta thinking about it... there's probably a good paper somewhere.
Here is the classic paper by Aspect etal, it gets everything right...
Some later papers seem confused... but the confusion could be in me. :^)
http://www.lac.u-psud.fr/IMG/pdf/anticorrelation_epl.pdf

Figure 2.

If you run at very low count rates, you get no accidentals, but it takes longer to
get enough counts.. and you also run into the dark counts from your detector.

George H.

The way I see it,
1)
photon is just a mathematical construct,

2)
Imagine an ocean full of waves
in it a pole (atom) with a ball (electron) connected to it with a feeble thin wire.
The PMT or whatever semiconductor or ANY detector that detects single electron events
now is a ball detector.

So these correlated light sources (typically parametric down conversion X-tal)
are a little different. Though I'm still figuring out exactly 'what' is different.

You can't push a button and get a photon... but you can get a detection in one
arm, and then know there is a photon in the other arm. This let's you look
for correlations over a very small time window... which changes the statistics
(somehow). As I said it's not clear to me yet.

George H.

Sure, should that surprise me?
I look at it all from a wave perspective.
QM was shown to be a joke a while ago (something about no more cats etc, was posted here).

OK, will look it up
https://www.sciencedaily.com/releases/2019/06/190603124621.htm

Yeah I remember seeing that... Some physics types are concerned about
'the measurement problem'.. they don't have a model for how a measurement
works. But that doesn't really bother me. (I mean you can't make a
QM model of a PMT... but so what.)

This from an old posting


start quoting from old posting

On a sunny day (Tue, 30 May 06 10:55:37 GMT) it happened lparker@emory.edu
(Lloyd Parker) wrote in <e5hmdb$ajs$2@leto.cc.emory.edu>:

Max Planck,
the originator of light quanta. In his recorded remarks which
took place during 1909 in an audience at Einstein's talk we see him
resisting Einstein's hypothesis of atomistic light quanta propagation
through space. "If Einstein were correct, how could one account for
interference when the length over which one detected interference was many
thousands of wavelengths? How could a quantum of light interfere with itself
over such great distances if it were a point object? Instead of quantized
electromagnetic fields, one should attempt to transfer the whole problem of
the quantum theory to the area of INTERACTION between matter and radiation
energy".

(I stole this from http://www.blazelabs.com/f-g-dist.asp ).

end quoting old posting


Again, I am no fishysicks so my 'world view' is somewhat less mathemagical.

I always want a mechanism.

OTOH I remember as a kid with my father we build a simple synchronous electric motor,
with a kit called 'mecano' here.
Basically a wheel with metal side tabs and a 50 Hz electromagnet
Spin the wheel and it would run in sync with the 50 Hz field.

I asked my father 'what exactly is that magnetic force, what causes it, how does it work?'
My father said: You will earn that later at school'
He would react that way if he did not know the answer.
I never learned it, just a bunch of ideas..
We do not even know what an electron is, why those repel each other (usually, seems in super-conductors those pair up,
and there was also the 'electron black hole' and I have actually seen a ball lightning hanging in front of me,
IMNSHO opinion that WAS an electron black hole, Murat Ozer is the one that proposed that see
https://arxiv.org/abs/gr-qc/9911011
and so many other things, we know, shit really.
Twenty first century science
take it for what it is worth.
But it IS fun!

Hey I found a decent rev. sci. I. article about single phton sources and detectors.
https://www.dropbox.com/s/1ud9byktcermyvy/single-photon.pdf?dl=0
(I'm sharing it for educational purposes only.)

I never knew there were so many... and that was from 2011.

George H.

 

[Joseph Gwinn]

On Aug 22, 2019, Phil Hobbs wrote
(in article <qjm6cf$e8q$1@dont-email.me&gt:

On 8/21/19 6:18 PM, Phil Hobbs wrote:

Everybody's a critic. I converted it to mpeg and amended the link.

Well, I figured out what was happening on my iMac (running MacOS 10.14.5).

The default application to handle a ".mht´ file is "MPlayerX.app",
which I never heard of: "Copyright Š 2009-2016, Zongyao QU." Well, from
file dates, I must have installed it in 2016, but don´t recall why. Google.
It´s an omnivorous media player - I must have been trying to read some kind
of movie file and failing. In any event, MPlayerX did not know what to do
with a modern mht file, and croaked, yielding a panic dump. I´d guess that
the current version of MPlayerX would work.

It was MPlayerX that wanted permission to control my computer, which was
summarily refused.

Turns out the Quicktime had no problem with the mht file, so changed the
mapping so all mht files will go to Quicktime.

As for the mpg file, that did not work: Quicktime complained that it could
not open the file. From what I´ve read, converting to a mp4 file is more
likely to work, because mht is a container for mp4 files.

Joe Gwinn

...

Well, the MPPC demo system is done. It has four of our small
proprietary boards (controller/SMPS, TEC driver, voltage-controlled
amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end
and a box of voltage regulators. Works from single photons up to about
4 mA in one range.

This video shows it counting photons, which I still think is a cool
thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mpg

Cheers

Phil Hobbs

 

[Jan Panteltje]

On a sunny day (Fri, 23 Aug 2019 06:23:30 -0700 (PDT)) it happened George
Herold <gherold@teachspin.com> wrote in
<10d44f71-6254-4695-aa79-a68bb2aa08dd@googlegroups.com>:

Hey I found a decent rev. sci. I. article about single phton sources and detectors.
https://www.dropbox.com/s/1ud9byktcermyvy/single-photon.pdf?dl=0
(I'm sharing it for educational purposes only.)

I never knew there were so many... and that was from 2011.

Thanks for the paper, am reading it, am at page 6 of 26..
Will take a while.

Yes I have followed some stuff about single photon emission
related to crypto,

I do think those guys make a big mistake there, one article even made me laugh.

From the wave perspective it seems also a joke.
Almost no paper is published these days that does not say 'this will bring the quantum computer a lot closer'.

Same with the ever better battery, but those I do expect to appear for real one day with some real probability.

Your link makes me wonder the same, sure it silly to just look at that single photon case for applications..

If you drop the (wrong) idea that the minimum energy level we can detect is in the form of a single photon,
maybe we can then receive alien transmissions, Alien TV would be interesting.
Right now we are still stuck with (swinging in the direction of politics) a US leader who
declares himself to be 'the chosen one', in my view an other religious fanatic idiot.
https://www.snopes.com/fact-check/trump-second-coming-king-israel/
People seem to follow him like other follow IS and of course he is right (according to those whom he plays).
Wonder when he starts witch burning.
We need indeed better crypto to protect us, but I do not think Photon or Voting ..
will help, better stop here,
I have fun with my PMTs, have 3 now,
More to identify stuff, spectrometry,
AFter I have read your paper I will come back to it, I doubt it will change my ideas though,
Nevertheless it is a nice paper that gives a lot of info o experiments done,

 

Steve Wilson <no@spam.com> wrote in
news:XnsAAB395001E2Aidtokenpost@69.16.179.22:

Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

The pulse height doesn't depend on the photon energy.

Yea, it is cool to count them - thanks for sharing.

Cheers

Phil Hobbs

OT, but may be of interest.

"Identical photons generated 150 million kilometers apart"

https://arstechnica.com/science/2019/08/identical-photons-generated
-150- million-kilometers-apart/

Far out! Best article I've read in a while.

 

[Robert Baer]

Joseph Gwinn wrote:

On Aug 21, 2019, Phil Hobbs wrote
(in article <qjkg0h$cl8$1@dont-email.me&gt:

Well, the MPPC demo system is done. It has four of our small
proprietary boards (controller/SMPS, TEC driver, voltage-controlled
amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end
and a box of voltage regulators. Works from single photons up to about
4 mA in one range.

This video shows it counting photons, which I still think is a cool
thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mts
What kind of file is this? It promptly crashes on my computer (MacOS). It
appears to have asked for permission to control my computer, specifically
through the accessibility features, which are turned off for security
reasons.

Joe Gwinn

Maybe it crashed your computer because you are running Win10, which
started off in a 80% crash state and deserves to be crashed.

I run WinXP and used the VLC player without batting an eyelash.

 

[Jasen Betts]

On 2019-08-22, Joseph Gwinn <joegwinn@comcast.net> wrote:

On Aug 21, 2019, Phil Hobbs wrote
(in article <qjkg0h$cl8$1@dont-email.me&gt:

Well, the MPPC demo system is done. It has four of our small
proprietary boards (controller/SMPS, TEC driver, voltage-controlled
amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end
and a box of voltage regulators. Works from single photons up to about
4 mA in one range.

This video shows it counting photons, which I still think is a cool
thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mts
What kind of file is this? It promptly crashes on my computer (MacOS). It
appears to have asked for permission to control my computer, specifically
through the accessibility features, which are turned off for security
reasons.

Some sort of H.264 - VLC says

[h264 @ 0x7f24f0012140] Format vaapi_vld chosen by get_format().

H.264 is the compression used by MPEG level 4, but MP4 puts
restrictions on frame size and rate.

file doesn't recognie the file type, so presumably the camera has
tacked on some sort of header

--
When I tried casting out nines I made a hash of it.

 

[Jan Panteltje]

In the classic follow-up to me myself way,
this is fun too:
https://www.sciencedaily.com/releases/2019/08/190822165018.htm

paper:
https://arxiv.org/abs/1708.00248

This make me wonder if for any event there is a possible observer that can see all possible outcomes.

 

Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> wrote in
news:qjqmi9$mvs$1@dont-email.me:

In the classic follow-up to me myself way,
this is fun too:
https://www.sciencedaily.com/releases/2019/08/190822165018.htm

paper:
https://arxiv.org/abs/1708.00248

This make me wonder if for any event there is a possible observer
that can see all possible outcomes.

According to Trump, that observer is him.

But we all know he has zero vision in any direction.

 

Robert Baer <robertbaer@localnet.com> wrote in
news:hG18F.83078$9i3.75174@fx42.iad:

Joseph Gwinn wrote:
On Aug 21, 2019, Phil Hobbs wrote
(in article <qjkg0h$cl8$1@dont-email.me&gt:

Well, the MPPC demo system is done. It has four of our small
proprietary boards (controller/SMPS, TEC driver,
voltage-controlled amplifier, and APD bias) plus a handwired
pHEMT-boostrapped front end and a box of voltage regulators.
Works from single photons up to about 4 mA in one range.

This video shows it counting photons, which I still think is a
cool thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mts
What kind of file is this? It promptly crashes on my computer
(MacOS). It appears to have asked for permission to control my
computer, specifically through the accessibility features, which
are turned off for security reasons.

Joe Gwinn

Maybe it crashed your computer because you are running Win10,
which
started off in a 80% crash state and deserves to be crashed.

I run WinXP and used the VLC player without batting an eyelash.

It works fine. It is simply that an 'mts' file is a non-common file
type, and my browser had not made an association for it yet.

Once I pointed it at my player (also VLC) it worked fine.

It looks pretty much to me like you were doing exactly that...
the eyelash batting thing, miss pris.

Somebody said it 'crashed their computer'? I call bullshit.
If someone had a crash playing that file, it was because their
machine is a dogged old POS that can barely play a 320 x 240 much
less real video files.

 

[brian]

In message <f4bc94e6-6f1c-492b-ac39-ebba09198693@googlegroups.com>,
George Herold <gherold@teachspin.com> writes

On Wednesday, August 21, 2019 at 6:19:01 PM UTC-4, Phil Hobbs wrote:
Well, the MPPC demo system is done. It has four of our small
proprietary boards (controller/SMPS, TEC driver, voltage-controlled
amplifier, and APD bias) plus a handwired pHEMT-boostrapped front end
and a box of voltage regulators. Works from single photons up to about
4 mA in one range.

This video shows it counting photons, which I still think is a cool
thing to be able to do.

https://electrooptical.net/www/sed/MPPCphotonCounting.mts
Not loading here...
(OK got it.. pretty cool.)
I've been thinking, reading about photon counting.
Detector efficiency has to be the number one parameter..
(well maybe with time resolution.. short spikey pulses.)

To be sure that you've got one photon, you really need about 5 ;-)

Brian
--
Brian Howie