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On 2019-08-13, klaus.kragelund@gmail.com <klaus.kragelund@gmail.com> wrote:
On Tuesday, 13 August 2019 09:31:26 UTC+2, Jasen Betts wrote:
On 2019-08-12, Klaus Kragelund <klauskvik@hotmail.com> wrote:
Hi
I need a light focusing tube, to turn a green led with viewing angle of 120 degrees down to a small spot
Which LED, how small?
Can you use an SMD LED instead?
I cannot use a smaller LED. This one is a 5W++ one, so has a certain size
I guess you need some sort of lens then, but you cannot focus the spot any
smaller than the LED die because entropy.
On Tuesday, August 13, 2019 at 5:28:52 AM UTC-7, klaus.k...@gmail.com wrote:
On Tuesday, 13 August 2019 02:10:32 UTC+2, George Herold wrote:
On Monday, August 12, 2019 at 5:21:25 PM UTC-4, Klaus Kragelund wrote:
Hi
I need a light focusing tube, to turn a green led with viewing angle
of 120 degrees down to a small spot
I was thinking about light reflective mylar, but am open to suggestions?
This is for test equipment, so anything goes đ
Regards
Klaus
Huh, we use to electroplate copper onto SS cones... very long tapers,
a few degrees.. to focus FIR (say 10-100 um) onto a detector.
One grad student designed a parabolic reflector..
that did better. This is not for imaging, but just gathering as many
photons as possible.
What about a lens?
Lens could be an option, but has to be indifferent to the length from
the object, so it is robust against production changes
Sounds more and more like you need a cheap laser diode w/driver then, not an LED. Does the spot of light *have* to be green?
Yes, a Laser seems to be the way forward
On Wednesday, 14 August 2019 06:14:50 UTC+2, nu...@bid.nes wrote:
On Tuesday, August 13, 2019 at 5:28:52 AM UTC-7, klaus.k...@gmail.com wrote:
On Tuesday, 13 August 2019 02:10:32 UTC+2, George Herold wrote:
On Monday, August 12, 2019 at 5:21:25 PM UTC-4, Klaus Kragelund wrote:
Hi
I need a light focusing tube, to turn a green led with viewing angle
of 120 degrees down to a small spot
I was thinking about light reflective mylar, but am open to suggestions?
This is for test equipment, so anything goes đ
Regards
Klaus
Huh, we use to electroplate copper onto SS cones... very long tapers,
a few degrees.. to focus FIR (say 10-100 um) onto a detector.
One grad student designed a parabolic reflector..
that did better. This is not for imaging, but just gathering as many
photons as possible.
What about a lens?
Lens could be an option, but has to be indifferent to the length from
the object, so it is robust against production changes
Sounds more and more like you need a cheap laser diode w/driver then, not an LED. Does the spot of light *have* to be green?
Yes, a Laser seems to be the way forward
And it has to be green
Cheers
Klaus
On Thursday, August 15, 2019 at 8:35:32 AM UTC-4, klaus.k...@gmail.com wrote:
On Wednesday, 14 August 2019 06:14:50 UTC+2, nu...@bid.nes wrote:
On Tuesday, August 13, 2019 at 5:28:52 AM UTC-7, klaus.k...@gmail.com wrote:
On Tuesday, 13 August 2019 02:10:32 UTC+2, George Herold wrote:
On Monday, August 12, 2019 at 5:21:25 PM UTC-4, Klaus Kragelund wrote:
Hi
I need a light focusing tube, to turn a green led with viewing angle
of 120 degrees down to a small spot
I was thinking about light reflective mylar, but am open to suggestions?
This is for test equipment, so anything goes đ
Regards
Klaus
Huh, we use to electroplate copper onto SS cones... very long tapers,
a few degrees.. to focus FIR (say 10-100 um) onto a detector.
One grad student designed a parabolic reflector..
that did better. This is not for imaging, but just gathering as many
photons as possible.
What about a lens?
Lens could be an option, but has to be indifferent to the length from
the object, so it is robust against production changes
Sounds more and more like you need a cheap laser diode w/driver then, not an LED. Does the spot of light *have* to be green?
Yes, a Laser seems to be the way forward
And it has to be green
Cheers
Klaus
Well you're in luck then, direct green laser diodes are now on the market.
(hmm not much stock... and you have to drive them hard for ~40 mW of power.)
https://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/PL-520_B1/PL520_B1-ND/5719264
8 volts V_F at 100= mA.... It's gonna get hot too!.
How many photons/ sec do you need?
On Mon, 12 Aug 2019 14:21:21 -0700 (PDT), Klaus Kragelund
klauskvik@hotmail.com> wrote:
I need a light focusing tube, to turn a green led with viewing
angle of 120 degrees down to a small spot I was thinking about
light reflective mylar, but am open to suggestions? This is for
test equipment, so anything goes ?
Fiberoptic light pipe:
https://www.mouser.com/Optoelectronics/LED-Indication/LED-Light-Pi
pes/_/N-b1d20?P=1yzug3o> The 60 degree entry angle worries me. I
guess try it and see if the pipe grabs all the light, or just get
a wide diameter fat pipe. There are adapaters to install a lens
on the end.
https://www.google.com/search?q=fiber+optic+light+pipes+led&tbm=is
ch> Some interesting stuff:
https://i-fiberoptics.com/engineering.php?summary=104&cat=light-pi
pe-kits
On 15/08/2019 14:28, George Herold wrote:
On Thursday, August 15, 2019 at 8:35:32 AM UTC-4, klaus.k...@gmail.com wrote:
On Wednesday, 14 August 2019 06:14:50 UTC+2, nu...@bid.nes wrote:
On Tuesday, August 13, 2019 at 5:28:52 AM UTC-7, klaus.k...@gmail.com wrote:
On Tuesday, 13 August 2019 02:10:32 UTC+2, George Herold wrote:
On Monday, August 12, 2019 at 5:21:25 PM UTC-4, Klaus Kragelund wrote:
Hi
I need a light focusing tube, to turn a green led with viewing angle
of 120 degrees down to a small spot
I was thinking about light reflective mylar, but am open to
suggestions?
This is for test equipment, so anything goes đ
Regards
Klaus
Huh, we use to electroplate copper onto SS cones... very long tapers,
a few degrees.. to focus FIR (say 10-100 um) onto a detector.
One grad student designed a parabolic reflector..
that did better. This is not for imaging, but just gathering as many
photons as possible.
What about a lens?
Lens could be an option, but has to be indifferent to the length from
the object, so it is robust against production changes
Sounds more and more like you need a cheap laser diode w/driver
then, not an LED. Does the spot of light *have* to be green?
Yes, a Laser seems to be the way forward
And it has to be green
Cheers
Klaus
Well you're in luck then, direct green laser diodes are now on the market.
(hmm not much stock... and you have to drive them hard for ~40 mW of power.)
https://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/PL-520_B1/PL520_B1-ND/5719264
8 volts V_F at 100= mA.... It's gonna get hot too!.
How many photons/ sec do you need?
That's a worryingly large amount of coherent radiation needing safety
interlocks. A class 3A 5mW green laser pointer will comfortably put a
spot onto high clouds and be easily visible in daylight at closer range.
Class 2 <1mW would be safer.
On Thursday, August 15, 2019 at 7:15:15 AM UTC-7, Martin Brown wrote:
On 15/08/2019 14:28, George Herold wrote:
On Thursday, August 15, 2019 at 8:35:32 AM UTC-4, klaus.k...@gmail.com wrote:
Yes, a Laser seems to be the way forward
And it has to be green
Cheers
Klaus
Well you're in luck then, direct green laser diodes are now on the market.
(hmm not much stock... and you have to drive them hard for ~40 mW of power.)
https://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/PL-520_B1/PL520_B1-ND/5719264
8 volts V_F at 100= mA.... It's gonna get hot too!.
How many photons/ sec do you need?
That's a worryingly large amount of coherent radiation needing safety
interlocks. A class 3A 5mW green laser pointer will comfortably put a
spot onto high clouds and be easily visible in daylight at closer range.
Class 2 <1mW would be safer.
"Worryingly large amount" indeed- am I reading that datasheet correctly?
30 mW optical power output *minimum*?
What's being tested- burn resistance?
Mark L. Fergerson