p.3 #1 · Flying projectile pass through a falling droplet.
Hey Frans, Luxeon makes about the brightest LEDs that I know of. I've actually used one of their 3 watt LEDs to illuminated some abstracts. This shot was taken hand held with no flash -just the light of the LED:
Granted you'll need the flash to stop motion, but you might be able to use an LED to illuminate the background.
p.3 #2 · Flying projectile pass through a falling droplet.
Thanks for the link!
I've commanded 22 leds like this:
SeoulP4 leds The max current at 1Khz 1/10 dutycycle (or 100 usec) is 1800 mA. together with this leds also the Fraen Collimator-Lens Elliptical Fraen Narrow Beam with housing - lambertian with Beam Divergence: 6 - 10°
As the distance will be very short I hope to used them as flash.
p.3 #4 · Flying projectile pass through a falling droplet.
Thanks Sam Bortol!
After the failure of my new color pigment dropper I've restart my project. The cause was the high force needed to move the color droplets. After the rework now I've a mechanical transmission of 1/4, giving me 4 times higher force. Also the index steps system to put the amount of pigments is changed to work with lower forces.
The mechanical transmission is now ready, to tomorrow I hope to finisch the complete setup and make the tests again. If it's work I will give the pictures ( fine mechanics)
Frans.
p.3 #6 · Flying projectile pass through a falling droplet.
Oh my...I'm still new to FM but have never seen anything like this anywhere. Out of this world frans, but I know I just sound like everybody else at this point.
My favorite of these postings is the second bubble shot where the sphere has just ruptured.
p.3 #7 · Flying projectile pass through a falling droplet.
Thanks Hockey man and Dan Olmstead!
This evening, I finish my color inject system (second version). Unfortunately I've to make a new power system for the magnets. But the injector works nice now in my test version.
Tomorrow I will purchase the necessary parts. My intention is to have the first and the second droplet diferrent colors so that the spashes are multicolors and different into the bottom and the top. The injector is now tested with timings between 50 and 100 msec sufficient to program the exact value. The color pigments are injected into the falling droplet. I will make images of this injections next week. After that I need 2 extra injectors so that I can mix and change the colors by programming the controller. 2 or 3 injectors together give new colors as the mix during the falltime of the droplet.
Frans.
p.3 #9 · Flying projectile pass through a falling droplet.
Thanks Rob Hickey!
Today I finisch my color pigment injector:
The tests gives now positive results! The next days I will try to give real images of the pigment injector details and the results on the splashes. Now I have to add the timing controls to my hardware.
Frans.
p.3 #12 · Flying projectile pass through a falling droplet.
Thanks _evt_ ,
Today I've tested the pigment color injector, but that was not easy! After hours of trimming all the timings I have found the values for synchronisation. But the pictures are not as expected. The color pigment are to fine when the are ejected from the needle. I've changed this by removing the needle to have a small color pigment droplet to eject. This give better images.
Here are a few examples:
I will work on more tests this day's to see if better images are possible.
p.3 #15 · Flying projectile pass through a falling droplet.
Thanks again Dalantech and John Hanon,
But again, 4 day's works for a few pictures i'ts a hard job!
I 've put the pigment injector aside and start again the milling machine to make a new toolset. I will do again waterfigures with a other combination. The highpower leds are not jet furnish so this must wait a few day's.
Perhaps this evening I wll have new pictures. If it's works!
Frans.
p.3 #16 · Flying projectile pass through a falling droplet.
This is fantastic! I like your design for achieving some mechanical advantage for moving the syringe.
The real problem is the type of syringe used. Those insulin syringes can have a very high friction force to overcome and it varies from syringe to syringe. You can use some types of lubricant on the rubber seal but other types of lubricant will cause that material to swell.
Where I work, we use many special syringes to inject precise volumes of samples or standards into gas chromatographs or GC-Mass Spectrometers. These syringes do not rely on an elastic seal. Instead, they have a glass barrel precisely machined inside and a stainless steel or glass plunger precisely machined to fit very close inside the barrel.
This achieves a seal without having anything actually rub. So the syringes are extremely easy to move. They're virtually frictionless. Thus, the only force you'd need to overcome is the pressure of moving the liquid through the needle. These are sometimes operated by hand for hand injections or for performing "spiking" or preparation of dilutions, but most of the time, the injections into the machines are performed by machine. This makes the injections very repeatable which is critical for accurate analyses.
A syringe of that sort would be perfect for your use. A web search for "autosampler syringe" will yield many hits showing this type of syringe. Perhaps you can find some of these syringes in your area. There are almost certainly laboratories near you who are using this type of device and suppliers who will have them available.
There are also a number of machines that use stepper motors driving worm-gears which in turn move the plungers of larger syringes in various instruments. These are usually designed for measuring and automatically dispensing larger volumes of various reagents and samples. Typically, these syringes use glass tubes with Teflon seals on their plungers. They require far greater forces to move, but since they're driven by the worm gear arrangement, the required forces are easily achieved. But the problem with those systems might be getting the timing to be precise.
I'd be tempted to go with the "free moving" types meant for autosampler injections.
As usual, your work, designs, and results are inspiring!
p.3 #18 · Flying projectile pass through a falling droplet.
Thanks JimH For all this super info! I understand the problem with the very high friction, especially into this insulin syringes, therefore i've used the very small versions of 40 units where the friction is much lower than the available force of the magnet with the reduction of 4 to 1. The biggest probleem was the needle self because of the very small inner diameter.
I've to inject this color pigments during a few msec but with the small needle this time elapse over a much longer time, to long for this application. But removing the needle let escape the droplet very quick. I've experience a small deviation in time but 50% of the records are oké. Ofcourse with the more professional versions it will be better.
For the stepper motor solution, I suppose the short injection time will be a problem.
Problem with all this setups is that once you have a few pictures, it's over and i'ts time to think about something new!
p.3 #19 · Flying projectile pass through a falling droplet.
chas wrote:
Is there a scientific basis for all of this, or just plain fun?
For me, just fun! But I'm very happy with nice photo's. But the most solutions need a good basis of knowlege of mechanics, electronics and all the rules of the photography.
p.3 #20 · Flying projectile pass through a falling droplet.
Today I updated my setup for waterfigures and splashes together. As you can see, a more complex setup! Here an overview:
This time 4 flashes are used together with the dropper unit, the wave generator unit for the waterfigures and the color injector. Flashes used are the 2x SB-80-DX, 1x SB800 and the good old vivitar 283 camera is the D200 F20, 1/200 sec, ISO200 and the macro lens is the Nikkor AFD200/4 micro.
I can say that's not easy at all to synchronize all this timings. A little change in viscosity change a part of the timers. But after a few hours I found the correct settings and could start the records.
Here a few examples:
After this records, the cleanup procedure take one hour!
