Svarichevsky Mikhail - RSS feed Svarichevsky Mikhail - RSS feed en-us Tue, 10 Jun 2006 04:00:00 GMT Fri, 23 Aug 19 01:13:27 +0000 120 10 <![CDATA[Ytterbium pulse fiber laser at work]]> ]]> Sun, 28 Jul 19 10:54:20 +0000 <![CDATA[Ferrofluid fun]]>

Sat, 20 Jul 19 12:56:32 +0000
<![CDATA[Flying FPV - Beta85x]]>
It took me 3 years of sparse attempts to start flying FPV. Finally it looks like I got it. At some point my brain rewired RC controls to helicopter flying experience in Battlefield 3 and it all snapped into place. What finally pushed it over the edge was reducing rates, enabling AIR mode permanently and getting 5 batteries (on such tiny quadcopters each battery lasts only ~3 minutes).

I compiled some of the first FPV flight attempts on Beta85x with some after 30 minutes of flight time:

PS. This is my second FPV quadcopter. I was flying first one (ARRIS C250 V2) visually mostly, and it was completely wrecked beyond repair in less than 20 minutes of flight time. It makes this hobby the most expensive one, if you calculate per hour expenses
Fri, 05 Jul 19 09:00:28 +0000
<![CDATA[Oxy-hydrogen torch @2800°C]]>
Hydrogen flame at 2800°C melts glass like butter. Electrolyzer runs at 12V x 25A using 15% KOH electrolyte. Oxy-hydrogen gas is filtered through silica gel and fine air filter.

Flame of filtered and dried gas is nearly invisible (it emits light in invisible UV). Had to turn off the lights to take a photo:

Torch is modified to have 45° bend at the end using standard compressed air parts:

Electrolyzer with 25plates is configured for 12V operation for now (will switch to 48V later).

Update: Melting gold with it:
Mon, 24 Jun 19 01:00:14 +0000
<![CDATA[Observing SpaceX StarLink satellite group]]> I was able to observe and photograph Starlink satellite group. They are visible in binoculars (10x50, 18x50), fly in sequence - dozens and dozens of satellites. Too sad I started to observe them only 5 days after launch, by now they've spread quite far already on their orbit.

Shoots are made using A7III + Sigma 135mm@1.8 (1/30sec, ISO 20000). 6 frame average, skipping 2.

Here we can see 4 Starlink satellites:

Here we can see 2 Starlink satellites and another satellite at higher orbit and different inclination:
Wed, 29 May 19 23:36:10 +0000
<![CDATA[Ducks do fly!]]>
Here in Italy - ducks and swans do fly. But people say several years ago there were much more swans, probably they have flown away... Freedom comes with a price tag.

One can see these ducks learned a lot: how they increase angle of attack at landing to reduce landing speed, how they can land with or without thrust reversal (if they feel it's safe), how they neatly tuck in flippers in flight to reduce drag (reminds me of Boeing 737 landing gear)... They even have sharklets!

Tue, 14 May 19 23:18:22 +0000
<![CDATA[Olympus BX60 - my new metallurgical microscope]]> first metallurgical microscope from China. During these 7 years I was going the path of Japanese cybepunk manga - replacing it's body parts one-by-one to Olympus ones, until the only remaining original piece were body and illuminator (which caused most of remaining optical issues). But now it was time to replace remaining parts to Olympus and complete the transformation. Last year I started watching Olympus microscopes on eBay - until finally I found this Olympus BX60 from South Korea.

Shipping went flawless. Upon arrival I reassembled short arc lamp illuminator - I was afraid that pieces of foam could get inside, ignite and deposit dirt on optical surfaces after turn on. When I opened the illuminator - I haven't immediately noticed the lamp. But it was there - just fell out of the socked. I was lucky that it did not broke: this tiny arc lamp (Ushio USH 102-D) costs 100-160$+. After assembly and quick illuminator tuning - everything was fine. The only minor complication was that this microscope was used only for fluorescent observation, so all cubes were for fluorescence. I will have to buy regular, bright-field neutral cube separately.

Lenses were very good and useful, without scratches on the optical surfaces: UPlanApo 100x/1.35 Oil, UPlanApo 40x/1.0 Oil, UPlanApo 20x/0.7, UPlanApo 10x/0.4, UPlanApo 4x/0.16, PlanApo 1.25/0.04.

Quality comparison will still take some time, but I hope that soon readers and subscribers of my blog on microelectronics would be able to enjoy microchip photos with higher quality.

Mon, 22 Apr 19 00:07:12 +0000
<![CDATA[First tracked astrophoto : M42 - Orion Nebula]]>

Click to enlarge:]]>
Sun, 31 Mar 19 07:29:13 +0000
<![CDATA[Sunset and Sunrise]]>

Sun, 31 Mar 19 02:14:35 +0000
<![CDATA[WeMacro and focus stacking for macrophotography]]>
Microscopy often requires stitching large panoramas (and sometimes - focus stacking), astrophotography - require stacking multiple long-exposure photos to mitigate tracking errors, star saturation, improve sensor noise and shot yield rate, and finally - decent macrophotography is now only possible with focus stacking. And then there are timelapses (like this 145440-frame 50-day timelapse), and any action photography where you can easily make 10'000 shots per day (that's a good time to talk about film).

I remember when I got my first macro lens Sigma 105mm F2.8 (about 12 years ago, ~2007) - I was surprised to see it's maximum aperture of F45, which severely degrades image quality due to diffraction. And this crazy aperture was needed, and sometimes it was not enough: dependence "depth of focus↔diffraction limit" was a brick wall which was not allowing to shoot small but "deep" objects with high (or even barely good) resolution.

But now there is a cure, and it's getting widely available - motorized rails for focus stacking:

226 shots, 50µm camera shift after each photo using WeMacro rail.
Stitched in Helicon Focus (Pyramid, smoothing=1). Lens is Laowa 25mm F2.8@F4

One of original photos for comparison:
Tue, 12 Mar 19 23:23:19 +0000