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Ben Krasnow
Works at Google [x]
Attended UCSB '05
Lives in Redwood City, CA
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Ben Krasnow

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Seek thermal imaging sensor in the scanning electron microscope. Pixel is 10 micron square.

This sensor is basically an array of temperature-sensitive resistors.  Each resistor is designed to absorb as much radiant heat as possible, and the heat (long and mid-wave IR) is focused by a silicon or germanium lens onto the array.  Hotter areas of the focused image heat up specific resistors, and their values are read out serially just like a normal image sensor.  The system is called a microbolometer.
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how can we realize a P-N junction of a transistor under that electron
microscope or x-ray?
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Ben Krasnow

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Here's a comparison of CD, DVD, and Blu-ray discs in a scanning electron microscope. Same scale for each.
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so amazing !!!!!
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New Public Art project alert: now on Kickstarter.

This project contains CNC cut wood and metal,  teensys, custom hardware, individually addressable LEDs, fiber optics, 3D printing and silicone castings and collaboration with 8 people.

Please help me out by backing, sharing, +1-ing, liking/RTing on the other networks and telling your friends about it!

https://www.kickstarter.com/projects/sophikravitz/ride-a-unicorn-at-burning-man-2015
Sophi is raising funds for Ride a Unicorn at Burning Man 2015 on Kickstarter! Loquacious and Lovely are 2 unicorns being created for the Burning Man festival in Black Rock City, NV, USA.
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Brazil-based artist duo Janiana Mello and Daniel Landini of Mello + Landini create tree-like installations with untwisted ropes fastened to the walls of galleries. Titled Ciclotramas, the artworks have gone through 17 different iterations since 2010, each involving some form of ropes that seem to
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Thanks for all of the shares!  I'm really glad everyone liked the phonograph needle gif.  I show how I captured it in this video.
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that's wonderful
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Inspired by David Galloway's "Square Wave from the summation of odd-integer harmonic frequencies", I made a spin-off based on the same code:

http://www.khanacademy.org/computer-programming/spin-off-of-david-galloways-square-wave-from-the-summation-of-odd-integer-harmonic-frequencies/5154727290208256

This version provides an alternative solution that "completes the square" (so to speak), by alternating the phases and directions of the waves, in such a way that the projection on the other (real/imaginary) axis is also a square wave.

Thanks David Galloway for sharing your code.

Original program:

https://www.khanacademy.org/computer-programming/square-wave-from-the-summation-of-odd-integer-harmonic-frequencies/5389081424166912
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Very nice animation, and very good illustration of the since waves. Funny, the movements looks almost organic... 
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Ben Krasnow

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Lenovo is basically bare-bones Android on relatively weak hardware, no bells or whistles. My 2 year old tablet feels "budgety" but definitely serviceable - it still works fine even if I've been torturing it as my main developer tablet for about a year. Something to look out for though; Lenovo doesn't seem to upgrade Android versions for existing devices (only patches); my tablet is still Android 4.2.

Of course, you can go through the hassle of rooting the device and install whatever you want on it, but it's pretty obvious that Lenovo wants you to buy new devices often.

IMHO, still better than Samsung considering the huge price difference. ;)
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The table came out great, and the video shows the construction steps really clearly. Nice work!
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I made these bookends by soaking a fibrous palm tree stump in epoxy, then shaping into boards and sanding flat.
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Search for "aerolux" on eBay to see more of these colorful novelty neon lamps.
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+bigclivedotcom Thanks. I suppose if you really wanted to have the lamps on all the time, you could just plug the lamp into a 120V travel adapter, after all.
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Electron microscope video of phonograph needle in an LP groove. About 1/400 actual speed. Captured via Tektronix MDO3000 oscilloscope.

This video was made via the "stop motion" animation technique.  I moved the LP by 50 microns at a time, and captured a frame after each move. The setup inside the microscope was made possible by the fact that there are two separate stages with their own motion controls. I fixed the needle to one stage and the LP to the other so that I could get both parts into the frame at a good angle.
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+Jacob Christ I was thinking data acquisition 
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Electron microscope image of a CDROM. Track spacing is 1.6um, and the pits are 500nm wide, 100nm deep.
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I have always seen the representation of the CD-ROM's pits but never a photo of the actual thing. Quite amazing photo of it. Nice to have an electron microscope at your disposal. Thanks for sharing this.
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In his circles
143 people
Have him in circles
6,327 people
Lindsay Watt's profile photo
Paul Dolezal's profile photo
James Phillips's profile photo
Roy Wickham's profile photo
Richard Vejvoda's profile photo
RK Unruly's profile photo
Holidays At's profile photo
Antoinette W. Young's profile photo
Alexander Demenshin's profile photo
Communities
4 communities
Education
  • UCSB '05
    mechanical engineering, 2003 - 2005
  • California Polytechnic State University
    mechanical engineering, 2001 - 2003
Basic Information
Gender
Male
Other names
Applied Science
Story
Tagline
Designer of electronic and mechanical systems
Introduction
I previously worked on Virtual Reality and other hardware at Valve.  I currently work at Google[x].

Prior to starting at Valve, I built computer peripherals such as keyboards, mice, and joysticks that were designed to be used inside MRI machines.  My company, Mag Design and Engineering, sold these devices directly to researchers at academic institutions who used them to publish scientific papers in peer-reviewed journals.

After work, I spend time on many different types of projects that usually involve circuit design, machining, material selection, and general fabrication/hacking.  My favorite place to be is my home workshop.

ben dot krasnow at gmail

http://www.youtube.com/user/bkraz333

http://www.linkedin.com/pub/ben-krasnow/4/6a9/679

http://www.twitter.com/BenKrasnow

Work
Occupation
Engineering
Employment
  • Google [x]
    Hardware Engineer, 2014 - present
  • Valve Corporation
    Mechanical and Electrical Engineer, 2011 - 2014
  • Mag Design and Engineering
    Owner, 2003 - 2011
  • Accelere, Inc.
    Sys Admin / Developer, 2005 - 2009
  • Stanford University
    Software Developer / Sys Admin, 1999 - 2001
  • UCSB Daily Nexus
    Science Editor, 2003 - 2005
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Redwood City, CA
Previously
Sunnyvale, CA - Goleta, CA - San Luis Obispo, CA - Bellevue, WA