Experimental Modern and Quantum Physics for Do-It-Yourself Science Enthusiasts 

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Home Articles posted by David Prutchi (Page 2)
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DOLPi is a Hack-a-Day 2015 Semifinalist!

“From: no-reply-projects@hackaday.com Sent: Monday, August 24, 2015 9:39 AM To: david@… Subject: Your Project is a Semifinalist in the 2015 Hackaday Prize! Dear David Prutchi, Congratulations! We think your DOLPi – RasPi Polarization Camera is awesome and you are one of our top 100 picks for the Hackaday Prize. You are advancing to the next

 
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Hack-A-Day 2015 Prize DOLPi Submission Video

Hi! DOLPi is a low-cost polarization camera based on the Raspberry Pi. Like intensity and color, polarization is another property of a light wave. Humans cannot sense polarization, but many animals like cuttlefish and insects have polarization-sensitive vision that they use for navigation, finding water, and detecting transparent prey. This is DOLPi – it is

 
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DOLPi’s first pictures outside the lab

These are polarization images taken with DOLPi.  Colors represent Angle of Polarization  

 
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DOLPi – A Low-Cost RasPi-based Polarization Camera

DOLPi – A Low-Cost RasPi-based Polarization Camera A polarimetric imager to detect invisible pollutants, locate landmines, identify cancerous tissues, and maybe even observe cloaked UFOs! The polarization of light carries interesting information about our visual environment of which we are usually unaware. Some animals have evolved the capability to see polarization as a distinct characteristic

 
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$25 Philips Medical Systems PMTs from Sphere Research

Sphere Research is clearing out all the Philips PMT assemblies they have in stock to empty their expensive off-site rental storage space. While stock is available, you can order any PMT shown as a Philips Medical Systems assembly at the beginning of this page for only $25 +shipping: http://www.sphere.bc.ca/test/photo-tubes.html Simply identify the deal as coming

 
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Reader-Built e/m Measurement System Showcased on YouTube

Javier De Elias Cantalapiedra from Madrid, Spain posted the YouTube video above to show the e/m measurement system that he put together based on the description in our book.  His measurement system is based on Hoag’s method, and his nicely laid-out setup allowed him to obtain very nice results (4 to 6% error compared to

 
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According to Quantum Mechanics…

 

 
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Quantum Mechanical Effects in Microgravity

If there were any quantum effects to be seen, I wasn’t paying attention… Dorith (Mrs. diyPhysics) and I were having too much fun!    Click here for photos of Day 1 in the G Force One zero-g airplane Click here for photos of Day 2 in the G Force One zero-g airplane For more information about Zero G

 
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EG&G SPCM-AQR-13-FC Single Photon Counting Module on eBay (no relation to seller)

I HAVE NO RELATION TO SELLER – Just passing along in case someone is interested. eBay item number 271206242864: “The EG&G (or Perkin Elmer) SPCM-AQR is a self-contained module which detects single photons of light over the wavelength range from 400 nm to 1060 nm and sensitivity which often outperforms PMTs. The option 13-FC indicates

 
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Original Source for Flyback Driver Hack?

One of my all-time favorite circuits is the the following DC-to-AC inverter (click diagram to enlarge) based on an old color TV flyback:

 
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Fair Sampling Loophole Closed for Test of Violation of Bell’s Inequality

  A very interesting article by Bernhard Wittmann, Sven Ramelow, Fabian Steinlechner, Nathan K Langford, Nicolas Brunner, Howard M Wiseman, Rupert Ursin,and Anton Zeilinger, entitled “Loophole-free Einstein–Podolsky–Rosen experiment via quantum steering” appeared in the Nature’s New Journal of Physics, Volume 14, May 2012. This paper describes a Bell’s Inequality Violation experiment in which the “fair sampling”

 
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Loved the Book “How the Hippies Saved Physics” by David Kaiser

I just finished the book “How the Hippies Saved Physics” by David Kaiser and absolutely loved! The book was fun and immensely educational regarding the seemingly unlikely seed of modern-day quantum information theory.  I must confess that when I first saw the book on the shelf at my local Barnes & Noble I dismissed it as yet another

 
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Air to Ground Quantum Key Distribution Achieved

From Phys.org: “A team of German physicists has successfully demonstrated an ability to perform quantum key distribution (QKD) exchange between an airplane in flight and a ground station, paving the way perhaps to the same kinds of communications between satellites and ground stations which could lead to a global quantum based secure communications network. The

 
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Using Surplus Photonis XP2422/SN PMTs in Scintillation Probes

We prepared a short note on how to build a dynode voltage divider network for inexpensive surplus XP2422/SN photomultiplier tubes.  The XP2422/SN PMT is especially suited for gamma-ray spectral analysis when coupled to a NaI(Tl) scintillation crystal because of its high pulse-height resolution (PHR).  The XP2422/SN is available from Sphere Research in Canada.

 
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Schematics for Fast Pulse Amplifier for Macroscopic Entanglement Detection

A recent paper entitled “Displacing entanglement back and forth between the micro and macro domains” discusses the experimental possibility of displacing quantum entanglement into the domain where it involves two macroscopically distinct states, i.e. two states characterized by a large enough number of photons.  Specifically, the authors describe the process by which they start with two entangled spatially separated

 
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