A Xenon flash will cause the Raspberry Pi 2 to freeze • Hacker News Board

Re: A Xenon flash will cause the Raspberry Pi 2 to freeze

#131

Post by BuildTheRobots » Mon, Feb 09, 2015, 8:04 PM UTC

teddyh wrote: post #102

From The Devouring Fungus , Karla Jennings, 1990, chapter 10, The Monster Turns… and Falls to its Knees , p. 211: Another legendary debacle triggered by light hit at a highly publicized affair thrown by IBM, ironic considering that IBM is the master of the seamless image. D. E. Rosenheim, who helped develop the IBM 701, the first mass-produced modern commercial computer, recalled the famous faux pas, which occurred w…

Link for the lazy: http://en.wikipedia.org/wiki/Williams_tube

Note for the kids: Yes, that's right, it says CRT memory. That's the same Cathode Ray Tube as found in non-flat-panel TVs and monitors, except we're using it as a high speed storage device.

Ironically, the wikipedia page for Selectron tubes actually has more useful information on Williams tubes than it's article does... http://en.wikipedia.org/wiki/Selectron_tube

Re: A Xenon flash will cause the Raspberry Pi 2 to freeze

#132

Post by lotsofmangos » Tue, Feb 10, 2015, 1:33 AM UTC

djmips wrote: post #127

thrownaway2424 wrote: post #11

That comments thread contains a head-smacking quantity of ignorance. "Is it the light or the EM pulse?" What?

Wow there's a band of savages wielding heavy down voting hammers.

One of the many dangers of light commentary.

Re: A Xenon flash will cause the Raspberry Pi 2 to freeze

#133

Post by bluehex » Tue, Feb 10, 2015, 4:01 PM UTC

bluehex wrote: post #69

jayrhynas wrote: post #54

Earlier quoted context omitted.

The most recent post [1] seems to indicate that covering one of the chips with blu-tac prevents the freeze [1] http://www.raspberrypi.org/forums/viewtopic.php?f=28&t=99042...

I'm thinking of trying a more permanent fix with some Sugru[1] when my Pi 2 arrives. Their about says it's insulating and okay for electric repairs under 24 volts. [1] http://sugru.com/about

Maybe not such a good idea according to: http://sugru.com/questions/can-i-use-sugru-to-secure-shock-m...

Re: A Xenon flash will cause the Raspberry Pi 2 to freeze

#134

Post by lotsofmangos » Tue, Feb 10, 2015, 6:54 PM UTC

darkmighty wrote: post #36

lotsofmangos wrote: post #32

Earlier quoted context omitted.

RF stands for radio frequency, and defines a band of electromagnetic radiation, popularly known as light, that is on a continuum of frequencies that above RF pass through visible light and on towards gamma rays. In simple terms, whenever something possessing charge moves it generates an electromagnetic wave associated with the motion and at right angles to it. Visible light is generated by motions of electrons at an…

RF refers to specific frequencies of radiation, which are not popularly known as light at all. Radio is usually in the MHz range to a few GHz (10^6-10^9 Hz). Light starts a hundreds of Terahertz (10^14 Hz). The behavior is qualitatively different at usual scales due to quantum mechanical behavior (light is difficult to emit/absorb coherently -- it's more particle-like) at high frequencies. A photon striking a semicon…

Here's some quantum optics with microwaves : http://phys.org/news/2013-05-quantum-optics-microwaves.html

Even if there is no fundamental reason to believe that quantum theory would make a distinction between "microwave photons" and "optical photons", this demonstration puts this equivalence across a huge frequency range on a firm experimental footing. Moreover, the lower frequency of the microwave photons enabled a more complete characterization of the effect than has been able so far with optical photons, opening up new possibilities to characterize radiation sources. Finally, the new experiment highlights how quantum optical effects can be exploited in experiments with microwave sources, which may lead to practical applications of "microwave optics".

Re: A Xenon flash will cause the Raspberry Pi 2 to freeze

#135

Post by hueving » Wed, Feb 11, 2015, 4:20 AM UTC

TheSwordsman wrote: post #85

hueving wrote: post #82

Earlier quoted context omitted.

This is not the same thing. The cause is from the burst of light, not EM.

What if I told you that light is EM?

I would tell you that pretending there isn't an implied distinction for everyone involved in a modicum of applied science is as counterproductive as arguing about the editor chosen for a coding tutorial.