File:One bubble memory track and loop.png
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One_bubble_memory_track_and_loop.png (800 × 500 pixels, file size: 87 KB, MIME type: image/png)
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Summary[edit]
DescriptionOne bubble memory track and loop.png |
This image shows one "complete loop" of a magnetic bubble memory, consisting of a length of "track" from the orthomagnetic sheet and a minimum of associated drive electronics: At the leftmost end of the track, a pair of coils act as an electromagnet, "launching" new bubbles. These bubbles propagate along the guide pattern track, and wind up at the pair of coils at the opposite end. These coils act as a "pick-up", in which an electrical pulse is formed when a bubble arrives, and this pulse can be read off the output terminal at the lower right-hand corner. The same pulse is amplified and "signal conditioned" in the green amplifier triangle symbole in the middle. During normal (read) operation, the switch to the left is set to lead the output from the amplifier circuit directly to the "bubble-launching" coils, thus re-creating the same series of bits as bubbles "running in circles". When new information is to be written into the memory, the switch i set to direct pulses received at the input terminal at the far left, into the "launcher" coils, thus entering a new "string" of bits in the form of bubbles. |
Date | |
Source | Self-made using the Persistence of Vision Raytracer |
Author | Søren Peo Pedersen |
Permission (Reusing this file) |
GFDL-self |
Licensing[edit]
I, the copyright holder of this work, hereby publish it under the following license:
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | ||
| ||
This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
POV-Ray code[edit]
Below is the code for rendering the above image using the Persistence of Vision Raytracer:
/*
================================================
Overview of the loop in a magnetic bubble memory
------------------------------------------------
Created by Søren Peo Pedersen - see my user page
at http://da.wikipedia.org/wiki/Bruger:Peo
================================================
*/
// Here follows the definition of the "broken-off" strip of orthomagnetic "track"
#declare R=seed(4); // Random generator for pattern of magnetic "bubbles"
#declare BubbleRow=union { // Generate the pattern of bubbles
#local Count=0;
#while (Count<10)
#if (rand(R)>.5) // Random generator determines present/absent bubble
cylinder {<.76*Count-3.4,0,0>,<.76*Count-3.4,1,0>,.2} // Draws a bubble
#end
#local Count=Count+1;
#end
}
#declare OffGuides=pigment { // Pigment outside the guide pattern
object {
BubbleRow
pigment {color rgb <1,1,1>} // South pole areas outside bubbles
pigment {color rgb <1,0,0>} // North pole areas inside bubbles
}
}
#declare OnGuides=pigment { // Pigment inside the guide pattern
object {
BubbleRow
pigment {color rgb .6} // South pole areas outside bubbles
pigment {color rgb <.6,0,0>} // North pole areas inside bubbles
}
}
#declare RowPattern=pigment { // Employ OnGuides and OffGuides patterns
object { // to render the combined arrangement of
union { // bubbles and guide patterns
#local Count=0;
#while (Count<10)
box {<-3.7+.76*Count,0,-.07>,<-3.3+.76*Count,1,.07>} // Horizontal part of "T"
box {<-3.57+.76*Count,0,-.37>,<-3.43+.76*Count,1,-.07>} // Vertical part of "T"
box {<-3.2+.76*Count,0,-.07>,<-3.06+.76*Count,1,.37>} // "I"
#local Count=Count+1;
#end
}
pigment {OffGuides}
pigment {OnGuides}
}
}
#include "functions.inc" // Needed for function "f_granite" below
isosurface { // Create the orthomagnetic "slab" with the jagged, "broken-off edges
function {-f_granite(.05*x,2,.05*z)*1+abs(z)-.5 } // Makes the jagged edges
contained_by { box {<-4,-.3,-4>,<4,.3,4>} } // The box shape that's "broken"
accuracy 0.0 max_gradient 4
pigment {
gradient y
pigment_map {
[0 color rgb <1,0,0>]
[1 RowPattern]
}
translate <0,-.5,0>
scale <1,.6001,1>
}
finish {ambient .5}
}
#declare Coil=merge { // Pair of coils, one above the other
#local Count=0; // Counting loop going
#while (Count<10) // from 0 thru 9
torus {.2,.03 translate <0,.06*Count+.33,0>} // A ring in upper coil
torus {.2,.03 translate <0,.06*Count-.84,0>} // A ring in lower coil
#local Count=Count+1;
#end
pigment {color rgb 0} // No color here, it's all in the reflection
finish {
metallic // Apply metallic effect
reflection rgb <1,.8,.6> // Reflects the characteristic copper-red
phong 1 // Specular highlights on
}
}
#object {Coil translate <-3.9,0,0>} // Electromagnet at left end
#object {Coil translate <3.9,0,0>} // Detection coil at right end
// Here follows the code for the circuitry "underneath" the orthomagnetic strip:
union {
cylinder {<4,-.5,0>,<4,-2.5,0>,.05} // Straight bit down from detection coil
cylinder {<4,-2.5,-.05>,<4,-2.5,.05>,.1} // Junction between amplifier and output
cylinder {<5,-2.5,-.05>,<5,-2.5,.05>,.2} // The output terminal
cylinder {<5,-2.5,0>,<-3.5,-2.5,0>,.05} // Straight through the green amplifier
cylinder {<-3.5,-2.5,-.05>,<-3.5,-2.5,.05>,.1} // Amplifier "side" in the switch
cylinder {<-4,-.5,0>,<-4,-1.3,0>,.05} // Straight bit down from electromagnet at left
cylinder {<-4,-1.3,-.05>,<-4,-1.3,.05>,.1} // Pivot point in read/write switch
union {
cylinder {0,<0,-.8,0>,.05} // The "arm" in the switch
intersection { // Arrohead at end of switch "arm"
box {<0,0,-.05>,<1,1,.05> rotate <0,0,45> scale <1,2,1> translate <0,-1.2,0>}
plane {<0,1,0,>,-.8}
}
//rotate <0,0,22.619865> // You can change sign on the 22.61... to flip the switch
translate <-4,-1.3,0> // Move switch arm into position
}
cylinder {<-4.5,-2.5,-.05>,<-4.5,-2.5,.05>,.1} // "New-data side" in the switch
cylinder {<-6,-2.5,0>,<-4.5,-2.5,0>,.05} // Entryway for new data from the input
cylinder {<-6,-2.5,-.05>,<-6,-2.5,.05>,.2} // The input terminal
pigment {color rgb .5} // Wiring is grey
finish {ambient .5}
}
prism { // The green triangular amplifier/conditioner circuit
linear_sweep linear_spline
-0.2,0.2,3,<1.5,-1>,<1.5,1>,<-1.5,0>
pigment {color rgb <.4,.8,0>}
finish {ambient .5}
rotate <90,0,0>
translate <.5,-2.5,0>
}
// Here follows the code for the blue arrows indicating the data "traffic" in the system:
#declare Arrow=merge { // Define an arrow...
difference { // The tip
box {<-1,0,-.001>,<0,1,.001> rotate <0,0,45> scale <4,1,1> translate <.4,0,0>}
plane {<1,0,0>,0}
translate <.1,0,0>
}
box {<-.5,-.03,-.001>,<.1,.03,.001>} // The "stem" of the arrow
pigment {color rgb <0,.5,1>} // Light blue color
finish {ambient .5}
no_shadow // Arrows cast no shadow on their surroundings
}
#object {Arrow translate <-2.5,1,0>} // Down along
#object {Arrow translate <0,1,0>} // the magne-
#object {Arrow translate <2.5,1,0>} // tic track
#object {Arrow rotate <0,0,-90> translate <3.8,-1.6,0>} // Down below det. coil
#object {Arrow translate <4.8,-2.1,0>} // Right towards output terminal
#object {Arrow scale <-1,1,1> translate <2.8,-2.2,0>} // Left into amplifier triangle
#object {Arrow scale <-1,1,1> translate <-2.5,-2.2,0>} // Left out of the amplifier
#object {Arrow translate <-5,-2.2,0>} // Right in from the input terminal
#object {Arrow rotate <0,0,90> translate <-3.7,-1.5,0>} // Down below det. coil
background {color rgb 1} // White background
camera { // See everything ...
location <5,4,-7> // from this vantage point
look_at <1,-1.1,0> // looking towards this point
up <0,1,0> right <1.6,0,0> // Force 1:1.6 "landscape" aspect.
angle 52 // Tweak field-of-view to fit the motif
}
light_source { // Illumination from some distance
<-100,150,-120> // to the left of the scenario
color rgb 1
}
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 23:58, 5 July 2015 | 800 × 500 (87 KB) | Cmdrjameson (talk | contribs) | Compressed with pngout. Reduced by 56kB (39% decrease). | |
22:25, 13 December 2007 | 800 × 500 (143 KB) | Peo~commonswiki (talk | contribs) | {{Information |Description=This image shows one "complete loop" of a magnetic bubble memory, consisting of a length of "track" from the orthomagnetic sheet and a minimum of associated drive electronics: At the leftmost end of the track, a pair of coils ac |
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