Hi Dalibor, Thanks. I'm surprised you cannot access the site, no issues here from multiple computers. Maybe try from the home page http://www.saltechips.com/ and clearing your cache. Please let us know if you are still having issues, there is a wealth of information on the site including equations, plots etc.
We have data for the first 7k minutes (6810 to be exact), but I would like to collect more before drawing any conclusions. The plan is to do curve fitting on the collected data points, thus suppressing noise and other artefacts. If you follow our theoretical working you will see that the light emitted is falling exponentially, so we expect the data points to fit such a curve: http://www.ibm.com/developerworks/rational/library/mar06/cantor/fig7.gif The sampling rate of the data published is currently slow (1 point per week). This Sunday is time for the second measurement. I will need to judge whether to increase or decrease the sample rate then. Yes, you are right on current affecting sputtering rate. Also the gas pressure and composition as well as the electrode material may I add. This is mentioned in the description and an empirical equation is given. However the method we are using is independant from these factors - we are just interested in the rate that the glass becomes darker. So the experiment can be repeated for different currents and tube constructions to optimise the tube and operating point. We are running it at about 4mA with a constant current sink. This makes the glow reach about 3/4 of the tube's length. In other words the tube is in the normal glow region and we are 1/4 away from abnormal glow. In the normal glow region increasing the current increases the area of cathode being covered by the glow. These conditions were selected to best replicate typical usage of this particular tube, thus giving the most accurate lifespan figure possible. How is website access now? Alex On Friday, November 22, 2013 2:16:00 PM UTC, Dalibor wrote: > > Hi Alex, > > this is pretty interesting! I cant access the website, it is probably > unavailable now, but the stream is clear! Do You have any graph how > the absorbance rise during that those 7000 minutes? > > Are You running it on specs current or on higher to make the process > faster? The sputtering is not directly proportional to current, so it > would be nice to have data for currents from datasheet.. > > Thanks! > > Dalibor > > 2013/11/22 AlexTsekenis <[email protected] <javascript:>>: > > It is my great pleasure to announce that the SHINE (SALTechips IN-13 > > Endurance) experiment is now online. > > > > For the first time since the Cold War era we are able to rigorously > measure > > the end of life of a nixie tube due to darkening of its glass envelope. > > We are super nixited as we can now accurately answer the frequent > question > > of the lifespan of a given nixie. > > > > The experimental method relies upon a theoretical basis and custom > precision > > instrumentation developed by SALTechips specifically for this purpose. > > In summary, we are monitoring the optical absorbance demonstrated by the > > envelope of the tube as cathode material is being deposited by > sputtering. > > The absorbance increases with time, thereby causing the tube to become > > dimmer. At some time a brightness threshold is reached which we treat as > the > > end of life of the tube. > > The method and experimental setup are described in detail here: > > http://www.saltechips.com/lab/<http://www.google.com/url?q=http%3A%2F%2Fwww.saltechips.com%2Flab%2F&sa=D&sntz=1&usg=AFQjCNFiq6tdXsuwG14NIcf0D9cU7SR_Og> > > > > This time we are measuring the IN-13 bargraph tube that is of immediate > > interest to us, although the tools and techniques can be used on most > glow > > discharge tubes. > > > > We anticipate the experiment that is currently in progress to take a > > while.Data is plotted live as it is collected and we also have a live > stream > > of the instrumentation screens available 24/7(follow link above or > directly > > here: > > http://www.ustream.tv/channel/from-the-salte-lab<http://www.google.com/url?q=http%3A%2F%2Fwww.ustream.tv%2Fchannel%2Ffrom-the-salte-lab&sa=D&sntz=1&usg=AFQjCNGNnvH3lWQY2W0dyMaDsL8Dsf_XvQ>). > > > These are the same > > screens we use to record data! Nearly 7000 minutes into the experiment > and > > we are already collecting valuable data. > > > > The future of this method is bright as it is applied to measure and > compare > > other nixie tubes! > > > > > > Alex > > > > > > > > -- > > You received this message because you are subscribed to the Google > Groups > > "neonixie-l" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to [email protected] <javascript:>. > > To post to this group, send an email to > > [email protected]<javascript:>. > > > To view this discussion on the web, visit > > > https://groups.google.com/d/msgid/neonixie-l/b16aa111-40c9-49f9-b6c5-f0a5b4a788a0%40googlegroups.com. > > > > For more options, visit https://groups.google.com/groups/opt_out. > > > > -- > Dalibor Farny > http://dalibor.farny.cz<http://www.google.com/url?q=http%3A%2F%2Fdalibor.farny.cz&sa=D&sntz=1&usg=AFQjCNG-__S7Noaap0E_69PHINvk1Ab8Mg> > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/732ecf75-a44a-4ffb-b877-9f3bfad6072b%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
