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| nmz787_i1 | http://www.zdnet.com/article/intels-next-big-thing-knights-landing/ | 01:09 |
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| nmz787_i1 | sheena: they could have done better: http://www.zdnet.com/article/intels-next-big-thing-knights-landing/ | 01:12 |
| nmz787_i1 | sheena: I mean http://hackaday.com/2015/03/31/fail-of-the-week-easy-cheese-printer-says-no/ | 01:12 |
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| ButaTine | looks interesting: http://sourceforge.net/projects/visage-hci/ | 04:24 |
| chris_99 | i've used something exactly like that | 04:26 |
| chris_99 | or possibly that | 04:26 |
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| chris_99 | does anyone recall the openspectrometer website | 07:04 |
| chris_99 | of nmz787's | 07:04 |
| thundara | It was linked as http://www.openspectrometer.com/ on the github repo ( https://github.com/nmz787/open-spectrometer ) | 07:05 |
| thundara | But it looks like that's down now | 07:05 |
| chris_99 | ah cheers, i just rememebered he wrote some stuff up on HaD.io - http://hackaday.io/project/1342-open-spectrometer | 07:05 |
| CaptHindsight | was that the prism and webcam version? | 07:06 |
| chris_99 | it uses a toshiba linear chip | 07:06 |
| thundara | Did anyone ever build it? | 07:06 |
| chris_99 | i think he did build it | 07:06 |
| CaptHindsight | if built right it will work | 07:06 |
| chris_99 | i want to build something similar for doing NIR stuff to measure alcohol | 07:06 |
| CaptHindsight | what bandwidth? | 07:07 |
| chris_99 | http://www.hindawi.com/journals/jamc/2012/728128/ - i need around 900mm to around 1000n | 07:07 |
| chris_99 | *nm | 07:07 |
| paperbot | http://libgen.info/scimag/get.php?doi=10.1155%2F2012%2F728128 | 07:07 |
| chris_99 | so it's still a silicon chip | 07:07 |
| CaptHindsight | what's the story on a greed gene? | 07:09 |
| CaptHindsight | how much is nature vs nurture? | 07:09 |
| CaptHindsight | and can we get a virus to target it? | 07:09 |
| CaptHindsight | chris_99: http://www.hamamatsu.com/us/en/S11510-1106.html | 07:12 |
| chris_99 | that would still need a grating right? | 07:12 |
| chris_99 | i've seen the sony one those dudes, use for $13 | 07:12 |
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| CaptHindsight | you have to break up the light somehow | 07:13 |
| chris_99 | some have in-built gratings | 07:13 |
| CaptHindsight | depends on the linearity you want | 07:13 |
| CaptHindsight | will it work, yes, how well is another story | 07:13 |
| chris_99 | mm heh | 07:13 |
| chris_99 | i'd definitely attempt to calibrate it | 07:14 |
| chris_99 | too | 07:14 |
| kanzure | "Brain-wide analysis of electrophysiological diversity yields novel categorization of mammalian neuron types" http://jn.physiology.org/content/jn/early/2015/03/20/jn.00237.2015.full.pdf | 07:14 |
| kanzure | http://neuroelectro.org/ | 07:14 |
| kanzure | "The goal of the NeuroElectro Project is to extract information about the electrophysiological properties (e.g. resting membrane potentials and membrane time constants) of diverse neuron types from the existing literature and place it into a centralized database." | 07:14 |
| kanzure | https://www.youtube.com/watch?v=BucMrSUy0I8 | 07:15 |
| kanzure | .title http://www.neuroelectro.org/neuron/85/ | 07:16 |
| yoleaux | NeuroElectro :: Hippocampus CA1 pyramidal cell | 07:16 |
| kanzure | and then they link to software implementations of each cell type <3 | 07:17 |
| CaptHindsight | will they discover the A-Hole neuron? | 07:18 |
| kanzure | they are all asshole neurons | 07:19 |
| kanzure | every last one of them | 07:19 |
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| chris_99 | http://hackaday.com/2015/03/31/measure-as-little-as-you-want-with-openqcm/ | 07:32 |
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| chris_99 | blinking heck, diffraction gratings are expensive | 08:04 |
| archels | "Oral session on Omics" | 08:07 |
| archels | oh goodie, I can't wait | 08:07 |
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| nmz787_i1 | chris_99: if you don't want to compare your measurements to other spectrometers... linearity of the grating shouldn't really matter | 09:02 |
| nmz787_i1 | and in that case a cheap grating should work fine | 09:02 |
| chris_99 | oh, what grating did you use though btw? | 09:02 |
| chris_99 | i can't really find any cheap ones | 09:02 |
| nmz787_i1 | it makes more difference in the UV since plastics (cheap gratings) absorb UV | 09:02 |
| chris_99 | i was just looking at http://www.edmundoptics.co.uk/optics/gratings/near-ir-nir-reflective-gold-gratings/46080/ | 09:03 |
| nmz787_i1 | I have a chinese concave flat-field-corrected reflectance grating | 09:03 |
| chris_99 | oh, where did you get it from? | 09:03 |
| nmz787_i1 | any of the cheap $10 grating sheets should do the trick for you I htink | 09:03 |
| nmz787_i1 | aliexpress or alibaba | 09:03 |
| nmz787_i1 | I think you may have asked about FTIR yesterday, and I have an old FTIR machine that doesn't do much more than boot up and turn it's laser and voice-coil on | 09:04 |
| chris_99 | yeah i was looking at the hammatsu ftir mems stuff | 09:04 |
| chris_99 | but it seems like i can do it with shorter wave NIR | 09:05 |
| chris_99 | from that chinese paper | 09:05 |
| chris_99 | also i was wondering , i noticed you used a 16 bit ADC, could i use 24 bit or something, for more precision | 09:05 |
| chris_99 | or is that pointless for some reason | 09:06 |
| nmz787_i1 | yes, but the design of the board will need a lot more work | 09:06 |
| nmz787_i1 | otherwise the extra bits are useless | 09:06 |
| chris_99 | mm, i've used a 24 bit adc with a loadcell before, although that was only low sps | 09:06 |
| nmz787_i1 | also more data could mean less overall framerate (i had been targeting 60FPS) | 09:06 |
| chris_99 | ah framerate doesn't matter much for me | 09:06 |
| nmz787_i1 | the ADC needs to be at least 1 or 2MHz | 09:06 |
| nmz787_i1 | err, maybe it was 500 kHz | 09:07 |
| chris_99 | so did you have to use any lenses between the grating or infront of it btw? | 09:07 |
| nmz787_i1 | http://www.amazon.com/Diffraction-Grating-sheet-Linear-Inches/dp/B007G0J1RU/ref=sr_1_fkmr0_1?ie=UTF8&qid=1427818044&sr=8-1-fkmr0&keywords=transmission+grating+film | 09:07 |
| chris_99 | heh i've seen that | 09:07 |
| nmz787_i1 | that's the beauty of the flat-field-corrected grating, is that it is already curved so absorbs the function of lenses/mirrors | 09:08 |
| nmz787_i1 | but that's mainly to increase linearity of wavelength to pixel-spacing | 09:08 |
| chris_99 | ah ok, is there a gap though between the grating and your sensor | 09:08 |
| nmz787_i1 | so if you have some lasers to calibrate with, and don't want to compare to others (only compare now and then of your own measurements) then linearity becomes less important | 09:09 |
| nmz787_i1 | yep | 09:09 |
| chris_99 | how about http://www.alibaba.com/product-detail/High-diffraction-efficiency-diffraction-grating_60104576100.html | 09:11 |
| chris_99 | oh is http://www.alibaba.com/product-detail/high-diffraction-efficiency-blazed-concave-grating_60186045792.html the kind you meant | 09:12 |
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| kanzure | 09:13 <kanzure> i don't think anyone is stress testing keyboards appropriately | 09:14 |
| kanzure | 09:13 <kanzure> on one of my keyboards i estimate that i have put in at least 100 million keystrokes | 09:14 |
| kanzure | 09:14 <kanzure> 100 million keystrokes is only like 10k words per day for 5 years | 09:15 |
| kanzure | 09:14 <kanzure> keyboards should be stress tested to 5-10 billion keystrokes | 09:15 |
| kanzure | anyway, yet another keyboard is fallig apart on me | 09:15 |
| nmz787_i1 | chris_99: yeah... looking for the company i got mine from... can't login to alibaba here though (password store not with me) | 09:15 |
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| nmz787_i1 | but searching the email addresses I have, I found this article | 09:15 |
| nmz787_i1 | paperbot: http://rd.springer.com/article/10.1007%2Fs11801-008-7140-5 | 09:16 |
| nmz787_i1 | the company name was something -vac I think | 09:16 |
| chris_99 | did you use a mirror to reflect the diffraction pattern to the sensor, as that's what the folks in this paper seemed to do | 09:17 |
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| paperbot | http://diyhpl.us/~bryan/papers2/paperbot/9d9c463bf71393c6e817b133414b1f38.txt | 09:18 |
| chris_99 | ooh sweet just found a dude selling 5x sensors for $25 | 09:20 |
| chris_99 | inc. shipping | 09:20 |
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| chris_99 | http://www.aliexpress.com/item/Free-shipping-5pcs-TCD1304AP-TCD1304-CDIP22-Best-quality/1887814216.html | 10:05 |
| chris_99 | should anyone want some | 10:05 |
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| kanzure | http://pepijndevos.nl/2015/03/30/tcpoke-private-beta.html "TCPoke is my project that connects Game Boys over the internet to battle and trade with first and second generation Pokemon games. Today the last parts for the TCPoke shield arrived, enough parts to make 9 test boards. I plan to give these away to people who can contribute to the project." | 10:37 |
| kanzure | "The gist of it is that a Teensy puts the Game Boy in slave mode and forwards the data over USB HID to a Chrome App that uses WebRTC to transfer the data over the internet." | 10:38 |
| chris_99 | heh | 10:38 |
| kanzure | :/ | 10:38 |
| chris_99 | have you seen the things that convert the GB/NES output to HDMI | 10:39 |
| chris_99 | from the display memory | 10:39 |
| kanzure | no | 10:41 |
| kanzure | does it use webrtc? :\ | 10:41 |
| chris_99 | https://www.youtube.com/watch?v=QnQuBN3iYVA | 10:43 |
| chris_99 | no | 10:43 |
| kanzure | dea/bitcoin exhibit b http://i.imgur.com/FxxXma3.png | 10:44 |
| chris_99 | http://blog.kevtris.org/blogfiles/hdmi/hdmi_proto_4.JPG | 10:45 |
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| kanzure | https://www.techdirt.com/articles/20150330/13592030490/federal-agents-investigating-silk-road-accused-stealing-bitcoin-abusing-govt-power-issuing-fake-subpoenas.shtml | 11:18 |
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| heath | i need a smaller battery http://i.imgur.com/6BXF9oC.jpg | 11:54 |
| heath | need to open the tile and see what they are using | 11:54 |
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| nmz787_i1 | this seems pretty decent for windows (works and no apparent spyware) https://github.com/nixxquality/WebMConverter | 11:55 |
| heath | another comparison pic http://i.imgur.com/dYAqilC.jpg | 11:56 |
| nmz787_i1 | crazy to see spyware/malware infected stuff on sourceforge :( http://sourceforge.net/projects/camstudio/ | 11:56 |
| chris_99 | what is it heath | 11:57 |
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| chris_99 | there is source in that repo interestingly nmz787_i1 | 11:59 |
| heath | chris_99: it's just a bluetooth low energy board with a gigantic battery on it | 12:01 |
| chris_99 | aha | 12:01 |
| chris_99 | https://store.openqcm.com/ -- im just looking at this, it has a microfluidic cell in it so you could measure liquids extremely accurately | 12:02 |
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| nmz787_i1 | chris_99: the mercurial link? I just saw that | 12:07 |
| chris_99 | the one you said theres spyware in | 12:08 |
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| chris_99 | nmz787_i1, you probably didn't see the aliexpress link i posted before http://www.aliexpress.com/item/Free-shipping-5pcs-TCD1304AP-TCD1304-CDIP22-Best-quality/1887814216.html should you need lots more of those sensors | 12:15 |
| nmz787_i1 | :) I checked the logs | 12:26 |
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| nmz787_i1 | thanks | 12:26 |
| nmz787_i1 | need to get my spectrometer board soldered up finally.... especially now that I have something to compare directly with | 12:26 |
| chris_99 | do you use a mirror btw, with your grating? | 12:26 |
| nmz787_i1 | the class I was in from Jan til like 2 weeks ago stole all my time... and now i'm in the process of moving which has all my stuff packed or getting packed | 12:27 |
| nmz787_i1 | nah, that's the beauty of the concave flat-field corrected grating | 12:27 |
| chris_99 | i'm confused why they use on in that paper | 12:27 |
| chris_99 | then | 12:27 |
| nmz787_i1 | all the optical elements are combined into one element | 12:27 |
| chris_99 | and that is concave | 12:27 |
| chris_99 | too | 12:27 |
| nmz787_i1 | http://www.gratinglab.com/Information/Handbook/Handbook.aspx | 12:28 |
| nmz787_i1 | oh, wait a sec, that isn't digital copy | 12:28 |
| chris_99 | heh | 12:28 |
| nmz787_i1 | http://www.gratinglab.com/Information/Technical_Notes/TechNote3.aspx | 12:29 |
| nmz787_i1 | fig 2 is what I have | 12:29 |
| nmz787_i1 | and what is recommended for raman spectroscopy | 12:29 |
| nmz787_i1 | one of the methods recommended for raman at least | 12:29 |
| nmz787_i1 | something about the higher orders not interfering as much | 12:30 |
| chris_99 | ah just to make sure i understand the light hits the grating gets reflected and then hits the sensor | 12:30 |
| nmz787_i1 | looks like this is a printout of that site before they took down the manual contents http://www.cientificosaficionados.com/libros/Diffraction%20Grating%20Handbook.pdf | 12:30 |
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| nmz787_i1 | 'reflected' but called diffracted | 12:31 |
| chris_99 | see i always thought light passed through the diffraction grating | 12:31 |
| nmz787_i1 | they're sort of the same thing, but I think using one or the other depends on how complex the surface the light interacts with is | 12:31 |
| chris_99 | how come its sort of reflected in this instance | 12:31 |
| nmz787_i1 | reflective vs transmissive | 12:32 |
| chris_99 | ah | 12:32 |
| nmz787_i1 | transmissive can filter light | 12:32 |
| nmz787_i1 | usually a reflective prism is coated with a metal, so it's got a mirror like finish | 12:33 |
| chris_99 | ah so it's almost like theres a grating in front of a mirror | 12:33 |
| nmz787_i1 | but then you can combine them to make a grism | 12:33 |
| nmz787_i1 | :D | 12:33 |
| nmz787_i1 | .wik grism | 12:33 |
| yoleaux | "A grism (also called a grating prism) is a combination of a prism and grating arranged so that light at a chosen central wavelength passes straight through. The advantage of this arrangement is that one and the same camera can be used both for imaging (without the grism) and spectroscopy (with the grism) without having to be moved." — http://en.wikipedia.org/wiki/Grism | 12:33 |
| chris_99 | haha weird | 12:33 |
| nmz787_i1 | a grating is basically taking advantage of reflection, but then the spacing and texture adds more constructive/destructive wave effects | 12:34 |
| nmz787_i1 | while transmission is more like a complex lens | 12:35 |
| chris_99 | that makes sense, i'll look through the book you linked too | 12:35 |
| nmz787_i1 | still has the grating features, but instead of the light bouncing off at angles... it lenses at different angles | 12:35 |
| chris_99 | so that's essentially all you need, a sensor and a concave diffraction grating, no other lens stuff? | 12:36 |
| nmz787_i1 | I think for your case you don't need anything but a transmission grating that doesn't absorb NIR, and a sensor (webcam probably would work) | 12:37 |
| nmz787_i1 | then just watch your data for the peak/peaks that change with alcohol conc | 12:37 |
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| chris_99 | one thing i'm not sure about is the light source though | 12:38 |
| nmz787_i1 | the mirrors/lenses are only for linearity correction, and focus. If blurring is a problem then you would need some mirrors/lenses | 12:38 |
| nmz787_i1 | but you could always tune the focus so it's good enough at NIR, and blurs outside that range | 12:38 |
| nmz787_i1 | since you mainly care about NIR | 12:38 |
| chris_99 | ah yeah | 12:38 |
| chris_99 | they say 'The design relied on a tungsten lamp enhanced by light emitting diodes' | 12:38 |
| nmz787_i1 | heh | 12:39 |
| nmz787_i1 | yeah I'd think you could just use some LEDs | 12:39 |
| chris_99 | heh | 12:39 |
| chris_99 | yeah i guess i should start simple | 12:39 |
| nmz787_i1 | you'd need to take the IR filter off the webcam | 12:39 |
| nmz787_i1 | have you seen the PLOTS spectrometers? | 12:40 |
| chris_99 | nopey | 12:40 |
| nmz787_i1 | they aren't much from a scientific standpoint, but they get some results... the webcam they ship is almost junk IMO | 12:40 |
| chris_99 | isn't the problem with webcams, is they normally haver a bayer array | 12:40 |
| chris_99 | not b&w | 12:41 |
| nmz787_i1 | http://www.tech-led.com/product/nir-led/ | 12:41 |
| nmz787_i1 | yeah, that will just reduce your signal though... unless your signal is really really weak | 12:42 |
| chris_99 | true | 12:42 |
| chris_99 | are you linking to that led as something to calibrate with? | 12:42 |
| nmz787_i1 | calibrate or use for source light | 12:49 |
| nmz787_i1 | should give you an idea of common wavelengths | 12:49 |
| chris_99 | ah yeah, its a shame it's not a bit lower | 12:49 |
| nmz787_i1 | you'll find a lot more NIR LEDs than UV LEDs, and for a LOT LOT cheaper than UV | 12:50 |
| chris_99 | cool | 12:50 |
| chris_99 | i just had a look at some ADCs turns out the 24 bit fairly high SPS aren't too cheap | 12:50 |
| chris_99 | http://uk.farnell.com/webapp/wcs/stores/servlet/Search?catalogId=15001&langId=44&storeId=10151&categoryId=700000004355&st=adc&pageSize=25&showResults=true&pf=110121713,110177616,110187818,110202873 | 12:50 |
| nmz787_i1 | yeah and verifying the board works is a challenge... high-quality super-low-noise power supplies are not cheap at all... even with a battery you can see chemistry-related noise on a 24-bit ADC | 12:52 |
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| chris_99 | heh, interesting, not heard of noise like that | 12:54 |
| chris_99 | i imagine you'd need capacitors across each power line to each chip, and split analog/digital lines | 12:55 |
| nmz787_i1 | analog design is a lot to think about | 12:56 |
| nmz787_i1 | all simple stuff when it comes down to it | 12:56 |
| nmz787_i1 | but lots of simple stuff adds up to lots to keep in mind while designing | 12:56 |
| chris_99 | yeah | 12:56 |
| chris_99 | i need to buy art of electronics, as i dont' really have a good electronics book | 12:57 |
| chris_99 | atm | 12:57 |
| nmz787_i1 | they just released a new version, or announced that they're releasing a new one | 12:57 |
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| chris_99 | mmm they did indeed | 12:57 |
| nmz787_i1 | should be good/better... the older one is like a sleeping pill for me ;) | 12:57 |
| chris_99 | haha | 12:58 |
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| nmz787_i1 | this guy has good advice that seems to sum up most of what I read from other various sources | 12:58 |
| nmz787_i1 | http://www.hottconsultants.com/techtips/pcb-stack-up-1.html | 12:58 |
| nmz787_i1 | http://www.hottconsultants.com/tips.html | 12:58 |
| nmz787_i1 | i.e. this http://www.hottconsultants.com/techtips/split-gnd-plane.html | 12:59 |
| nmz787_i1 | essentially you have to think like an electron... they like going in straight lines, and if you make them do otherwise, they radiate | 13:00 |
| chris_99 | cheers they look good pages | 13:02 |
| chris_99 | i got the free book from http://www.emcfastpass.com/main/ | 13:03 |
| chris_99 | which i need to read through too | 13:03 |
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| FAMAS | run folding@home to help humanity in the medical sector | 13:58 |
| kanzure | that's not what you're doign | 14:06 |
| kanzure | nice try | 14:06 |
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| nmz787_i1 | http://www.crtsite.com/index.html | 14:48 |
| nmz787_i1 | .title | 14:48 |
| yoleaux | The Cathode Ray Tube site, scientific glassware. | 14:48 |
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| dpk | paperbot: http://dl.acm.org/citation.cfm?id=1412230 | 17:27 |
| paperbot | ConnectionError: HTTPConnectionPool(host='libgen.info', port=80): Max retries exceeded with url: /scimag/librarian/form.php (Caused by <class 'socket.error'>: [Errno 110] Connection timed out) (file "/usr/local/lib/python2.7/dist-packages/requests/adapters.py", line 375, in send) | 17:29 |
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| fenn | hmm some neat features here http://blendercam.blogspot.de/ | 18:41 |
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| kanzure | fenn: since reading the entirety of wikipedia is out of the question, how about just all of the first sentences? | 21:20 |
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| --- Log closed Wed Apr 01 00:00:39 2015 | ||
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