Forgot to add that I'm an "hasbeen" (70 y old) and a "newbee" in optics and spectrometry.I'm interested by reflectance spectrometry (measurement of pigment influence in soaps and cosmeteics).
Le vendredi 5 février 2016 12:33:49 UTC+1, Jacques Blanchart a écrit :I purchased the v3 spectrometer kit in order to refresh my knowledge in optics and spectrometry.My goal is to build a "lab" spectrometer with enhanced capabilities : sensitivity, spectrum range, etc."Lab" spectrometer means that it does not need to be portable (anyhow, less than 1 cubic meter !!! ;-)I'm looking for help in :- spectrometer design calculations : distance from camera to slit, grating choice...- adjustment possibilities : ajustment of slit position, camera, focus...- camera choieand so on.Anyone interested by thos project ?Or does this already exist ?ps : please apologize for my french-english dialect...--
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I just ordered a CCD and an el-cheapo arduino clone to do just that. Basic driver software is already available on the 'net.I am using a TCD1201D CCD device couples with an Arduino nano 3.0 unit. It communicates over a USB Serial connection.The device has 2048 photosites and can function slow enough for the Arduino to keep up with it.I will start off with a DVD grating and see where that gets me.I can document what I am doing as I go along but can't submit to design by commission. That said, I am always open to suggestions!My ulterior motive is to calibrate my monitor and prints. Don't know if that is too much of a stretch target but if it is it will be a fantastic learning experience.Dennis
Hi Peter, did you see my earlier post with links a few minutes ago?
Thanks, will! I burned one LED out almost instantly connecting it directly to 5v (empiricism ftw), so I'm inclined to actually be careful on overloading it in this case.
I think we can test this out and if it works, note that either trinket cariant works but that the 5v requires the extra resistor.
Thanks, all!
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I took a look at the LED schematics but those will kill the Digital port on your Arduino; guaranteed! Its only rated for something like 40mA peak and just 20mA typical! Great for a signal LED in a control panel, not so much for lighting anything.If you really want to keep the component count low I would use a MOSFET to switch the LED. It doesn't need a base resistor like a normal transistor would because it is voltage driven, not current driven. So for those of you who hate Ohm's law, that's got to be a plus.A cheap one that packs a lot of punch for LED projects is an IRFZ44N. I have one PWMming my aquarium LEDS as I type this; that's a lot of LEDs. It doesn't even get warm to the touch.I even found a beautiful (yes; really) description of this component on the net.If you want to combine the LED project with the CCD project you will need to go to an Arduino Micro board I think. It has excellent USB-HID (keyboard and so on) support. It has 2.5K RAM and runs at 16 MHz, small form factor like the trinket pro.Should be a breeze to implement the output as typing. I don't have the CCD at home yet but I could mock something up for testing to see if RAM usage will allow a fully buffered frame on that device with all the required drivers loaded....Combining the LED with the CCD is trivial as we can just switch it during CCD integration ("exposure") and use a timer to switch off (both) as needed.The site that was posted convinces me that this can be done without resorting to overkill hardware and the complexities of OSes and such.
Op vrijdag 5 februari 2016 12:33:49 UTC+1 schreef Jacques Blanchart:
I purchased the v3 spectrometer kit in order to refresh my knowledge in optics and spectrometry.My goal is to build a "lab" spectrometer with enhanced capabilities : sensitivity, spectrum range, etc."Lab" spectrometer means that it does not need to be portable (anyhow, less than 1 cubic meter !!! ;-)I'm looking for help in :- spectrometer design calculations : distance from camera to slit, grating choice...- adjustment possibilities : ajustment of slit position, camera, focus...- camera choieand so on.Anyone interested by thos project ?Or does this already exist ?ps : please apologize for my french-english dialect...
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