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Old 03-28-2017, 02:32 AM #81
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Default Re: Killer deal on USB spectrometer! (update: legitimate!)

DDEN -
It would be nice to try another program but I suspect that the Ithing
does its own processing. I'd like to know.
HM


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Old 03-28-2017, 10:09 PM #82
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Default Re: Killer deal on USB spectrometer! (update: legitimate!)

Has anyone tested the accuracy over the entire visible spectrum?

I improvised a spectrometer with a portable spectroscope and a webcam, tried it out with the theremino software (same thing they use) and it was reasonable on the blue-green range (+-3nm), but way off on the reds (639nm on a HeNe, 700nm on a 685nm). I calibrated it with the default 436 and 546nm lines of a fluorescent lamp. I'm suspecting all it does is a linear fit using those two points, which will give incorrect results because the rainbow from a grating isn't linear at all.

I'm wondering if this also happens with their device.
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Old 03-28-2017, 10:49 PM #83
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Default Re: Killer deal on USB spectrometer! (update: legitimate!)

Quote:
Originally Posted by Atomicrox View Post
Has anyone tested the accuracy over the entire visible spectrum?

I improvised a spectrometer with a portable spectroscope and a webcam, tried it out with the theremino software (same thing they use) and it was reasonable on the blue-green range (+-3nm), but way off on the reds (639nm on a HeNe, 700nm on a 685nm). I calibrated it with the default 436 and 546nm lines of a fluorescent lamp. I'm suspecting all it does is a linear fit using those two points, which will give incorrect results because the rainbow from a grating isn't linear at all.

I'm wondering if this also happens with their device.
This is a question that has been puzzling me since I heard that these were calibrated using only two lines. I don't see that it is possible because, like you said, the spectrum from a diffraction grating is not at all linear. But, with only two lines, one can only get a linear relationship.
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Old 04-24-2017, 06:49 AM #84
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Default Re: Killer deal on USB spectrometer! (update: legitimate!)

I am back for more updates.
Yes, I was told that the plastic stuff is the slit, it is printed, it seems.
It is not a very good idea to shine the laser directly to the spectrometer. it is better to make it reflect on a wall or a paper and then analyse it.

We spent a very nice trimester with out student working on those spectrometers. They are very handy and educational (pedagogical)
they are really worth their price.
I hope that they will have some more upgraded spectrometers as they promized few months ago, but no one for now.

regards
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Old 04-24-2017, 12:40 PM #85
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Default Re: Killer deal on USB spectrometer! (update: legitimate!)

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Old 04-24-2017, 10:08 PM #86
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Default Re: Killer deal on USB spectrometer! (update: legitimate!)

Quote:
Originally Posted by Civitus View Post
I am back for more updates.
Yes, I was told that the plastic stuff is the slit, it is printed, it seems.
It is not a very good idea to shine the laser directly to the spectrometer. it is better to make it reflect on a wall or a paper and then analyse it.

We spent a very nice trimester with out student working on those spectrometers. They are very handy and educational (pedagogical)
they are really worth their price.
I hope that they will have some more upgraded spectrometers as they promized few months ago, but no one for now.

regards
Civitus, did you test the accuracy over the entire visible spectrum?

I improvised a spectrometer with a portable spectroscope and a webcam, tried it out with the theremino software (same thing they use) and it was reasonable on the blue-green range (+-3nm), but way off on the reds (639nm on a HeNe, 700nm on a 685nm). I calibrated it with the default 436 and 546nm lines of a fluorescent lamp. I'm suspecting all it does is a linear fit using those two points, which will give incorrect results because the rainbow from a grating isn't linear at all.

I'm wondering if this also happens with their device.
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405nm: NewWish (29.1mW avg|5mW rtd) | Dilda (81.5mW avg|200mW rtd) | 501B by Blord (633mW pk)
low 445nm: C6 from Survival Lasers (1351mW pk|1289mW avg|1100mW rtd)
high 450nm: NewWish (12.6mW pk|5mW rtd) | Dominator by Blord (3010mW pk|2779mW avg during 5min)
462nm: 501B by Atomic (1507mW avg)
473nm: BWB-10-OEM labby by CNI (10mW rtd)
~462-476nm "Tunablue" by Atomic (1.5W pk)
low 520nm: MXDL pen by DTR (31.6mW pk|28.8mW avg)
high 520nm: Laserlands (8mW avg)
532nm: NewWish (28.6mW pk|26.8mW avg|10mW rtd) | Dapper (30.3mW pk) | Classic (120.0mW pk|103.1mW avg|100mW rtd) | "The Green Box" by Atomic (176.7mW pk|140.0mW avg)
589nm: Spartan from Dragon Lasers (58.4mW pk|37mW avg|50mW rtd)
632.8nm: HeNe pointer by Atomic (0.68mW rtd)
635nm: NewWish (4.6mW avg|5mW rtd)
638nm: Classic from Lazerer (409.3mW pk|389.4mW avg|415mW rtd)
650nm: NewWish (10.6mW pk|5mW rtd) | Dilda (216.3mW avg|200mW rtd)
685nm: laser-in-a-box by Atomic (30.4mW pk|29.3mW avg) | 501B by Atomic (32.4mW avg)
780nm: module (2.7mW avg|5mW rtd)
808nm: Classic modded from a 532nm (162mW avg)
850nm: module (8.8mW avg|7mW rtd)
980nm: NewWish (81mW pk|5mW rtd) | 2nd line around 490nm

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