CNI Spectrometers

[hwang21]

Anyone know how good/how much CNI's spectro's cost? If it's not too high I'm sure there are a bunch of members here who want a spectrometer... me included any ideas anyone?

 

[Wolfman29]

Probably very expensive :\ My guess is >$800, at least.

 

[bloompyle]

That's a very low estimate. I'd be surprised if they were <$1500. CNI is very proud of their work.

 

[Wolfman29]

Yes, it is very low, I figured we may get a bit below four figures if we had a group buy.

 

[csshih]

I would be very surprised if their standard usb spectrometer were under 3K, not to mention their Raman Spectrometer system which I doubt would be under 6K..

You would not need a spectrometer with this sort of accuracy. Might as well get the surplus ones on ebay.

 

[Meatball]

^^This. A good spectrometer with any of the "must have" features built-in can't be made for much less.

 

[bloompyle]

I am in need one one that can measure <0.2nm resolution.

Meatball, hopefully someone from UNL can hook me up?

 

[ARG]

^ Just remember you need the accuracy to back up that resolution

 

[bloompyle]

Of course.

 

[csshih]

Of course.

And the budget. Good luck with that! :na:

 

[bloompyle]

Money's all relative

Can you PM me those websites for auctions? I didn't save them in time.

 

[icecruncher]

Several of us were looking at these a couple years ago.

Spectrometers - Science-Surplus

They are $500, but resolution is 1nm depending on the grating.

A couple people picked them up from ebay and tried calibrating themselves for about 1/2 that. But I haven't seen any with very good results that weren't calibrated by Science-Surplus.

So far it's best bang for the buck.

 

[bloompyle]

I've talked to ARG about his, but I never pulled the trigger on buying it.

Unfortunately my predicament is determining 609.07 and 609.6.

Though I may just get it metered by a specially calibrated high performance meter at the local university.

 

[MarioMaster]

I've talked to ARG about his, but I never pulled the trigger on buying it.

Unfortunately my predicament is determining 609.07 and 609.6.

Though I may just get it metered by a specially calibrated high performance meter at the local university.

That's the spectrometer I had at SELEM. I need to try finding a smaller input fiber for it to increase its resolving power.

Also I changed the internal grating to allow it to cover nearly the entire visible spectrum.

If you got one (a grating) with a much higher line count you could calibrate it to a small window within the 600nm range and give you much more accurate information.

Mine was not calibrated very well since I didn't know exactly what wavelengths I was getting from my argon.

 

[ARG]

Differentiating between 609.07nm and 609.6nm is not a problem, it's capable of more than that

My grating only covers the visible spectrum, so it's pretty good in terms of resolution.

 

[MarioMaster]

Differentiating between 609.07nm and 609.6nm is not a problem, it's capable of more than that

My grating only covers the visible spectrum, so it's pretty good in terms of resolution.

The problem I had with mine is that the lines were so close together the peaks combined into one slightly wider hump, so although it had a peak in the 609nm region the multiple HeNe lines were not distinguishable.

This should be doable though with a high line count grating though. You lose total nm span but you could easily get down to the hundredths of a nanometer.

I ordered my grating from edmund optics, it was about $80 all said and done.