B&W-tech Spectrometer & 473 module: Setup+Mods+Info

[chloderic]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

Civitus, what do you want to do with the device ?

 

[paul1598419]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

The resolution for an 1800 l/mm grating is closer to 0.1nm than 1nm. In fact, the resolution with a 600 l/mm grating is a little better than 1nm in practice. I'd take those Science Surplus grating specs with a grain of salt. Unless their gratings are of subpar quality.

 

[chloderic]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

The resolution for an 1800 l/mm grating is closer to 0.1nm than 1nm. In fact, the resolution with a 600 l/mm grating is a little better than 1nm in practice. I'd take those Science Surplus grating specs with a grain of salt. Unless their gratings are of subpar quality.

They are talking about the resolution of the spectro, not of the grating. Because of the small dimensions of the optical bench and the resolution of the ccd with this gratings it is not more possible.

Pixel size: 14 μm ´ 200 μm (14 μm pitch)

 

[paul1598419]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

Ah, I see. The CCD is not state of the art either. I guess you get what you pay for.

 

[Civitus]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

Civitus, what do you want to do with the device ?

Chloderic,
I want to build a reflectance spectroscopy set up for my students. I need to go from 400 to almost 800nm, and i do not need a really good resolution, 1 or 3 nm are ok for such measurements.
really many thanks

 

[Civitus]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

Ah, I see. The CCD is not state of the art either. I guess you get what you pay for.

In fact the Avante Mini spectrometer is build on the same Sony ILX511, really very nice spectrometers and they cost more than 1400Euros !
of course, the electronic is ,,, the state of the art in the Avantes

 

[Civitus]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

They are talking about the resolution of the spectro, not of the grating. Because of the small dimensions of the optical bench and the resolution of the ccd with this gratings it is not more possible.

Pixel size: 14 μm ´ 200 μm (14 μm pitch)

Also, for the resolution, keep in minde that the slit also is very improtant, it is the grating, the slit and the banch that fixe the resolution

C

 

[paul1598419]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

This I knew. I ended up paying quite a lot for my Ocean Optics spectrometer. It has been a joy to me ever since I paid it off. :crackup:

 

[Civitus]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

This I knew. I ended up paying quite a lot for my Ocean Optics spectrometer. It has been a joy to me ever since I paid it off. :crackup:

Haa, in fact, does any one has measured the linewidth of the laser? if it has been used in sort of raman system, it has to be really narrowline laser.
what do you think?
C

 

[paul1598419]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

I know Singlemode Laser has diffraction grating tuned several of these single mode lasers to incredibly narrow linewidths and has displayed the spectrum of one. It is in the megahertz bandwidth, IIRC. Is that narrow enough for you?

 

[Civitus]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

I know Singlemode Laser has diffraction grating tuned several of these single mode lasers to incredibly narrow linewidths and has displayed the spectrum of one. It is in the megahertz bandwidth, IIRC. Is that narrow enough for you?

Do you mean that this laser is of a megahertz bandwidth?
if yes, it is what i need for my labwork, a laser should ne almost a monochromatic light
Thank you Paul

 

[paul1598419]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

Yep. He was in Berlin, but has moved to California now. I don't know if he is able to supply you with one, but he would be the one I would go to for a direct diode narrow linewidth laser. He TEC controls the temperature at 25* C and has about 6nm of freedom in tuning them. He was using them for atomic transitions of certain elements.

 

[chloderic]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

Haa, in fact, does any one has measured the linewidth of the laser? if it has been used in sort of raman system, it has to be really narrowline laser.
what do you think?
C

Hello, I have just read the term "Raman" with great interest.
Exactly the project, which I will implement hereby ...
I have already realized the first prototype of a Raman microscope for the identification of minerals.
Here I was very glad that the optical resolution of the spectroscope with the 1800 grating is about 1nm, because if you turn the grid counterclockwise and so the laser line on the array direction shorter wavelength, you can reach with this grid with the 200-250 nm band width quite more than 5000cm-1 stroke-shift.
(10000000 / 532nm) - (10000000 / (532nm + 250nm)) = 6009.27cm-1 or at 200nm bandwidth (10000000 / 532nm) - (10000000 / (532nm + 200nm)) = 5135.79cm-1.
I do not need the antistroke, because it is weaker and so about a mirror from the stroke.
You also save the expensive notch filter and can use a cheaper sharp-edge long-pass filter.

 

[chloderic]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

You need to send a command to read the Serial Number. I don't recall off hand which command. There is a document around with all the known commands. I would have to find it. Was about 12 Months ?... ago when I wrote the software.

I would expect the Serial number is read when Spectrum Studio initialises the Spectro as well. But unless you know what to look for you might not find it.

The Spectro has 2 operting modes. Bin mode and Ascii mode. Most of the settings are done in Ascii mode then it's switched to Binary mode which increses the transfer rate of the captured data by about 300%

Hello Mosc007, I found some VI (LabView) for B & W-Tek here:
https://forums.ni.com/ni/attachments/ni/170/587117/1/VER1.zip
While these are essentially intended for the USB versions though possibly you can use the polynomial functions in your program?

 

[chloderic]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

in an old document "Spectrometer Command Set for BTC110/BRC100/BRC110/BTC200" i found

Set Coefficients
Description: Set coefficients.
Wavelength=coef_0+coef_1*pixel+coef_2*pixel*pixel+coef_3*pixel*pixel*pixel
Command syntax: C n {DATA WORD}
Response: ACK or NAK

Examples: C 1 1.23E-5 ------ coef_0=1.23e-5
C 2 2.345e+2 ------ coef_1=2.34e+2
C 3 123 -------coef_2=12
C 4 12345E-10 -------coef_3=12345e-10

Notes: Specialty
Response of command (?C):
Char0-Char 12 Char13-Char 24 Char25-Char 36 Char 37-Char48 10 13
Char0 ---Char12: *.***E** --Coefficient a0
Char13---Char24: *.***E** --Coefficient a1
Char25---Char36: *.***E** --Coefficient a2
Char37---Char48: *.***E** --Coefficient a3

 

[jnrpop]

Re: B&Wtech 473nm unit / Spectrometer Mods & Info

So....not to through another spanner in the works, just removed the filter from my second unit, and it has a different optical coating....... :thinking:

J