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

[diber]

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

You have an expensive taste to select your test samples ... I just used alcohol and acetone :beer:

Forgot to tell that you can probably use Spectrum Studio to calculate the transmittance on the fly: acquire your reference spectrum and the "Use Current Spectrum as Bright Level" (button with green arrow). Never tried it, but I am pretty sure it will work.

 

[diachi]

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

Guys, please avoid double/triple posting, it's frowned upon here. You can use the multi-quote button to reply to multiple people or the edit button to update your last post. :beer:

 

[chloderic]

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

Guys, please avoid double/triple posting, it's frowned upon here. You can use the multi-quote button to reply to multiple people or the edit button to update your last post. :beer:

thanks for that, but if i have to add multipe new attachents with different content, so i have to do that for new informations and to separate different levels of informations ?

Every attachment is individual, an has an other content.
in the first view they may be identical .... but .... no ... so it isnt.

oh i would like to edit it again, sorry , but the content is realy fine tuned, is the subtle difference to different or the devious of the theme discussed here?

 

[Agastar]

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

Yes, in principle, raman microscopy is possible with this device; but depending on what you expect in terms of results, additional retrofits such as eg. notchfilter or langpassfilter, laser line clean up filter and various optics such as cubebeamsplitter or ALPHA-Epsilon edge filter necessary for rayleigh rejection.

Yeah, after some more reading I realized that the my confusion was around the need to normalize it to wavenumber. My apologies for the ignorance of my previous posts lol. You can't scream NOOB any louder than that

I have a cubebeamsplitter but it is for 405nm and if I'm not mistaken, I'll need something for a higher wavelength so as to avoid fluorescence. I've seen some do it with a 532nm laser which looks promising.

I played around with my "for parts" unit and the laser definitely does not work but the spectrometer does respond to light input. I think my next goal is to perform the mods mentioned here for the spectrometer (baffles and filter) and then open up the device mounted on the front of the machine (model number BRP473) and see what optics it has in it. I'd like to see if that can be made to work as my Raman probe. I need to learn a bit more though before I think I can accomplish that.

My machines have the label with the C numbers on them and I'm using SpectrumStudio, Can those numbers be plugged right into the calibration menu or is there more math needed to get the numbers to plug in. If not, I'll round up some light sources and try my hand at the more manual approach mentioned here.

Thanks
John

 

[chloderic]

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

the last *. cvs record with beamsplitter 6 and highbandfilter in the spectroscope i have now converted in a *.RRUFF and here the result:
My diamond is a diamond ... , with so about 19cm-1 ramanshift it is about 0.56nm next to the theoretical source of 473 nm, which is indeed good, but not enough, since the shift is based on a significant factor. Has anybody an idea to work it out ?

 

[Agastar]

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

long time ago it was talked about the laser optics of this laser ... see here:

https://laserpointerforums.com/f40/b-w-tek-bwb-10-oem-473nm-10mw-53423.html

Thanks for the link. I'll have a read through it

 

[Agastar]

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

By the way, I designed a housing for the spectrometer in Fusion360 and 3D-printed it. Stand-offs are incorporated and short M3 screws screw straight in to hold the cover and the spectrometer (at least when printed on my printer). Reduces the fan-noise (glued some soft pads to the bottom to avoid the vibration noise), avoids light leaks (I had a small light leak after opening the spectro to remove the internal baffles) and makes it easier to handle.

If anyone is interested in the files, let me know and I will mail them (or if anybody can tell me how to attach for instance stl files, I will attach them here).

I would be interested in the stl files for sure

 

[chloderic]

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

Yeah, after some more reading I realized that the my confusion was around the need to normalize it to wavenumber. My apologies for the ignorance of my previous posts lol. You can't scream NOOB any louder than that

I have a cubebeamsplitter but it is for 405nm and if I'm not mistaken, I'll need something for a higher wavelength so as to avoid fluorescence. I've seen some do it with a 532nm laser which looks promising.

I played around with my "for parts" unit and the laser definitely does not work but the spectrometer does respond to light input. I think my next goal is to perform the mods mentioned here for the spectrometer (baffles and filter) and then open up the device mounted on the front of the machine (model number BRP473) and see what optics it has in it. I'd like to see if that can be made to work as my Raman probe. I need to learn a bit more though before I think I can accomplish that.

My machines have the label with the C numbers on them and I'm using SpectrumStudio, Can those numbers be plugged right into the calibration menu or is there more math needed to get the numbers to plug in. If not, I'll round up some light sources and try my hand at the more manual approach mentioned here.

Thanks
John

hello John, you're a bit of a perektionist as I am .... but why do you need ascii instead of digits as serial numbers ... e.g. 007 is also a nice serial number ...?

The part in front of the unit is the beamsplitter, you can use it when you ar using a laser with 473nm, or you have to cange the dicro. It has the function of your cube....

 

[chloderic]

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

By the way, I designed a housing for the spectrometer in Fusion360 and 3D-printed it. Stand-offs are incorporated and short M3 screws screw straight in to hold the cover and the spectrometer (at least when printed on my printer). Reduces the fan-noise (glued some soft pads to the bottom to avoid the vibration noise), avoids light leaks (I had a small light leak after opening the spectro to remove the internal baffles) and makes it easier to handle.

If anyone is interested in the files, let me know and I will mail them (or if anybody can tell me how to attach for instance stl files, I will attach them here).

now i have no 3D printer .... BUT ..... :wave: nice idea .... will have a look for it !

 

[Agastar]

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

hello John, you're a bit of a perektionist as I am .... but why do you need ascii instead of digits as serial numbers ... e.g. 007 is also a nice serial number ...?

The part in front of the unit is the beamsplitter, you can use it when you ar using a laser with 473nm, or you have to cange the dicro. It has the function of your cube....

LOL, yeah I am a bit of a perfectionist.

I see from some more recent posts that others are performing raman measurements with this unit as is. I guess I just need to play around with my working unit as is and get comfortable with it and it's limitations before I go start modding it lol.

I have 5 more units coming in from ebay so I can do different mods to different machines and run them side by side to see the different results they produce

 

[Agastar]

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

let us share your experience !!!

Yeah, for sure

 

[diber]

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

Agastar and chloderic, I have edited my post about the spectrometer housing to include the link to the stl files. Let me know in case the link does not work.

 

[Agastar]

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

Agastar and chloderic, I have edited my post about the spectrometer housing to include the link to the stl files. Let me know in case the link does not work.

The link worked perfectly, Thanks!

 

[Cyparagon]

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

I was wondering where they got the 1nm resolution when I thought it should be much better, but it just isn't.

"Resolution" can be a vague term here, and is probably the reason for you and others talking past each other. In my spectrometer, each pixel spans approximately 0.3nm, (and my span is ~915nm to ~320nm) so you could argue the resolution is 0.3nm. Another way to measure it is Full width at half maximum. Since each spectral line entering the device, even if it has a line width of zero, will inevitably excite more than one pixel; this value is always higher than the other "resolution" number you might quote. The narrowest emission detectable by the plot, in which case mine is 2nm.

Of course, the accuracy can be finer than this, since the center can move in increments of 0.3nm or less, (or perhaps much less, with interpolation.) Even though my spectral width is 2nm, every known source I've measured is no more than 0.5nm off, and most are within that 0.3nm.

That is to say, with my device, a 500nm spectral line of width 0.001nm is not distinguishable from a 500nm spectral line of width 1.5nm. And yet, a 500.0nm spectral line is easily distinguishable from a 500.5nm spectral line

How narrow is the USB2000 FWHM spectral width?

 

[chloderic]

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

Today i calibrated another spectrometer, at the end the different spectral-lines were less than 0.5 nm in the range.
The base is still very wide, so I have to focus the last focusmirror to the CCD sensor.

Because here too, the spectral appearance of a NE lamp (as with all other of these spectrometers) looked very similar but a little bit different to documents in the web,
i attached a corresponding zoomed spectrum here with line-identifer.
Possibly someone can use that for their own calibration to identify the NE-lines.

Sorry the added pic is not functioning, therefor only this thumb

 

[Agastar]

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

Today i calibrated another spectrometer, at the end the different spectral-lines were less than 0.5 nm in the range.
The base is still very wide, so I have to focus the last focusmirror to the CCD sensor.

Because here too, the spectral appearance of a NE lamp (as with all other of these spectrometers) looked very similar but a little bit different to documents in the web,
i attached a corresponding zoomed spectrum here with line-identifer.
Possibly someone can use that for their own calibration to identify the NE-lines.

Sorry the added pic is not functioning, therefor only this thumb

Thanks for posting that. Was that done with the baffles and/or the filter removed?

Also, when you sample the light source, are you putting the fiber optic cable right next to the bulb or do you measure the light reflecting off of a piece of paper or something similar? I know you don't want to do that with a laser but wasn't sure if it was ok for something weaker like a CFL bulb.

Thanks
John