Search found 102 matches

by Luc
Sun Jun 16, 2024 8:49 am
Forum: OpenRAMAN
Topic: How to further improve the performance?
Replies: 1
Views: 48

Re: How to further improve the performance?

Hi, Yes -- I had to enable account verification due to the amazingly high number of spam we were receiving despite the various captcha... About resolution, it's a complex topic because you have to take into account: The limitation of the experiment itself. Peaks have a natural width and it's not pos...
by Luc
Wed May 22, 2024 10:08 am
Forum: OpenRAMAN
Topic: GPIO activated capture
Replies: 4
Views: 523

Re: GPIO activated capture

It's a bit more complicated because there is no mechanism inside the software to record spectra as they are triggered by the hardware. Changing the Trigger mode from Software to Hardware will block the acquisition until the trigger is received but you will have to start the acquisition process yours...
by Luc
Tue May 21, 2024 7:02 am
Forum: OpenRAMAN
Topic: GPIO activated capture
Replies: 4
Views: 523

Re: GPIO activated capture

Not with the software as it is, you would have to modify the source code. At the moment, it forces the camera into Software Trigger mode everytime you connect to the camera as part of the initialization process. However , there is a mechanism in the program to synchronize capture with other events. ...
by Luc
Mon May 13, 2024 7:28 am
Forum: OpenRAMAN
Topic: Get full raman signal
Replies: 5
Views: 1615

Re: Get full raman signal

That's good to know!

On the occasion, I will make a post about cameras performances & how to quantify them but I don't have a lot of cameras to test (only 3). I made a setup for cameras evaluation in the past so I already know exactly how to do it :)
by Luc
Tue Apr 30, 2024 3:40 pm
Forum: OpenRAMAN
Topic: Gas-phase Raman build?
Replies: 1
Views: 1505

Re: Gas-phase Raman build?

Not on my side unfortunately. I guess it would require some kind of optical cavity to concentrate the Raman emission. Something like this setup: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT9ra4782pDBjFQmml8JLqo00eWOoVDH9KM02CEkTCT&s No idea either on the alignment difficulty but I can...
by Luc
Wed Apr 24, 2024 4:15 pm
Forum: General
Topic: Thoughts on new spectrometer paper in HardwareX
Replies: 1
Views: 1869

Re: Thoughts on new spectrometer paper in HardwareX

I quickly went through the article and saw it's based on Hamamatsu C12880MA chip for actual spectroscopy. According to the datasheet, the resolution is limited to 12-15 nm so the largest difference would be there. It's difficult to judge on radiometric aspects without a detailed (and carefully perfo...
by Luc
Wed Apr 24, 2024 3:40 pm
Forum: OpenRAMAN
Topic: SpectrumAnalyzer New and/or Undocumented Feature DIscussion
Replies: 4
Views: 3348

Re: SpectrumAnalyzer New and/or Undocumented Feature DIscussion

Hello Andy,

Not yet unfortunately -- due to health issues mainly :-/ I'm just back today from another 2 weeks at the hospital. Since end of December I can only work part time and am late on schedule.
by Luc
Wed Apr 24, 2024 3:36 pm
Forum: OpenRAMAN
Topic: Get full raman signal
Replies: 5
Views: 1615

Re: Get full raman signal

Although it's a bit noisy we clearly identify isopropanol on your spectrum :)

What integration time did you use? With long exposures you should get a very clean curve like on the website. If not, it means alignment can be improved.

I recommend the 31S4M indeed :)
by Luc
Mon Apr 15, 2024 7:42 pm
Forum: OpenRAMAN
Topic: Get full raman signal
Replies: 5
Views: 1615

Re: Get full raman signal

Hi! Thanks for sharing these modifications :) From what I see in the propanol image, it does indeed look that you are getting a good Raman signal! It would be best to have an intensity plot to confirm and analyze the results, in particular the resolution that your laser is offering (a good tip is to...
by Luc
Wed Apr 03, 2024 8:36 am
Forum: OpenRAMAN
Topic: Is Raman emission a Lambertian Emitter?
Replies: 1
Views: 1011

Re: Is Raman emission a Lambertian Emitter?

This goes a bit out of my comfort zone but my understanding of the Raman effect is that it is a generalization of the Rayleigh scattering process by adding a polarization term which depends on the vibration of bonds, resulting in an heterodyne process between the photon frequency and the vibration f...