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DLPNIRNANOEVM: software modify if we want to change wavelength range of dlp spectrometer

Paul Chou
Prodigy 60 points
Part Number: DLPNIRNANOEVM

Hello,

There is a question of the DLP NIR Nano EVM develop would like to look for help.

The wavelength range is 900nm ~ 1700nm of current EVM model.

If we would like to change the wavelength range to maybe 1000 nm ~ 2000nm or 900nm ~2500nm.

For the firmware and software portion, what will need to modify based on current source code.

Assume the dlp speclib might be changed on both firmware / software (gui) side. 

We are look for some advise so that we can speed up the study.

Thanks,

Paul

  • 0
    TI__Mastermind 28005 points

    Paul,

    You may want to look at the nirScan Nano section of the DLP Pico Universal FAQ. In order to support different wavelength ranges, the optics of the device must be reconfigured. Please review below for more information:

    https://e2e.ti.com/support/dlp-products-group/dlp/f/dlp-products-forum/711696/faq-dlp-light-control---dlp-nirscan-and-nirscan-nano-faqs

    I hope this helps.
    Regards,

    Philippe

  • 0 in reply to Philippe Dollo
    Prodigy 60 points

    Hi Philippe,

    Thanks for the information, I'm keep going to study the detail of the docs.

    For the wavelength range issue, I found a definition in both dlp_speclib code & GUI site.

    Change the definition would report the spectrum output which looks like what I preferred. (Just for software view only)

    But the detail calculation and rule are still on study.

    I have one related question of the GUI scan configuration parameters would like to ask for some hints.

    The pixel width of the GUI scan selection could choose from 2.34, 3.51 .. to 60.89nm.

    Guess this may related to DMD pattern generated.

    From the GUI code, it was calculated by (max_wavelength - min_wavelength) / (854 * 0.8).

    I'm confusing about the magic number 0.8, any idea of this number comes from?

    Is there any suggestion or comment about this issue?

    Or any study suggestion of this related issue, thanks.

    Regards,

    Paul

  • 0 in reply to Paul Chou
    TI__Expert 3360 points

    Hi Paul,

    We will look into this further and get back to you within the next few days.

    Thank you,

    Chris

  • 0 in reply to Cody Smith
    TI__Mastermind 23070 points

    Hello Paul,

    I want to restate that the optical system needs to   redesigned to extend the range.  The wavelength range cant be changed just by firmware only.

    I recommend that  you reach out to our third-party partner InnoSpectra for a extended wavelength spectrometer options.

    http://www.inno-spectra.com/en/product_02

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    Prodigy 60 points

    Hi Vivek,

    We understand that optical system should be modified for this topic.

    We already did that since we have experience on traditional spectrometer.

    To verify the optical and mechanical modification, we have to modify the software/firmware to fit the changes.

    Just looks for some support to quickly catch the point of the software/firmware control system.

    And would like to figure out some calculation rule in software application that maybe or may not described in some TI documents.

    If there are some documents or reference of software/firmware detail, that will be grate for our study.

    By the way, thanks for provide the information of Inno-Spec.

    Regards,

    Paul

  • 0 in reply to Paul Chou
    TI__Mastermind 23070 points

    Hi Paul,

     The source code for the GUOI and spectrum library is available. They are the best source for the information. In addition, you may want ti refer to the application note on "Signal Chain Performance Optimizations in the TI DLP® Technology-Based Spectrometer".

    https://www.ti.com/lit/an/dlpa072/dlpa072.pdf

    regards,

    Vivek