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DLPNIRNANOEVM: About EVM wavelength range and how to change it

Saddam Heydarov
Prodigy 20 points
Part Number: DLPNIRNANOEVM
Other Parts Discussed in Thread: DLP2010NIR, TIDA-00554

Dear DLP support team,

I have checked the DMD used in DLPNIRNANOEVM and DLPNIRNANOEVM datasheet and saw that although the DMD has optimized wavelength between 700-2500nm, the EVM has optimized wavelength between 900-1700nm. 

Can I ask the reason behind this issue? 

I am working on a project where I have to analyze the spectral response of a chemical between around 700-2500nm. I also think that the InGaAs detector used in EVM can also operate upto sth near 1650nm.  

Do you have any recommendation on how to modify the optoelectronic part to change the wavelength range of EVM to 700-2500nm? Is it possible?

I found TI DLP EVM that can operate between 1350-2450 nm, but I am planning to target 700-2500nm range using single device. 

Thank you very much for your help in advance.

  • 0
    TI__Mastermind 28005 points

    Saddam,

    Welcome to the E2E forums, and thanks for your interest in our DLP technology.

    The DLP2010NIR DMD used in the NirScan Nano EVM supports a wider wavelength range than the EVM's implementation is able to provide. Let us inquire as to system limitations and get back to you within a few days. Thanks in advance for your patience.

    Regards,

    Philippe Dollo

  • 0
    TI__Intellectual 1415 points

    Saddam,

    Changing the wavelength range of the instrument would require redesigning the core optics and mechanics as noted in the final section 13 of this app note: http://www.ti.com/lit/dlpa062

    The reference design for this EVM including all mechanics and optical (Zemax) design files is located here: http://www.ti.com/tool/TIDA-00554 under 'Download Design Files' > 'TIDA-00554 CAD Files (Opto Mechanical) (Rev. A)'

    Please note that extending the range beyond a single octave of wavelengths (one octave would be 700-1400nm, or 1000-2000nm, for instance) would require additional filtering or other methods beyond what is done in our reference design to prevent adjacent orders of the grating from overlaying each other when imaged on the DMD.

  • 0 in reply to Eric Pruett
    Prodigy 20 points

    Eric,

    Thank you for your quick response.

    What about electronics side? If I modify optics and mechanics side, will the GUI and also EVM itself allow taking measurements between 700-2500nm range or they are limited to 900-1700nm range and we have to modify software source files of GUI and EVM?

    Thank you in advance.

    Regards,

    Saddam

  • 0 in reply to Saddam Heydarov
    TI__Genius 9971 points

    Hi Saddam,

    The GUI and embedded software of the EVM are limited to 900-1700nm. Yes, you will have to modify the source files to increase the wavelength range.

    Regards,

    Mayank

  • 0 in reply to Saddam Heydarov
    TI__Intellectual 1415 points

    Saddam,

    You will find the following two definitions in NNOCommandDefs.h:

    #define MIN_WAVELENGTH 900
    #define MAX_WAVELENGTH 1700
    These are used within the GUI code for guarding the wavelengths bounds which can be chosen when creating a scan configuration, as well as within the Tiva microcontroller code which checks scan configurations for validity before applying the configuration and setting up for the scan (int Scan_SetConfig(uScanConfig *pCfg) within scan.c). This was done for the purpose of making the software transition easier when moving to different wavelength ranges. Using this codebase with a different wavelength range has not been validated and tested though, so additional issues could arise.