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DLPNIRNANOEVM: DMD chip and optical path issues

chenglq
Prodigy 160 points
Part Number: DLPNIRNANOEVM
Other Parts Discussed in Thread: DLP2010, DLP2010NIR

Hello, I would like to confirm the following two questions:
1) Can the DMD chip DLP2010 used in near-infrared be replaced by other DMD chips? What are the advantages of DLP2010 compared to other DMDs when used in this near-infrared spectrometer kit?
2) We control the DMD micro mirror switch on the band of interest and refract the light to the photodiode for reception. So, where will other non interested band lights shine? Will uninterested light reflect and scatter in a narrow space, interfering with the optical path

  • 0
    TI__Genius 11565 points

    Hello User,

    Our team will look into your questions and get back to you by the end of next week. 

    Regards,

    Lori 

  • 0
    TI__Expert 3825 points

    Hello User,

    1) DLP2010NIR (700-2500nm) is meant for NIR illumination applications like spectroscopy. Note that DLP2010 is a different DMD used for display or light control application operating in visible spectrum. The DLP2010NIR is optimized for longer life while operating with NIR spectral range. 

    2)All the other non-interested bands(columns) will be reflected on to light absorber. Only the interested column will be reflected onto the detector in the EVM.


    Regards,

    Akhil

  • 0 in reply to Akhil Guntumadugu
    Prodigy 160 points

    My understanding of the first question mentioned above is that DMDs are all micro mirror arrays that reflect light, so they should be universal. Is my understanding correct?
    The second question mentioned above, according to what you said, light that you are not interested in will be reflected onto the absorber. For the spectrometer kit, does this absorber refer to a black structural component?

  • 0 in reply to chenglq
    TI__Mastermind 23070 points

    Hi,

    chenglq said:
    Can the DMD chip DLP2010 used in near-infrared be replaced by other DMD chips? What are the advantages of DLP2010 compared to other DMDs when used in this near-infrared spectrometer kit?

    The EVM optical components are designed to work with DFLP2010NIR DMD. You cannot replace it with other DMD.

    Moreover, DLP2010NIR DMD's windows is coated for NIR light, and the transmission efficiency will very low of a visible range DMD.

    chenglq said:
    The second question mentioned above, according to what you said, light that you are not interested in will be reflected onto the absorber. For the spectrometer kit, does this absorber refer to a black structural component?

    It is light form mirror which are in OFF state. Only light form ON state falls on sensor. The OFF-state light is steered away.

    regards,

    Vivek