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How can I use DLP4500NIR to get hyperspectral imaging?

user4427765
Prodigy 20 points
Other Parts Discussed in Thread: DLP4500NIR

How can I use DLP4500NIR to get hyperspectral imaging? I know you can split the light beam by diffraction grating, but how can you get every scene(including row�olumn) at each wavelength? As hyperspectra system(V10M, Specim, Oulu, Finland), the line scan mode was used, that is, each time the reflective light of every line of the scene (including several pixels on it) pass through the narrow slit, and then the light was split, and then the next line, and so on. As said in your fdocument �Columns of micromirrors are then used to select which wavelengths are directed onto a single element detector, and micromirror rows apply an attenuation factor.� What does the second sentence mean? How does the DMD work to get the whole scene of a special wavelength?

  • 0
    TI__Guru 54320 points

    Hello User,

    Welcome to the DLP Advanced Light Control section of the TI-E2E community.

    The information in the document you are referring to is for a spectrometer, in which all of the light from all of the on state mirrors go to a single detector.  Therefore if you use a grating to disperse the wavelengths across the DMD then columns represent wavelength.  If you turn on a column of mirrors all of that wavelength goes to the detector.  If you then turn off some of the mirrors in the column (i.e. this is what is meant by using rows), then less of the light from that column will reach the detector, attenuating the amount of the wavelength from that column.

    To make a hyperspectral imager you would need to get wavelength information for every pixel in the scene.  That would be a different architecture completely.

    This is an idea you will need to develop.  It is different from a simple spectrometer.

    Fizix

  • 0 in reply to Fizix
    Prodigy 20 points

    Hi Fizix,

    Thank you for your kind reply. As you mentioned DLP4500NIR is only a simple spectrometer. However, I hope to get a simple prototype to get hyperspectral images.

    Does TI have any prototype based on DMD which can achieve hyperspectral application, namely  the line scan mode ( spectrum information of pixels on a single line can be got at the same time such as  Specim system? If so with the help of an mobile platform, the line by line hyperspectral image can be acquired).

    Or how can TI's DMD be used to get a prctical hyperspectral image? Are there any basic consideration or support for the line scan application of hyperspectral imaging?

    Thank you.

    Wei

  • 0 in reply to user4427765
    TI__Guru 54320 points

    Hello Wei,

    I wish that we could say we have, but we have not built a prototype of a hyper-spectral imager.  While we are confident that such a system/architecture could be made.  We do not have anything written or published on such a system. Maybe you will be the first.