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  • TI Thinks Resolved

DLPDLCR3310EVM: Interaction with and use in large magnetic fields

Prodigy 20 points

Replies: 4

Views: 44

Part Number: DLPDLCR3310EVM

My application requires the display device to be exposed to a magnetic field of up to 10000 gauss (1T) without damage and to operate in fields of close to 1000 gauss. Can you provide me with any information on the compatibility of the DMD and DLP devices and any guidance as to which devices might be more suitable?

Thank uou.

  • Hi Mark,

    I will discuss this with our team and get back to you soon.

    Regards,

    Mayank

  • In reply to Mayank Khandelwal:

    Hello Mark,

    Thank you for your patience.

     

    TI has a very limited experience with this application. It is very important that customers interested in pursuing an application where a strong magnetic field is present, should fully evaluate their product.

    There are no ferromagnetic materials on the DMD, the aluminum mirrors are paramagnetic. The force a magnetic field exerts on a paramagnetic material is several thousand times less than the forced caused by the same magnetic field on a ferromagnetic material. Thus, a typical low magnetic field does not have much of an effect on the mirrors. However, a strong magnetic field suggested by may have a noticeable effect because it is order of magnitude stronger.

     

    Once again, we recommend that you need to conduct your own experiment and study to understand the impact.

    regards,

    Vivek

  • In reply to Vivek Thakur:

    Thank you for your reply. While aluminum is not significantly paramagnetic, I’m concerned that notion of the mirrors in the  magnetic field will cause eddy currents in the mirrors which gives them significant inertia. Would you guess that tests in the field would be destructive to the motors? Is there a way to assess this beyond seeing when failure occurs?

  • In reply to Mark Cohen:

    Hello Mark,

    Agree eddy current could also be a concern. If there is any change in magnetic field or movement , it may also cause same problem at mechanical housing and circuit boards.

    In the field test,  please look for  permanent damage to DMD mirrors  i.e. stuck in on or off position. Please also compare the output image with and without magnetic filed.  If the inertia  is not too high, it may be slow down or interfere in switching mirrors which will result in either noise in the image.

    regards,

    Vivek

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