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LDC0851: Linear position or acceleration sensing

Goldy Rathore
Prodigy 20 points
Part Number: LDC0851

Tool/software:

Hi,

I want to sense acceleration of a subwoofer whose coil moves 2 inches peak to peak and was wondering whether TI has any inductive sensor or capacitive sensor or accelerometer to do it.

While accelerometer sensor can be attached to the coil and give direct acceleration, the other sensors may give position which can be converted to acceleration using op-amps.

Does TI have any sensor that can be used in this application?

I would appreciate your technical help.

Thanks and Warm Regards,

Goldy

Watercloud Technology

  • 0
    TI__Mastermind 43640 points

    Hi Goldy,

    I think you could consider inductive sensing for this application.  Something like the LDC131x(12 bit) or LDC161x(28 bit) devices could work.

    You could potentially evaluate two different configurations. 

    1. Measure the air gap between metal target and coil.  The coil should be parallel to the metal target.  Max range is typically about 1/2 the diameter of the coil, so keep this in mind when you determine how large the coil needs to be.  See figure 2-2 in the app note below.

    https://www.ti.com/lit/an/snoa930c/snoa930c.pdf 

    2. Use a linear coil, where the metal target moves along the linear coil.  This can work well, but will require close proximity between coil and metal target.  See the app note below.   

    https://www.ti.com/lit/an/snoa931a/snoa931a.pdf 

  • 0 in reply to Eddie LaCost
    Prodigy 20 points

    Thanks Eddie,

    TI has good chips for inductive sensing, I could go digital but I wanted to check whether there were any analog linear inductive sensing chips from TI? That would be better for me

    Thanks and Warm Regards,

    Goldy

  • 0 in reply to Goldy Rathore
    TI__Mastermind 43640 points

    Goldy,

    We do not have a typical inductive sensor with analog output, but it is something we are considering for a future device.

    We do have the LDC5072 device which has SIN/COSINE outputs, but it is a different architecture which uses excitation coil + sense coils.  You could potentially implement your application with this device, but it is a more complicated design when compared with the devices I mention above.