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LDC1612/1614 sensing range

Deepthi Nair
Prodigy 30 points
Other Parts Discussed in Thread: LDC1612

Hai all,

I am currently working on inductive sensors for longer sensing range and I came across LDC1612/1614 as a solution for the same.

But, while going through the datasheet I have a few queries:

1) what is the maximum sensing range possible w.r.t the sensor diameter. For ex., if the sensor diameter is 12mm, then what is the maximum sensing range achievable with LDC 1612 or LDC 1614.

2) whether the sensing distance measured is lateral measurement or axial measurement of the target material.

Regards,

Deepthi S. Nair.

  • 0
    TI__Mastermind 18470 points

    Hello Deepthi, 

    The maximum sensing range we recommend is 100% of the coil diameter. As the target moves farther away from the coil, the amount of inductance change will decrease. 

    This assumes axial sensing. For lateral sensing, keeping the target close to the sensor allows for the most shift to be seen for the target motion. 

    Best Regards, 

    Justin Beigel

  • 0 in reply to Justin Beigel
    Prodigy 30 points

    Hai Justin,

    Thanks for your quick reply. It was so helpful. I found a document on LDC selection and its mentioning as 200% of coil diameter for LDC 1614, is it with a two coil arrangement or single coil itself is enough?

    Further to your answer, the axial measurement mentioned  is the same as the following figure says?

    Thanks in advance....

    Regards,

    Deepthi S. Nair

  • +1 in reply to Deepthi Nair
    TI__Mastermind 18470 points

    Hello Deepthi, 

    That document refers to a single coil design. When sensing a target at 200% of the coil diameter, noise is a much greater concern for the measurement. Being able to consistently make measurements at that range requires more ideal conditions for the LDC and is not possible in in all applications so we typically recommend 100% of the coil diameter for most applications. 

    Axial measurements are where the target moves closer or farther from the sensor coil as such: 

    Best Regards, 

    Justin Beigel

  • 0 in reply to Justin Beigel
    Prodigy 30 points

    Thanks Justin for the clarifications.