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WEBENCH® Tools/LDC1001-Q1: Air gap variation between metal target and sensing coil changes sensing coil inductance and oscillating frequency & amplitude

Part Number: LDC1001-Q1

Tool/software: WEBENCH® Design Tools

Hello All,

I am working on inductive sensor.

I noticed if i change the air gap distance between the metal target and sensor coil. the Inductance of the coil changes, frequency and voltage amplitude change in the oscillating signal changes too. Some time it exceeds the range of LDC IC range.

When the target is near to sensing coil ( Less air gap) the frequency of oscillating signal is high and voltage amplitude is low.

When the target is moved away ( More air gap) the frequency is reduced and voltage amplitude is increased.

Could anyone please explain the reason behind this occurrence in detail ?

thanks in advance

  • Hi Umesh,

    What you've described is the fundamental operation of inductive sensing. We have a lot of collateral that describes the physics of inductive sensing and why these changes occur. Please see the FAQ in my signature below. The collateral there, especially LDC Sensor Design, should answer all of your questions.

    Best Regards,