How can I control electromagnet current based on proximity?

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To control the current to an electromagnet based on the height of an object above it, measuring the height accurately is crucial. Light-based sensors can effectively achieve this without interfering with the levitation process. While infrared (IR) emitters and detectors are commonly used, other light-based methods may be more suitable for this application. Suggestions for sensor types and schematics are welcomed to enhance the design. Exploring various sensor options can lead to a more effective control system for the electromagnet.
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I'm looking for some examples/ideas on how to control the current to an electromagnet based on the height something is levitating above it.

Schematics would be nice, but even any ideas/sensor recommendations would be appreciated.
or any similar application, I've seen something does using an IR emitter/detector but that wouldn't be the best application for this.

Thanks,
 
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Why Not?

You are going to have to measure the height somehow and light is a good and relatively simple way to do that and it in no way disturbs the action
it does not Have to be IR.
Ray
 

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