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Interesting. What applications are you using it for? (If you are okay discussing it.) diy calipers? Active feedback to a more complex mechanical system? As part of an optical system? It would be interesting to hear how these are being used. Especially from someone experience using/building them.

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I was using it to build a dilatometer - an instrument for measuring thermal expansion curves of materials. Theoretically simple, in that you take a sample of something and measure how long it is while sweeping the temperature around. In practice, you need very stable ~um measurements and lots of care to make sure all other length changes around the sample cancel.

In the real-world, they're often used for precision gauging for in-process metrology.

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