Nowadays high-end accelerometers/gyros use fiber optic interferometers much more precisely than previously possible.[0][1] [0] https://www.nist.gov/news-events

Nowadays high-end accelerometers/gyros use fiber optic interferometers much more precisely than previously possible.[0][1] [0] https://www.nist.gov/news-events/news/2017/03/measuring-acceleration-light https://www.nist.gov/news-events/news/2017/03/measuring-acce... [1] https://en.wikipedia.org/wiki/Inertial_navigation_system#Fiber_optic_gyros_(FOG) https://en.wikipedia.org/wiki/Inertial_navigation_system#Fib...