Fibre-optic gyroscope

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Notion

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Science and technology

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What Wikipedia says

A fibre-optic gyroscope (FOG) senses changes in orientation using the Sagnac effect, thus performing the function of a mechanical gyroscope. However its principle of operation is instead based on the interference of light which has passed through a coil of optical fibre, which can be as long as 5 kilometres (3 mi).

Excerpt from the Wikipedia article “Fibre-optic gyroscope”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: D. mcfadden, CC BY-SA 3.0, via Wikimedia Commons.