The fiber optic Sagnac interferometer has a series of advantages that make it particularly well suited to many rotation sensing applications when compared to conventional rotation sensors. In addition, the fiber optic Sagnac interferometer may be used to support the sensing of acoustics, strain, temperature, and pressure in modes of operation that are optimized for low frequency or high frequency signatures. This type of interferometer may also be used to support instrumentation for spectrometers to characterize light sources and for fiber diagnostics. This paper provides an overview of these applications.
Eric Udd, Eric Udd,
"Applications Of The Fiber Optic Sagnac Interferometer", Proc. SPIE 0985, Fiber Optic and Laser Sensors VI, (1 February 1989); doi: 10.1117/12.948855; https://doi.org/10.1117/12.948855