Abstract. Specifics of design of fiber-optic sensors used in gyroscopes for civil and military purposes are discussed. The specifics are reported to cause additional requirements for radiation sources: compliance with the wavelength of radiation of the nominal wavelength of the light guide, where the loss is minimal; sufficiently high efficiency of the input of radiation into the light guide; the possibility of a radiation source operation in continuous mode without cooling; a sufficiently high level of the output power of the radiator; durability, reproducibility of characteristics, rigidity of the structure, as well as minimum dimensions, weight, power consumption and cost. Parameters of the sensor design that have the greatest impact on its sensitivity are considered. A block diagram of an inexpensive fiber-optic angular velocity sensor providing the specified technical parameters is proposed. The features of the block diagram components are considered, including the radiation source, connectors, polarizer, optical fiber, as well as design of the sensor coil, phase modulator, etc.

Keywords: Sagnac effect, fiber optic sensor, angular velocity, block diagram, component requirements

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