The monochannel fiber optic sensors measuring accuracy depends on such destabilizing factors influence, such as light emitter power variations, different research surface reflecting and scattering properties, photoreceiver parameters alterations and light from external emitters. The suggested vibration measuring method and this method realized two-channel fiber optic sensor permits to set and control the rated gap between the research surface and the fiber optic guide roving face plane with 0.1 micrometer accuracy during the vibration measuring process in conditions of light source power variations to 50% relative to its rating value, the surface reflecting coefficient a few times alterations and if there are small misalignments of the fiber optic guides roving face plane. The linear displacement measuring method and the four-channel fiber optic sensor could even keep the form of the transfer function curve, which varies during the destabilized factors' influence. The measuring result doesn't depend on prevented factors influence. The operating range of such devices coincides with the operating range of the monochannel sensors and makes up to 0.5 - 2 mm. The functional test forming method, monochannel fiber optic sensor with three time steps measurements and three-channel fiber optic sensor characterized by not only destabilized factors independece of the outputs signal, but they also widen the sensor operating range from 10 mm to 20 mm which differs from the known monochannel fiber optic sensors operating range in ten times. The three elaborated methods are described. Schematic diagrams of these methods realized devices are shown and the main concerns of this methods and devices correlations are discussed.
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