Aerospace Instrument-Making Annotation << Back Invariant to destabilizing factors multichannel fiber optic sensors N.I. Limanova The elaborated multichannel fiber optic sensors may be used for the vibration measurements by contactless way in the conditions of the explosive or fire danger, ambient illumination, at change in a few times of the reflection coefficient of a vibrating surface, in the conditions of light source power variations to 50 % concerning rating value at insignificant increase in an allowable error of measurements. The represented devices permit to set and control the rated gap between the research surface and the fiber optic sensors with 0,1 micrometer accuracy during the vibration measuring process. Measuring channels of described gauges are executed combined and represent uniform braid light pipe in which radiating and receiving fiber optical light pipes form at an end face of braid the concentric zones.