A Constructive Way to Reduce Additional Errors of Fiber-Optic Sensors

Sensors of physical quantities of stress-strain state monitoring systems are the primary sources reporting deformations of radiation-hazardous large structures. The accuracy of measurements using fiber-optic sensors of various physical quantities largely depends on the stability of the parameters of the fiber-optic cable. A fiber optic cable is a constructive combination of incoming and outgoing optical fibers arranged in a single cable product. The fiber-optic cable introduces a significant additional error in the measurement result, which is associated with a decrease in the light transmission of optical fibers during its bends. To eliminate this error, it is necessary to exclude accidental bends of the fiberoptic cable during measurement and during assembly, certification and testing of sensors due to rigid fastening. A constructive method is proposed for mutual compensation of errors caused by changes in the parameters of a fiber-optic cable and an LED when the ambient temperature changes.