PHYSICAL-MATHEMATICAL MODEL OF BENDING FIBER-OPTIC SENSOR OF FORCE

Abstract

There is presented a model of an explosion-proof, jam-resistant under conditions of high level electromagnetic fields fiber-optical sensor of tensile force on the basis of a fiber-optical transformer of movements in which a distinctive peculiarity is an application of loss changes in radiation spreading in sensitive elements as ring loops deformed elliptically of multi-mode fiber light-guides forming a bundle that allows using a diode as a radiation source installed without a special alignment device. It is defined that a peculiarity of bending fiber-optical transformers of movement of a successive-parallel type is that in separate areas of rings a radius of curvature increases at the expense of deformation and the losses of radiation in these areas decrease, and in other ones this radius decreases that results in the increase of losses of the radiation spreading by light-guides. Overall losses directed at radiation in light-guides increase lineally with the increase of movement. There is carried out a choice of the optimum number of rings of a sensitive element and a choice of “source-radiation receiver” for obtaining a linear calibration characteristic of the sensor. It is shown that varying the number of coils in the bending fiber-optical transformer it is possible to change a range of movements measured ind a form of calibration characteristic of a transformer.