
It is presented a mathematical model for non-uniform long-period fiber gratings which is based on the Coupled-Mode Theory. The model has the capability of considering the case of a surrounding medium with a refractive index higher than that of the optical fiber cladding, which gives advantages in a number of applications. As an application of the model a new liquid level sensor is proposed and the results of its simulation are compared with experimental data.
long period fiber gratings; refractometry; liquid level sensors, длиннопериодные волоконно-оптические решетки; рефрактометрия; датчики уровня жидкости, довгоперіодні волоконно-оптичні решітки; рефрактометрія; сенсори рівня рідини
long period fiber gratings; refractometry; liquid level sensors, длиннопериодные волоконно-оптические решетки; рефрактометрия; датчики уровня жидкости, довгоперіодні волоконно-оптичні решітки; рефрактометрія; сенсори рівня рідини
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