Abstract
The paper presents the results of numerical simulation of the output optical signals of mechanoluminescent shock sensors. Such sensors operate on the principle of direct conversion of mechanical impact energy into optical radiation energy. The sensing element of such a sensor is a thin layer of phosphor enclosed between two transparent flexible polymer films. The mathematical model of the sensor is based on the process of excitation of the glow centers (activator atoms) in a strong electric field of a moving dislocation. The stress-strain state of the film sensing element under quasi-static uniaxial loading under the action of a single pressure pulse is considered. The analysis of constitutive equations for elasto-plastic deformations and the basic equations of the dynamic theory of dislocations. To calculate the deformation of the sensing element, a microscopic model of an isotropic elastic-plastic medium with hardening is used, according to which the plastic deformation is considered as a result of the movement and multiplication of dislocations, and the hardening is as a result of their partial locking due to the increased density.
Highlights
The effectiveness of various technical systems is largely determined by the operation of sensors that supply primary information about the state of the system itself and the external factors affecting it
To calculate the deformation of the sensing element, a microscopic model of an isotropic elastic-plastic medium with hardening is used, according to which the plastic deformation is considered as a result of the movement and multiplication of dislocations, and the hardening is as a result of their partial locking due to the increased density
Mechanoluminescent pressure sensors use in their work the phenomenon of luminescence of class A2B6 semiconductors that occurs during plastic deformation of semiconductor crystals
Summary
The effectiveness of various technical systems is largely determined by the operation of sensors that supply primary information about the state of the system itself and the external factors affecting it. Expanding the range of product application conditions imposes special requirements on the sensors for noise immunity to electromagnetic interference, speed, reliability, information content, selectivity, miniaturization and the possibility of integration into the product design [1,2,3,4]. Mechanoluminescent impulse pressure sensors meet many of the requirements Such sensors operate on the principle of direct conversion of the mechanical energy of elasticplastic deformation into the energy of optical radiation. The use of output light signals solves the problems of pairing sensors with fiber-optic communication lines and significantly increasing the noise immunity to electromagnetic interference, the absence of. Successful application of MLS is impossible without the development of physical and mathematical models, simulation mathematical modeling and verification of the adequacy of models through experimental studies of MLS prototypes
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