Cosserat gyro-birefringence. An introduction to nonsymmetrical photoelasticity

Abstract. Mechanical couple stresses modify at a microscopic level optical properties of some materials so they can display gyro-birefringence phenomena. The Optical Cosserat medium is defined and optical rotation tensor relative to couple stress is introduced. The generalized tensor of the dielectric permittivity is written for the Cosserat medium. Split of the plane-polarized light wave on passing through the Cosserat medium is shown and rotation of the azimuth of polarization is expressed by components of the couple stress tensor

Physical interpretation of the Cosserat mechanics for a collection of atoms

In this work, the Cosserat medium is analyzes as a set of atoms. These atoms are under the action of a mechanical load. The statistical analysis is preceded by a description of a single atom using classical mechanics and quantum mechanics. The behavior of the atoms in the field generated by mechanical change of the interatomic distance is shown as a phenomenon which can explain the Cosserat mechanics in a continuum

Method of measurement of the pressure in hydraulic and pneumatic systems with laser beam application

W pracy opisano metodę bezkontaktowego pomiaru ciśnienia z zastosowaniem światła laserowego. Przedstawiono stosowane aktualnie rozwiązania dotyczące tego tematu. Podstawy teoretyczne proponowanej metody zaprezentowano w formie zależności pomiędzy obciążeniem i geometrycznym ugięciem okna pomiarowego, zależności optyki geometrycznej oraz prawa absorpcji światła. Przedstawiono wyniki badań testowych, potwierdzające możliwości stosowania metody. Wykazano konkurencyjność zaproponowanego rozwiązania względem innych tego typu urządzeń. Wskazano na możliwość adaptacji metody w różnych działach techniki.In the paper, non-contact method of measurement of the pressure with laser beam application is described. Actual solution associated with the topic is shown. Theoretical background of the introduced method is presented in the form of the formulae connecting load and geometrical deflection of the window, formula of the geometrical optics and law of the light absorption. Results of the experimental study confirm possibilities of presented method. Competitiveness of proposed method is demonstrated. Possibility of the application of the introduced method in different sections of the technique is presented

Cosserat gyro-birefringence. An introduction to nonsymmetrical photoelasticity

Abstract. Mechanical couple stresses modify at a microscopic level optical properties of some materials so they can display gyro-birefringence phenomena. The Optical Cosserat medium is defined and optical rotation tensor relative to couple stress is introduced. The generalized tensor of the dielectric permittivity is written for the Cosserat medium. Split of the plane-polarized light wave on passing through the Cosserat medium is shown and rotation of the azimuth of polarization is expressed by components of the couple stress tensor