| 摘要 |
A method of determining induced change of polarization state of light in a polarization element comprising transmitting unpolarized light from a light source at the one end of an optical transmitter waveguide means (21) t o polarizer means (31) at the other end; polarizing the unpolarized light by t he polarizer means (31); transmitting the polarized light through the polariza- tion element (41; 41A, 41B) using at least one reflective optical element; a n- alyzing the transmitted polarized light from the polarization element by an analyzer means (32); and transmitting he analysed polarized light from the one end of optical receiver waveguide means (22) to a light detector at the other end; wherein the unpolarized light polarized by the polarizer means (31); the polarized light analysed by he analyzer means (32), or both, are non-collimated; and the polarized light in the light path between the polari z- er means (31) and the analyzer means (32) is collected and reflected by at least one reflective imaging optical element (51) so that the analyzed light ex- its the analyzer means (32) from the same side as the unpolarized light ente rs the polarizer (31). Further, fiber optic sensor devices for determining induced change of polarization state of light in a polarization element, particularl y linear birefringence induced by electric voltage, electric field, and mechan i- cal force, and circular birefringence induced by electric current and magnet ic field.
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