| 摘要 |
PURPOSE: An optic sensor is provided to measure physical quantities having high rejection of environmental noise with a retracing optical circuit. CONSTITUTION: An apparatus for the measurement of physical quantities, of the type using an optical transducer to transform the variations of a physical quantity or perturbation in a variation of the state of polarization of a polarized light beam, in which: the transducer (38; 48A; 58A; 68; 78) is inserted in an optical circuit (I), provided with polarizing beam-splitters (33A, 33B; 43A; 43B; 53A; 53B; 63A; 63B; 73A; 73B) for splitting the light beam in components having different state of polarization and to launch them along afirst optical path (A) and a second optical path (B), being different to each other, which are recombined in further polarizing beam-splitters (33A, 33B; 43A; 43B; 53A; 53B; 63A; 63B; 73A; 73B) arranged at the output of the optical circuit (I); at the output of the optical circuit (I) a reflector element (6; 16; 36; 76) is provided, that reflects the light beam backinto the optical circuit (I) with a different state of polarization.
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