1995
Autores
FERREIRA, LA; SANTOS, JL; FARAHI, F;
Publicação
TRENDS IN OPTICAL FIBRE METROLOGY AND STANDARDS
Abstract
1995
Autores
FERREIRA, LA; SANTOS, JL; FARAHI, F;
Publicação
APPLIED OPTICS
Abstract
Faraday rotator mirror elements have been used in a number of applications as compensators for induced birefringence in retracing paths. In interferometric systems, such as the fiber-optic Michelson interferometer, this approach proved to be useful in providing maximum fringe visibility and insensitivity to the polarization state of light injected into the interferometer. However, it is found that, when the characteristics of the fiber coupler depend on the polarization state of the input beam, the efficiency of the Faraday mirror elements is limited. Theoretical analysis and experimental results in support of this statement are presented.
1994
Autores
FERREIRA, LA; SANTOS, JL; FARAHI, F;
Publicação
TENTH INTERNATIONAL CONFERENCE ON OPTICAL FIBRE SENSORS
Abstract
1992
Autores
SANTOS, JL; LEITE, AP; JACKSON, DA;
Publicação
APPLIED OPTICS
Abstract
A detailed comparison between a low-finesse Fabry-Perot cavity and a typical two-beam interferometer is developed and checked experimentally. The consequences of approximating the true Fabry-Perot function by the two-beam function are evaluated for commonly used signal-processing schemes in order to quantify the final error introduced in various fiber sensing schemes employing this configuration.
1991
Autores
SANTOS, JL; JACKSON, DA;
Publicação
APPLIED OPTICS
Abstract
A reflective array of optical-fiber sensors multiplexed in time and with their status read using coherence sensing associated with directly modulated multimode laser-diode illumination is investigated. Sensor sensitivity as determined by primary noise sources is evaluated and numerical results are presented. The concept is demonstrated with two all-fiber Michelson interferometers and applied to the measurement of periodic and quasi-static parameters. It is shown that the effect of feedback light into the laser cavity on the level of the system noise floor is negligible, making unnecessary the use of source optical isolation.
1986
Autores
CABRAL, JMS; SANTOS, JL; COONEY, CL;
Publicação
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
Abstract
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