Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1994-09-27
1996-12-24
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
356350, 385 12, G01B 902, G02B 600
Patent
active
055877915
ABSTRACT:
The interferometric current sensor is for measuring an electrical current. It comprises a light source for generating a light beam; a single mode birefringent waveguide having a linear birefringence and a circular birefringence, the circular and linear birefringences having respectively given orders of magnitude, the order of magnitude of the circular birefringence being equal or higher than the order of magnitude of the linear birefringence, the waveguide having a first loop portion for encircling the electrical current; a beamsplitter having a first input port optically coupled to the light source, and second and third input/output ports optically coupled to ends of the waveguide for launching counter-propagating light beams into the respective ends of the waveguide and for receiving the counter-propagating light beams therefrom; and a pseudo-depolarizer optically coupled in series with the waveguide for converting each of the counter-propagating light beams into a predetermined ratio of useful counter-propagating light signals and useless counter-propagating light signals. It also comprises an optical detector optically coupled to the ends of the waveguide via the beamsplitter for detecting a light intensity, the light intensity is representative of the current.
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Belleville Claude
Caron Serge
Houle Alain C.
Thibault Pierre
Van Neste Richard
CITEQ
Merlino Amanda
Turner Samuel A.
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