Spectrum modulation encoding sensor system for remotely detecting a physical magnitude, and operating by reflection
AssigneeBertin & Cie
InventorMichel Lequime
Life of this patent
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Abstract
The invention relates to an optical sensor using spectrum modulation encoding and operating by reflection, the sensor is connected by an optical fiber (10) to a light source and to a demodulator, and it comprises a collimator lens (16), a first polarizer (18), a sensitive component (20) subjected to the physical magnitude to be measured, a second polarizer (32), and catadioptric reflection means (28) such as a corner of a cube. The sensor of the invention enables all of the light flux to be reinserted into the optical fiber (10) after passing through the sensor without any disturbance from interference phenomena.
Claims11
A system for remotely detecting a physical magnitude and operating by reflection, the system making use of the principle of encoding light by spectrum modulation, and comprising a source of incoherent light connected by an optical fiber to a sensor which has an optical axis and which comprises, successively on said optical axis, a collimator lens, a first polarizer, a birefringent sensitive component subjected to the physical magnitude to be measured, a second polarizer and a catadioptric reflection means, said catadioptric reflection means reflecting the light in a direction parallel to the direction of the incident light, the birefringent sensitive component having slow and fast axes, and the first and second polarizer having light-passing directions which are inclined relative to the said slow and fast axes of the birefringent sensitive component.
Dependencies are inferred from the claim text.