US 12,449,355 B2
Device for measuring the refractive index of a fluid
Jerome Le Perchec, Grenoble (FR)
Assigned to COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
Filed by COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
Filed on Dec. 17, 2024, as Appl. No. 18/984,964.
Claims priority of application No. 2314430 (FR), filed on Dec. 18, 2023.
Prior Publication US 2025/0198921 A1, Jun. 19, 2025
Int. Cl. G01N 21/41 (2006.01); G01N 21/45 (2006.01)
CPC G01N 21/4133 (2013.01) [G01N 21/45 (2013.01); G01N 2021/451 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A sensor, including:
a planar entry guide comprising a first exit face and a planar transmission exit guide comprising a second entry face,
a Fabry-Pérot cavity configured to accommodate a fluid, and delimited by the first exit face of the planar entry guide and by the second entry face of the planar transmission exit guide,
a planar reflection exit guide optically coupled to the planar entry guide by the Fabry-Pérot cavity, having an optical axis at the first face forming an acute opening angle with an optical axis at the first face of the planar entry guide,
the Fabry-Pérot cavity being arranged so that a normal to the first face constitutes a bisector of the opening angle.