Fluorescence sensor

摘要

An optical system (7) presenting chromatic aberrations is placed in front of the outlet end of the excitation fiber optic and the inlet end of the reception fiber optic to simultaneously optimize a focussing of the excitation light on the target and receipt of the ray of fluorescence by the reception fiber optic. <??>The excitation fibre optic transmits an excitation light produced by a luminous source to excite the fluorescence of an appropriate target. It has an outlet end (32) with a certain optical axis and is fixed to a first support (1). The receptor fiber optic receives a ray of fluorescence emitted by the irradiated target. It has an inlet end (22) with an optical axis parallel to that of the outlet end of the excitation fibre optic and is fixed to the first support. The optical system is fixed to a second support (6) mounted to move relative to the first support to allow the separation or approach of the optical system to the optical fibres. The optical system is a lens with a refractive index gradient, decreasing from the excitation outlet optical axis to the reception inlet optical axis. The first support is a cylindrical section (11) with a central axis in which at least two transverse positions are made to receive the ends of the two optical fibres and hold them parallel to the axis of the cylinder. The second support has a base with a transverse opening in which the optical system is positioned. The base also has an annular wall designed to receive the cylindrical section of the first support by screwing together. The excitation optical fiber is placed along the central axis of the first support and a number of reception optical fibers are placed at equal distances around it. The optical fibers are fixed to the positions in the first support by gluing. The first support is made of metal.