Coaxial ring-shaped exit light multi-wavelength fluorescence sensor

Abstract

This invention relates to the field of fluorescence photometric measurement technology in small optical analytical instruments and optical sensors, and particularly to a coaxial ring-shaped multi-wavelength fluorometer or fluorescence sensor. The invention provides a coaxial ring-shaped light source, consisting of a cylindrical light guide tube and a ring-shaped multi-wavelength LED array located at the bottom of the light guide tube. A fluorescence collecting lens, a set of filters, and a photodetector located within the light guide tube constitute the fluorescence detection unit. The emitted light from the designed light source forms a high-brightness, large-volume illumination region in the transparent medium near the transparent window. Simultaneously, the large-area fluorescence collecting lens significantly improves the fluorescence collection efficiency, thereby enhancing the sensitivity of the fluorescence sensor. Compared with existing multi-wavelength fluorescence sensors, the design of this invention features a simple optical path structure, high detection sensitivity, low manufacturing cost, and wide applicability.

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