Micro-nano optical fibre fluorescence sensor system based on evanescent field, and preparation method

Abstract

The invention relates to a micro-nano optical fibre fluorescence sensor system based on an evanescent field, and a preparation method, and can solve the technical problem that detection cannot be carried out due to the fact that the traditional fluorescence optical fibre sensor difficultly detects a fluorescence signal of a substance when the fluorescence signal emitted by the substance is weak orthe distance is relatively far. The micro-nano optical fibre fluorescence sensor system comprises a light source, a lens, an optical fibre, a photoelectric converter and a computer, and further comprises a micro-nano optical fibre; and the lens, the optical fibre, the micro-nano optical fibre, the optical fibre, the photoelectric converter and the computer are sequentially arranged after the light source, and sequentially connected. The optical structure in the invention is simple and compact; by utilization of the principle of sensitive detection of the evanescent field on the optical signal, a very weak fluorescence signal can be detected through the micro-nano optical fibre sensor system based on the evanescent field; and thus, high-sensitivity and far-distance weak fluorescence real-time analysis can be realized.

Description

Technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an evanescent field-based micro-nano optical fiber fluorescence sensor system and a preparation method. Background technique [0002] Fluorescence detection technology is a commonly used detection technology in biochemical detection and analysis. This technology uses the characteristics of certain substances to produce fluorescence after being excited for qualitative or quantitative analysis. Fluorescence detection has the advantages of high sensitivity and good selectivity. Fluorescence detection technology has been widely used in biological detection, biochemical analysis, analytical chemistry and other fields. There are two main ways to improve the sensitivity of the fluorescent optical fiber sensor. One is to increase the intensity of the generated fluorescent signal; the other is to increase the detection sensitivity of the fluorescent optical fiber sensor so that ...

AI Technical Summary

Problems solved by technology

[0004] A micro-nano optical fiber fluorescence sensor system and preparation method based on the evanescent field proposed by the present invention can solve the problem that when the fluorescent signal emitted by the substance is weak or the distance is far away, it is difficult for the traditional fluorescent optical fiber sensor to detect the fluorescent signal of the substance, resulting in failure Technical issues detected

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