Bi-conical tapered fiber evanescent wave coupling-based fiber Raman sensor detection device

Abstract

The invention relates to a bi-conical tapered fiber evanescent wave coupling-based fiber Raman sensor detection device, which comprises a monochromatic source and a high-sensitivity Raman spectrometer, wherein the monochromatic source sequentially passes through a polaroid sheet, a focusing lens, a fiber coupling platform and a fused biconical taper fiber to be connected to the high-sensitivity Raman spectrometer, and the fused biconical taper fiber is placed in a solution to be detected; and in a taper zone of the fused biconical taper fiber, evanescent waves excite the molecules, absorbed bya metal nanoparticle layer on the surface of the fiber, of the solution to be detected to enable the molecules of the solution to be detected to generate a Raman spectrum which is coupled back to thefiber through the taper zone of the fiber and transmitted to the high-sensitivity Raman spectrometer to detect the Raman spectrum of the solution to be detected. The device is simple in structure, high in anti-interference capacity, high in flexibility and is suitable to be used on various occasions such as online analysis, real-time detection and biopsy specimen analysis.

Description

Technical field: [0001] The invention relates to an optical fiber Raman sensing detection device based on the evanescent wave coupling effect of a fused biconical optical fiber, belonging to the technical field of optical fibers and sensors. Background technique: [0002] Compared with the existing detection technology, the main advantage of Raman spectroscopy is that it can obtain rich information about molecular vibration and molecular structure without any sampling pretreatment of the substance to be tested. However, under normal circumstances, due to the small Raman light scattering intensity of molecules or atoms, it is only 10 of the incident light. -10 , while overlapping with an intrinsically stronger fluorescent signal, limiting its potential applications. Until 1974, Fleischmann et al. discovered the Surface-enhanced Raman scattering (Surface-enhanced Raman scattering, SERS) effect for the first time. In 1977, Jeanmaire and Van Duyne studied the nature of this ph...

AI Technical Summary

Problems solved by technology

However, under normal circumstances, due to the small Raman light scattering intensity of molecules or atoms, it is only 10 of the incident light. -10 , while overlapping with an intrinsically stronger fluorescent signal, limiting its potential applications

Images