Plasma resonant type optical fiber biosensor based on annular core wave guide
A biosensor and plasma technology, applied to instruments, scientific instruments, and material analysis through optical means, can solve the problems of difficult to obtain repeatable fiber core probes, low sensitivity and signal-to-noise ratio, small size and difficult production, etc. problems, to achieve the effects of stable and reliable test results, improved sensitivity, and convenient production
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[0024] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0025] figure 1 and figure 2 The structure of the ring-core optical fiber of the present invention is given, and the shape of the core is circular. It consists of a ring fiber core 1, a ring fiber outer cladding 2, and a ring fiber inner cladding 3; Figure 3-Figure 4 The structure of the optical fiber sensing probe of the present invention is given, and its composition includes a sensing metal film 4 , a reflecting metal film 5 , a transmission light 6 , and an interference region 7 .
[0026] to combine Figure 6 The structure of the reflective optical fiber SPR sensing system includes: the light emitted by the broadband light source 11 is coupled into the single-core optical fiber 8 through the three-port circulator 13, so that the light source and the detector are isolated and detected, and the single-core optical fiber 8 and the ring-core optical fiber 10...
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