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In this paper, a novel surface-enhanced Raman scattering (SERS) sensor combined with fused biconical taper fiber (FBTF) and
film coated with silver sols is proposed. This structure is designed to significantly increase the SERS active surface when
the length of the taper is increased and the radius is reduced, since the penetration depth is inversely proportional to the
taper radius and proportional to the taper length according to the fiber-optic evanescent-wave theory. Based on the SERS sensing
principle, the feasibility of FBTF sensor is analyzed in this paper. As a result, the Raman spectrum of R6G is obtained from
the fused biconical taper zone surface coating with the silver sols in our experiments. The detected concentration is up to
10−7mol/L. 相似文献
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In this paper, we present a simple and fast spectra inversion method to reconstruct the temperature distribution along single
fiber Bragg grating (FBG) temperature sensor. This is a fully distributed sensing method based on the simulated annealing
evolutionary (SAE) algorithm. Several modifications are made to improve the algorithm efficiency, including choosing the most
superior chromosome, setting up the boundary of every gene according to the density of resonance peaks of the reflection spectrum,
and dynamically modifying the boundary with the algorithm running. Numerical simulation results show that both the convergence
rate and the fluctuation are significantly improved. A high spatial temperature resolution of 0.25 mm has been achieved at
the time cost of 86 s. 相似文献
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A temperature sensor is demonstrated and fabricated by coating the single-mode tapered optical fiber with temperature-sensitive silicone rubber. It works on the change of the evanescent fields in the tapered optical fiber. Small changes in the refractive index of coating film greatly influence the power of evanescent fields, which modulate the transmission optical power in the waist region. The range of temperature measured is from 20°C to 70°C. The results show that the temperature sensor has high temperat... 相似文献
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A novel quantum dots (QDs) optical fiber amplifier was proposed and demonstrated. It was fabricated by dipcoating the PbSe
QDs doped sol onto the taper region of fiber coupler. The PbSe QDs was synthesized according to a colloidal method. A lower
refractive index sol was also synthesized as the host of PbSe QDs. A standard single mode fiber was used to make the fusion
tapered fiber coupler which had double input and output ports. With the simple structure, a signal and a pump can be injected
into the amplifier and excite the PbSe QDs through evanescent wave. The experimental results indicated that the amplified
light wave was observed at 1 550 nm wavelength with 980 nm wavelength laser diode as pump. 相似文献
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王廷云 《中国校外教育(理论)》2014,(31):179
常态化发展的大背景下,如何探索一条行之有效的常态化教育发展道路是新时期的研究主题。就此为切入点,提出积极推进学校内涵式发展这一话题,并从学校内涵式发展的界定,走内涵式发展道路的必要性以及走内涵式发展道路的实施途径三个维度,对此话题进行探讨。 相似文献
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