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液芯光纤可以使拉曼光谱强度提高103倍。研究了在stokes/anti stokes拉曼光谱强度比测温中如何获得理想测温结果的方法。用长为5.20m、内径为50μm的含C6H6和CCl4混合液体的液芯光纤,获得了高强度CCl4的±218cm-1,±314cm-1和±459cm-1的拉曼光谱。利用各光谱带的stokes与anti stokes的强度比(Is/Ia),确定了液芯光纤所在处的温度。实验结果表明,±459cm-1的强度比的实验值与理论值符合得很好,±218cm-1为较好,±314cm-1稍差一些。从理论和实验两方面总结了拉曼频移、光纤损耗、溶剂效应、仪器响应等对测温结果的影响。
Liquid core optical fiber Raman spectrum intensity can be increased 103 times. The method of how to obtain the ideal temperature measurement in the Raman spectrum intensity ratio measurement of stokes / anti stokes has been studied. Raman spectra of ± 218cm-1, ± 314cm-1 and ± 459cm-1 of high-intensity CCl4 were obtained using a liquid-core optical fiber having a length of 5.20m and an inner diameter of 50m containing a mixed liquid of C6H6 and CCl4. Using the ratio of the intensity of the stokes to the anti stokes in each spectral band (Is / Ia), the temperature of the liquid core optical fiber is determined. The experimental results show that the experimental value of the intensity ratio ± 459cm-1 is in good agreement with the theoretical value, ± 218cm-1 is better, ± 314cm-1 is slightly worse. The effects of Raman shift, fiber loss, solvent effect and instrument response on the temperature measurement results are summarized theoretically and experimentally.