用液芯光纤研究stokes/anti-stokes拉曼强度比测温

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。

Study on temperature measurement by stokes/anti-stokes Raman intensity rations using liquid-core optical tiber

Liquid-core optical fiber can enhance Raman spectral intensity 10~3 times. By using liquid-core optical fiber, how to acquire exact temperature is found by the relation of the temperature to the stokes and anti-stokes Raman intensity ration (I_s/I_a) with the liquid -core optical fiber,which length is 5.20m, inside diameter is 50μm, the core liquid is the solution of C_6H_6 and CCl_4, high intensity Raman spectra of CCl_4, which frequency shift is ±218cm~(-1), ±314cm~(-1), ±459cm~(-1). From (I_s/I_a) is acquired, the local temperature of the liquid core optical fiber can be decided. The result of the experiment shows that the theory value and experiment result is consistent. The best is ±459cm~(-1), the better is ±218cm~(-1), and the ±314cm~(-1) is not good as the others. The influence of Raman frequency shift, optical fiber loss, solvent effect etc are analyzed.