用碘分子共振吸收滤波器精确测量水中的布里渊散射频移

Accurate Measurements of Brillouin Shift in Water by the Filters with Resonating Absorption of Iodine Molecules

提出了一种基于分子共振吸收滤波技术的水中布里渊散射频移的探测方法边缘探测方法。利用碘分子在水中的布里渊散射光谱范围内的两个对称的吸收峰 ,可以对光在水中的布里渊散射频移实现高精度的实时测量。对这一方法的原理进行了分析 ,给出了可用于实际测量的探测系统 ,并给出了用此系统得到的实验测量结果。还分析了测量系统的固有误差及测量灵敏度。结果表明 ,这一新方法与常规探测方法 (如扫描干涉仪法 )相比 ,具有实时性好、灵敏度高、测量精度高等突出的优点。

A method for measuring the Brillouin shift in water is investigated. It is based on the technique of the filters with resonant absorption of molecules. By using the two symmetric absorption peaks of iodine molecules within the frequency range of Brillouin scattering in water, accurate real-time measurement of Brillouin shift in water could be achieved. The principle of the technique is analyzed and a real system which can be used in practical applications is given. Also, the inherent errors and the sensitivity for measuring of the system are discussed. The experimental results using this method are given. It shows that this method has several advantages such as good real\|time measurement, high sensitivity, high precision compared to the classical technique such as using Fabry-Perot.