摘要：一、引 言在气-液-固三相反应器的设计和应用中,反应器内各点的相合率是极为重要的参数.传统的局部相含率检测方法加射线法、电感法和摄影法都只能在特定的场合下使用,并明显存在着较大的缺陷.为此作者开发了具有单一结构的光纤微元探头,采用激光光源,并配以微计算机系统,用于测量三相流中各相的局部含率.实验证明它具有可靠、精确和高效的优点.

摘要：A high-precision wavelength controller is presented in this paper. It is necessary to find out the difference between the central wavelength of a tunable fiber Fabry-Perot (FFP) filter and that of the input laser, while the wavelength control-ler operates at the states of wavelength-scanning and wavelength-locking modes. Firstly, a dynamic simulation model of tunable FFP filter is established, and the dynamic characteristic of tunable FFP filter modulated by an alternating current (AC) signal is simulated. Then the measuring time at wavelength-scanning mode compared with the theory time is discussed, and this time difference shows the difference between the central wavelength of a tunable FFP filter and that of the input laser. At last, the effects on wavelength-locking precision of time delays, including the time delay of opened-loop circuit, the time constant of the closed-loop circuit and the intrinsic hysteresis of piezoelectric (PZT) element, are analyzed. A wavelength controller of tunable FFP filter is designed and prepared. The experimental results at wavelength-locking mode show that a high locking precision is obtained.

摘要：阐述了在航空发动机设计领域应用间隙测量技术的必要性及迫切性。着重介绍航空发动机几种叶尖间隙测量技术,对叶尖间隙测试技术的测量原理及应用范围进行了论述。

摘要：Y2002-63133-1223 0225680智能视觉传感器的理论设计=Theoretic design of asmart vision sensor[会,英]/Gao,H.M.& Chen,X.//2001 IEEE Canadian Conference on Electrical andComputer Engineering,Vol.2.—1223～1228(E)Y2002-63328-2033 0225681用无线传感器网络连通世界=Instrumenting the worldwith wireless sensor networks[会,英]/Estrin,D.&Girod,L.//The 200l IEEE International Conference onAcoustics,Speech,and Signal Processing Vol.Ⅳ ofⅥ.—2033～2036(HE)