double beam interferometer meaning in English

双光束干涉仪
双光速干涉差

This thesis describes a all fiber optic accelerometer based on t - g double beam interferometer , the whole system include a coherent source whose wavelength is 1310nm , a flexural optic fiber disk act as sensing unit , photodetector , piezoelectric ceramic act as a phase modulator and signal processing circuit . the all fiber optic accelerometer described in the paper has many desirable engineering features which include : broad frequency response ; high sensitivity to measurands ; antielectromagnetic interference and small size
本课题研究的是一种基于泰曼-格林( t - g )双光束干涉仪原理的光纤加速度计，系统主要包括：中心波长为1 . 31 m的ld相干光源、起传感作用的光纤柔性盘、光探测器( pin ) 、相位调制用的压电陶瓷以及信号处理系统。