阐述了双频干涉仪的定位原理，以及在应用CPLD设计、制作其功能电路时遇到的问题和解决方案。
The positioning principle of double - wavelength interferometer, the problems met in designing and manufacturing of CPLD functional circuits and the solving methods are described in the paper.
双频激光干涉仪是应用广泛的精密测量仪器。
Dual-frequency laser interferometer is a widely used precision measurement instrument.
该装置以拍波合成的场强信号的节点为对准标志，以光路组合形成的双频激光干涉仪测量尾数部分。
The node is used as sampling flag and the beat-wave fringe fraction is measured with double frequency interferometer combined by optical components.
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