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为了测量丝绸的反射率分布曲线．我们设计并制作了一台双频微机控制的数字锁相检测系统．它以一台模数转换器配合一台微机完成二个频率的输入信号的锁相检测，具有造价低、线性好、对称性好、测试速度较愉，能使用不带自扫描装置的国产光电二极管陈列等特点．特别适合于双光路的光电测试系统．本文叙述了双频微机控制数字锁相检测的设计思想，分析了双频试的特有现象──窜扰的发生和消除，解决了在半个周期内采样次数不等而导致的输出不稳定问题．
In order to measure the silk’s reflectance distribution curve. We designed and produced a dual-frequency microcomputer-controlled digital phase lock detection system. It is an analog-digital converter with a microcomputer to complete the phase-locked two-phase input signal detection, with low cost, good linearity, good symmetry, the test speed more enjoyable, can be used without self-scanning device of domestic photoelectric Diode display and so on. Especially suitable for dual optical optoelectronic test system. This paper describes the design concept of digital PLL in dual-frequency microcomputer control, analyzes the unique phenomenon of double-frequency pilot, the occurrence and elimination of crosstalk, and solves the problem of output instability caused by the unequal number of samples in a half cycle.