75年4月,我们承担了双频激光干涉仪的研制任务。在下厂调研中我们了解到,在毛主席革命路线指引下,我国社会主义建设事业突飞猛进,迅速发展,许多大型、精密的机器设备相继诞生,过去的计量工具不是量测范围太小就是精度不够,已经远远不能满足生产的需要。双频激光干涉仪是一种新 In April 75, we undertook the research and development of dual-frequency laser interferometer. In the investigation of the factory, we learned that under the guidance of Chairman Mao’s revolutionary line, the cause of socialist construction in our country has progressed by leaps and bounds and developed rapidly. Many large-scale and sophisticated machinery and equipment have been born one after another. In the past, the measuring instruments were not too small in scope or of insufficient precision, Has been far unable to meet the needs of production. Dual-frequency laser interferometer is a new type