用激光单频干涉条纹计数方法测量长度需要设置相应长度的导轨和具备适宜的测试环境。这里介绍的光学倍乘干涉原理是一种不需要长导轨的大长度测长技术。对测试环境要求不严,适宜在室外进行测量。这种方法可作为室外校验24m 因瓦(Invar)基线尺长光电测距仪,直接测试地壳微量变形及特种工程安装测试等的手段。 Using laser single frequency interference fringe counting method to measure the length need to set the corresponding length of the guide rail and have a suitable test environment. The principle of optical multiplication and interference introduced here is a long length measurement technique that does not require long guides. The test environment is not strict, suitable for outdoor measurements. This method can be used as an outdoor calibration 24m Invar baseline length photoelectric distance meter, direct testing of crustal deformation and special engineering installation test means.