许多测定量块长度的干涉测量法(例如,用 Fizeau,Ksters 或 Dowell 型双光束干涉仪装置),都是应用静态测量器和静态的干涉仪反射镜。测量过程中,由于使用光学补偿器使干涉仪两臂之间的光程差可恒定地保持有较小的变化。使用下述测量法,在测量过程中,Michelson 型双光束干涉仪的两臂之间的光程差会因一个干涉仪臂中的角隅棱镜作匀速 Many interferometric methods (such as Fizeau, Ksters, or Dowell dual-beam interferometer devices) that measure the length of a block employ static meters and static interferometer mirrors. During the measurement, the optical path length difference between the two arms of the interferometer can be kept relatively constant due to the use of the optical compensator. Using the following measurement method, the optical path difference between the two arms of the Michelson-type two-beam interferometer during the measurement will be uniform due to the corner cube in one interferometer arm