干涉术由“干涉”一词派生而来，是用干涉现象测量光波长尺度的距离。在可见光波段，这个距离约为590urn或1／43000英寸。这是一种精密系统，其灵敏度惊人。环境中的任何振动、移动或热膨胀都可检测。迈克尔逊的早期实验可受1000英尺之外马路交通振动的影响。如用比可见光更短 Interferometry is derived from the term “interference,” which is the measurement of the distance between light-wavelength scales by means of interference phenomena. In the visible band, this distance is about 590urn or 1/43000 inches. This is a precision system with amazing sensitivity. Any vibration, movement or thermal expansion in the environment can be detected. Michelson’s early experiments can be affected by road traffic vibrations beyond 1000 feet. As with visible light shorter