The directions can be obtained by removing the quarter-wave plate and following the procedure for plane polarized light or by interpolation. 可將四分之一波片卸去，并按平面偏振光法或內插法來(lái)決定其主應力方向。
Among them, the novel common-path heterodyne interferometric system, which is built with a pair of quarter waveplates to improve the measurement sensitivity, is my original design. 其中改良式外差干涉術(shù)，為我們最新提出的量測方式，是在共光程外差干涉儀中，加入兩個(gè)四分之一波片，藉此增加我們量測折射率的靈敏度。
