phase contrast
Technical term in optics and microscopy; refers to a technique that converts phase shifts in light passing through a transparent specimen to brightness changes in the image.
位相差顕微鏡は透明な試料の観察に使われる。
A phase contrast microscope is used to observe transparent specimens.
phase-contrast microscope
Compound of 位相 (phase) and 差 (difference), referring to the difference in phase of light waves.