interferometer
/ˌɪntərfəˈrɑmətər/
noun
- A scientific instrument that uses the interference of light waves to make very precise measurements, such as of distance, wavelength, or surface shape.
- Engineers employed an interferometer to check the flatness of the mirror for the telescope.
- In the physics lab, students set up an interferometer to observe the interference pattern of laser light.
- The astronomer used an interferometer to measure the diameter of a distant star.