A Fizeau interferometer is a laser interferometer configuration commonly used for measuring the surface shape and transmission quality of optics and optical-grade surfaces.
A Twyman-Green interferometer is a laser interferometer configuration used for measuring the surface shape and transmitted wavefront quality of optical components, assemblies, systems, and optical-grade mechanical surfaces.
See 4D Technology at SPIE Photonics West 2022
4D Technology will be attending SPIE Photonics West 2022 in San Francisco, California. The 4D Technology booth will display the AccuFiz D, PhaseCam, and NanoCam HD (while mounted on a robot!), all making measurements live on the show floor.