4D PhaseCam Twyman-Green interferometers are the industry standard for measuring concave primary and secondary mirrors. Vibration insensitivity enables measurements across long standoff distances without isolation.
Measuring meter-class spherical optics like astronomical telescopes and space telescopes can be difficult because large turbulent air cavities and the sheer size of the optics can make vibration isolation impossible. That’s where dynamic interferometers make metrology possible.
This video features 4D Technology’s Applications Engineer, Jared Wheeler in their demo lab… showing how a measurement of an optic that is widely separated, not vibration isolated and with turbulent air is easy, because the small, light PhaseCam laser interferometer is easy to align–even if the optic is not. PhaseCam is a Twyman-Green interferometer, which means that it’s light output is well-conserved in the process – providing a strong laser source for illumination and bright, high contrast interference fringe generation. Its operating range is meters from the instrument.
PhaseCam 6110 has a 6 megapixel imaging camera and high quality optics, allowing for excellent spatial resolution across the data set. Its dynamic, single-frame acquisition, using 4D Technology’s patented polarization technique means that acquisition speeds are only limited by exposure time, and are measured in microseconds. The Twyman-Green format makes the instrument ideal for measuring surface shape of spherical optics, of any size, and with highest precision.
To learn more about the PhaseCam and your application, please get in touch with our Technical Sales Manager, Dr. Luke Nicholls, by email below or call (01372) 378822.
