4D Technology PhaseCam Twyman-Green Interferometers

FEATURES

• Measure in Difficult Locations
• The compact optical design makes for a small measurement head, which is easy to position in tight spaces. The laser source can be coupled to the head via a fibre optic cable, which moves heat-generating elements away from the optics. The combined result: easy positioning in challenging locations.
• Measure Despite Vibration, Without Isolation
• With a dynamic PhaseCam interferometer, vibration isolation is not required. This advantage is particularly critical when measuring large optics, or when measuring over long paths, where isolation systems would be prohibitively expensive. The interferometer does not even need to be coupled to the test optic, further simplifying setup.
• Measure Without an Expensive Reference
• With a Fizeau interferometer,  expensive, high quality reference transmission (flat or spherical) optics are required. The Twyman-Green interferometer does not require this external reference optic.
• Operate Remotely
• Motorised control of all functions means that a PhaseCam Twyman-Green can be operated remotely in measurement towers, vacuum chambers, environmental chambers and other challenging locations.
• No Calibration Required
• With no mechanical phase-shifting as in a temporal interferometers, fewer parts, and no delicate high-voltage PZT actuators, a Twyman-Green PhaseCam is always accurate.
• High Resolution
• The inherently on-axis design of the Twyman-Green interferometer means high resolution and accuracy is built into PhaseCams.
• Measure Low Return Systems or Highly Reflective Surfaces
• Polarisation control lets you match the energy in the test and reference beam to optimise fringe contrast. This feature lets you significantly improve the measurement noise floor and vertical resolution. A wide range of test setup reflectivities can be supported, and excellent contrast can be achieved, even in low return setups.