Twyman-Green interferometer


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Twyman-Green interferometer

[′twī·mən ′grēn ‚in·tər·fə′räm·əd·ər]
(optics)
An interferometer similar to the Michelson interferometer except that it is illuminated with a point source of light instead of an extended source.
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The residual stress was evaluated by a home-made Twyman-Green interferometer. The surface roughness was determined by a Linnik microscopic interferometer.
We used a home-made Twyman-Green interferometer associated with the fast Fourier transform (FFT) method to measure the radius of curvature of substrate before and after thin film deposition [17,18].
Malacara, "Twyman-Green interferometer," in Optical Shop Testing, D.
Caption: Figure 1: Interferogram acquisition system with a Twyman-Green interferometer.
These meas-urements were carried out on calcium fluoride and barium fluoride using a combination of a unique ultra-violet polarimetry system and a unique ultraviolet Twyman-Green interferometer that was developed at NIST.