1. Michelson designed an instrument called the Michelson interferometer to accomplish this. 2. They are also used in optical parametric oscillators and some interferometers . 3. The wave character of matter can be exploited to build interferometers . 4. The first of these interferometers was the 20 foot Stellar Interferometer. 5. The first of these interferometers was the 20 foot Stellar Interferometer . 6. Twiss went on to help construct the Narrabri Stellar Intensity Interferometer . 7. The intensity interferometer measures interferometric visibilities like all other astronomical interferometers. 8. The intensity interferometer measures interferometric visibilities like all other astronomical interferometers . 9. The interferometer -measured angular diameter is 0.43 milliarcseconds. 10. Typical interferometer testing is done for flat and spherical optical elements.
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