| 1. | This scattered light is combined with the reference beam at the photo-detector.
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| 2. | The second and third beams are modified versions of the reference beam.
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| 3. | These methods measure the variations in interference with a reference beam.
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| 4. | The developed hologram is illuminated by a beam similar to the original reference beam.
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| 5. | It must match the original reference beam angle exactly.
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| 6. | To visualise this effect, the image and reference beams are combined on a video camera and recorded.
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| 7. | The detector alternates between measuring the sample beam and the reference beam in synchronism with the chopper.
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| 8. | A double path interferometer is one in which the reference beam and sample beam travel along divergent paths.
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| 9. | The transmission and the hole size are selected to balance the intensities of the test and reference beams.
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| 10. | When the developed plate is illuminated by the reference beam, the light transmitted through the plate, "'U "'
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