مقياس تداخل فيزو
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مقياس تداخل فيزو Fizeau interferometer[1] هو مقياس مشابه لمقياس تداخل فابري-پيرو يحتوي كلاهما على سطحين عاكسين. بينما، في مقياس تداخل فيزو، نجد أن الانعكاس على سطحي الإنعكاس أقل من إجمالي الانعكاس (4-30%)، so that secondary reflections don't contribute greatly to the fringe contrast. An angled beam splitter captures the reference and measurement beams.
Fizeau interferometers are commonly used for measuring the shape of an optical surface: Typically, a fabricated lens or mirror is compared to a reference piece with the same shape or a flat. The reference piece is sometimes realized by a diffractive optical element, as this can be manufactured by lithographic methods, which inherently warrant for high precision.
يستخدم كذلك مقياس تداخل فيزو في مستشعرات الألياف البصرية لقياس الضغط، درجة الحرارة، الانفعال...الخ.
استخدم فيزو مقياس التداخل لقياس تأثير حركة الوسط على سرعة الضوء، كما يتضح من الشكل الثاني. الضوء المنعكس from the tilted beam splitter is made parallel using a lens and split by slits into two beams, which traverse a tube carrying water moving with velocity v. Each beam travels a different leg of the tube, is reflected at the mirror at left, and returns through the opposite leg of the tube. Thus, both beams travel the same path, but one in the direction of flow of the water, and the other opposing the flow. The two beams are recombined at the detector, forming an interference pattern that depends upon any difference in time traveling the two paths.[2]
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انظر أيضاً
المصادر
- ^ Lawson, Peter R. "Principles of Long Baseline Stellar Interferometry." Course notes from the 1999 Michelson Summer School, held August 15–19, 1999. Editied by Peter R. Lawson. Published by National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 2000.
- ^ Robert Williams Wood (1905). Physical Optics. The Macmillan Company. p. 514.
وصلات خارجية
- Some typical measurement setups from the booklet of interferometer manufacturer Zygo Corp.