Astronomy Astrophysics

New PDF release: An Introduction to Optical Stellar Interferometry

By A. Labeyrie

ISBN-10: 0511224877

ISBN-13: 9780511224874

ISBN-10: 0521535654

ISBN-13: 9780521535656

ISBN-10: 0521828724

ISBN-13: 9780521828727

Over the past twenty years, optical stellar interferometry has turn into an incredible device in astronomical investigations requiring spatial answer well past that of conventional telescopes. This e-book, first released in 2006, was once the 1st to be written at the topic. The authors offer a longer advent discussing uncomplicated actual and atmospheric optics, which establishes the framework essential to current the information and perform of interferometry as utilized to the astronomical scene. They persist with with an outline of ancient, operational and deliberate interferometric observatories, and a variety of significant astrophysical discoveries made with them. ultimately, they current a few as-yet untested principles for tools either at the flooring and in house which could let us photo info of planetary structures past our personal.

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Additional resources for An Introduction to Optical Stellar Interferometry

Sample text

The identification, by means of their velocity, of light and radio waves as manifestations of electromagnetic waves predicted by J. C. Maxwell was one of the greatest triumphs of nineteenth century physics. The basic derivation of electromagnetic waves from Maxwell’s equations, as we express it in vector notation† today, is given in Appendix A. The telescope is a device which concentrates the electromagnetic radiation from a distant source onto a detector. e. its output is a position-dependent signal, which is interpreted eventually by the observer’s brain as an image of the source.

Then we denote the optical path between the point at which the waves separated when they first met the beam-splitter to the point at which they recombine on their second meeting with the beam-splitter as l1 by one route through mirror M1 , and l2 by the route through mirror M2 . The optical path is defined as the physical path multiplied by the refractive index of the medium in which it is propagating. Most of the path is in air but some parts are within glass. Now consider the recombined beam at A.

The second is the wavevector k, which is a vector of length 2π/λ in the direction of propagation of the wave (normal to the wavefronts). It has dimensions of inverse length‡ . 3) where r is position in real space. You can see that the wavefronts now correspond to k · r = const. This defines a plane normal to the wavevector k. 3) is called a plane wave and is the basic building block of physical optics. e. we let h and A become vectors. If the disturbance is normal to the propagation direction, the wave is transverse and since there are two independent normals, there are two polarizations.

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An Introduction to Optical Stellar Interferometry by A. Labeyrie

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