Doświadczenie Michelsona - Stanowisko Edukacyjne EXP200090

1. RINGS, LAW IN √n
   

1. Verify the theory of composition of rings of equal tilt. If we study the diameter of concentric rings, we observe that this diameter varies by a ring according to the root of its order. Thus the fourth ring will be twice as large as the first one. This study will be conducted with a sodium source (or filtered high pressure mercury). To keep a trace of the results, we shall use the Caliens CCD detector.  This will let us measure ring diameters accurately and generate a data  bank with your devices when preparing hands-on exercises.
   
   

1. NOTION OF AN AIR WEDGE
   

1. An air wedge is a name stemming from mirror positions. It also refers to the effect generated by a specific configuration of settings.We call «air wedge» a slight tilt of M2 with respect to M1 in  the immediate vicinity of the optical contact. In fact it is as though  the two beams interfered after passing through an air wedge.
   
   

1. MEASURING THE AIR REFRACTIVE INDEX
   

1. A hermetic tank with parallel surfaces, in which a vacuum can be created, is placed in one of the arms of a Michelson interferometer, set to display rings, for laser light. Air pumping in the tank produces a variation in optical path difference resulting in a scroll-down of the rings on the screen. The  air refractive index can be measured by counting the rings scrolled down  in the centre of the figure. In reality, we shall gradually  depressurise the tank for a number of pressure values : -200, -400,  -600, -800, -900 hPa (negative pressure with respect to atmospheric  pressure). Each time it is opened, we shall start to record using the  Caliens camera before observing the number of output oscillations.

• Beating of a spectral lamp

• Notion of an air wedge

• Optical contact and WLF (white light fringe)

• Glass slide thickness

• Measuring vacuum index

• Fourier transform of a spectral lamp

• Michelson’s study

• Rings, law in √n