Michelson's experiments : EXP200090 or EXP200091
Référence : EXP 200 090
The Michelson interferometer is an optical device producing interferences by amplitude division. It consists of two flat mirrors and a semi-reflecting plate attached to a compensator. A number of experiments are possible, such as parallel beam splitters and air wedge configuration, vacuum refractive index measurement and glass slide thickness. For example, sodium beats highlight is also possible with the motor. We can equally highlight the piezoelectric effect.
RINGS, LAW IN √n
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.
NOTION OF AN AIR WEDGE
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.
MEASURING THE AIR REFRACTIVE INDEX
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.
SUBJECTS APPROACHED
»»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
NECESSARY EQUIPMENT
COMPOSITION
EXP200091 Michelson's experiments (BASIC)
| Reference | Description | quantity | | POD013495 | Michelson Interferometer | 1 | | POD013565 | Motorization for Michelson interferometer | 1 | | DPO020200 | Halogen lantern | 1 | | POD013210 | HeNe laser | 1 | | POD010053 | Condenser | 1 | | POD002192 | Half-moon stand | 4 | | POD060130 | Component holder, Ø 80 mm | 1 | | POD608420 | Lens, f= +100 mm, Ø 80 mm | 1 | | POD010020 | Superior Caliens Camera | 1 |
Computer is required for the camera
COMPOSITION
EXP200090 Michelson's experiments (COMPLETE)
| Reference | Description | quantity | | POD013495 | Michelson Interferometer | 1 | | POD013565 | Motorization for Michelson interferometer | 1 | | DPO020020 | Power supply for ECO27 spectral lamps | 1 | | POF010061 | Sodium spectral lamp, ECO27 (with E27 socket), bulb only | 1 | | POF010062 | Mercury spectral lamp, ECO27 (with E27 socket), bulb only | 1 | | DPO020200 | Halogen lantern | 1 | | POD013210 | HeNe laser | 1 | | POD013497 | Plater holder | 1 | | POD013499 | Vacuum tank + manual pump | 1 | | POD010053 | Condenser | 1 | | POD002192 | Half-moon stand | 4 | | POD060130 | Component holder, Ø 80 mm | 1 | | POD608420 | Lens, f= +100 mm, Ø 80 mm | 1 | | POD010020 | Superior Caliens Camera | 1 |
Computer is required for the camera |
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