Diffraction tp ts 2012
NB: CCD sensor is 15 mm offset from the mac os x 10.9 iso direct support axis.
I(theta) is the intensity in a direction given by the angle theta; ell is the width of the slit; lambda is the wavelength of the plane wave.
Never direct the laser beam at another person.Turn on the laser.It is defined as the bending of light around the corners of an obstacle or aperture into the region of the geometrical shadow of the obstacle.We note i_textd the distance between two darks-fringes : i_textdlambda, fracDell The distance between k-1 and k1 dark fringes is 2i_textd.The sensor is composed of 2048 pixels, 14 m in width.The procedure is the same as for single slit diffraction.Model wagons RIC 1435 mm and screw coupler is made in compliance with the highest standards for quality and precision manufacturing model.Acquire the intensity profile of diffracted light and accurately measure the x_k position of the minima (use the zoom function).Determine the wavelength with uncertainty at the 95 confidence level Diffraction by a circular aperture To prepare : Find the theoretical value of the constant a relative to the circular aperture diffraction.The scalar theory of diffraction was established by Augustin Fresnel.Is the eqrefeq:TP2_formule_airy law verified?The intensity profile shows circular dark fringes.This practical work aims to study the diffraction phenomenon through the observation and analysis of the laser beam deflected by different obstacles.Identify the Airy disc and the rings.Carefully align(horizontally and vertically) the laser beam with the centre of the sensor to obtain an optimum signal.Let us compute the minima of the intensity pattern (dark fringes corresponding to destructive interference defined by I(theta)0.Dernière mise à jour : antz / androt / ussel Mentions légales.Place the CCD sensor at a distance D1,0;mathrmm from the slit.
Never look directly into the laser.