Displaying the energy distribution of Airy disk on an oscilloscope

摘要

rgy distribution of Airy disk includes a lot of useful information of optical systems, through researchers and engineers in the field who have developed several kinds of systems to measure the distribution. A more convenient and low cost system is still required for a general optics-related lab. In this paper, a microprocessor-based system for displaying three dimensional energy distribution of Airy disk on oscilloscope is described. A laser beam (to be measured) goes on to a linear CCD camera which is on a table driven by a stepping motor. The output of the camera is received by a signal conditioning circuit and then sent to an A/D converter which is one of the interfaces of the microprocessor, CCD sensor drive and control, signal processing and signal output to an oscilloscope through D/A converter is the task of the microprocessor. The sensor pixel area is 14 $mu@m $MUL 14 $mu@m, the resolution in X direction is 14 $mu@m, a super-resolution arithmetic method is employed in Y direction, it leads to 2 $mu@m resolution. The method is described in detail in this paper. An experimental setup has also been developed. The Airy disk of a 0.1 mm diameter microhole diffraction pattern has been measured with this setup, the result has been analyzed.