DE-NOISING OF 2-DIMENSIONAL ANGULAR-CORRELATION OF POSITRON-ANNIHILATION RADIATION DATA USING DAUBECHIES WAVELET THRESHOLDING

Two-dimensional angular correlation of positron annihilation radiation (2D-ACAR) experiments provide a means of determining the electron-pos itron momentum density in metals and alloys over a wide range of tempe ratures. A difficult task regarding this method is the reconstruction of the three-dimensional density from a limited number of two-dimensio nal projections. Difficulties arise from noise superimposed on the dat a. This paper explains and demonstrates the use of a wavelet noise fil ter, and gives a comparison of wavelet and Fourier filters.