A method for automatic collimator alignment in microdensity measurements |
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| Authors: | K Pernestål B Jonsson |
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| Institution: | (1) Faculty of Forestry, Institute of Biometry and Forest Management, S-903 80 Umeå, Sweden;(2) Institute of Physics, Box 530, S-751 21 Uppsala, Sweden |
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| Abstract: | Summary In microdensitometry, based on X-ray absorption technique and a  direct , electronic detector technique, it is usually not possible to observe the collimator and its alignment to the annual ring under investigation during the measurement. In this paper a method for automatic alignment of the collimator to the ring is described. The operating technique is based on an optimization of the resolution of the instrument at every annual ring while the collimator is rotated to the best position. The procedure has been in use a number of years and has proven itself to be efficient and reliable. The theory of operation for the procedure is described and its software structure is shown in a block diagram. Advantages and limitations of the procedure are discussed.The funding of this project is made by Nordbanken. The density profile in Fig. 5 has been recorded by Mr. Bo Larsson and is published with his kind permission |
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