Abstract
It is often advantageous to use Ross filters of a thickness much greater than that which has been judged to be optimum by the criterion of maximum pass-band transmission. The thicker filters show a larger ratio of measurable pass-band radiation to total spectrum power received and to received power resulting from balance errors. Prefiltration, though useful in connection with thin filters, confers no advantage when thick filters are used. Balance errors caused by the variation with atomic number of the function representing the variation of absorption coefficient with wave-length may, in principle, be eliminated at an indefinite number of chosen wave-lengths by giving one filter a particular type of thickness non-uniformity. Techniques for the construction and adjustment of Ross filters are described.
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