G - Physics – 01 – R
Patent
G - Physics
01
R
324/63
G01R 29/02 (2006.01) G01V 5/10 (2006.01)
Patent
CA 1070389
ABSTRACT OF THE DISCLOSURE A pulse circuit periodically produces test pulses of two different amplitudes which are eventually fed in appropriate time intervals to the input of a multi-channel pulse height analyzer to enable continuous monitoring and correction of the offset of the analyzer. Although the amplitudes of both pulses may drift with temperature and time, their amplitude ratio is substantially constant over a broad temperature range. The ratio of numbers, corresponding to the locations of the centroids of the two test pulse peaks in the pulse height analyzer output spectrum, is compared with a reference value of this ratio, and, if the measured ratio deviates excessively from the reference, the offset of the analyzer is adjusted in a direction such that subsequent centroid measurements and ratio comparisons yield tolerably small deviations from the reference ratio. The pulse amplitudes are modulated with noise so that output counts from the pulse height analyzer for each of the two test pulse peaks fall into several channels of the analyzer's amplitude range in order that centroids may be determined to precise fractional channel locations. In this way more precise values of the pulse amplitude ratio are possible than would be the case if noise were not added to the two pulse amplitudes. The in- -1- creased precision of the ratio permits control of the pulse height analyzer offset to within narrow limits.
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