| 摘要 |
A set of digitized values of a density-dependent variable are stored in computer memory. A corresponding set of digitized photoelectric signals, produced from a set of reference densities, are also stored in computer memory. An unknown sample density is photoelectrically examined, the resultant signal being digitized and searched for within the computer memory, thereby to gate out of memory the digitized value of the density-dependent variable that corresponds to the digitized photoelectric signal of the sample.
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