| 摘要 |
A method of and apparatus for compensating for signal drift in container inspection apparatus using radiant energy emitters and detectors for scanning the containers in combination with a processing circuit associated with the emitters and detectors for synchronizing the scanning signals and processing the signals in subcircuits such that the signals generated during intervals when no container is being scanned are constantly being examined for drift and signals compensated for drift, if any, are used for comparison with container inspection scan signals to determine if a container needs to be rejected.
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