| 摘要 |
PROBLEM TO BE SOLVED: To control a desitometer to improve the measurement precision by driving a photometric scanning means in the state where no support body is present to store the empty scanning data, and correcting the photometric data of the support body having a migration image formed thereon on the basis of this. SOLUTION: A photometric scanning means 10 is driven (empty scanned) in the state where no support body is present in a photometric part according to a preset timing by the control of a control part 38 or a proper instruction from an input and output part 22 to store the empty scanning data in a memory 33a, and the latest scanning data is supplied to a comparative part 34. In the comparative part 34, the empty scanning data is compared with the allowable value from an allowable value setting part 35 to discriminate the contamination or affection of a transparentized liquid or the contamination or flaw of a vessel, and when the empty scanning data is the allowable value or more, an alarm signal is outputted to the input and output part 22. An arithmetic part 36 subtracts the latest empty scanning data from each migration image photometric data stored in the memory 33b and corrects the error by the state change of the vessel itself. |
