| 摘要 |
PROBLEM TO BE SOLVED: To prevent measurement errors from increasing due to differences in device variations between measurement systems when a plurality of pairs of light projecting parts and light receiving parts are used to measure the optical characteristics of samples each interposed between a light projecting part and a light receiving part. SOLUTION: The device variations, more specifically, light attenuation factors ty' owing to dirt, etc., on walls of cells 1a, 1b are computed based on the quantities of light detected by detectors 3a, 3b, The attenuation factors ty' are compared with a threshold value. When the threshold value is exceeded, an output is produced to this effect. The value of the attenuation factors ty' may be outputted as it is. It can be prevented that measurement results are used while increased measurement errors of the samples are unnoticed. Accordingly, accurate measurement data can be provided at all times.
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