| 摘要 |
PROBLEM TO BE SOLVED: To obtain stabilized measuring accuracy even if the external environmental conditions such as external temperature and humidity change by computing the reference absorbance from the reference irradiation light quantity and the transmitted light through a reference color plate, and correcting the error caused the change with time. SOLUTION: At first, the analysis device is operated without inserting anything into a sample measuring part 13, and a reference value R0 of the quantity of the transmitted light is computed by an operator 22. Then, when a reference color plate 18 is inserted into the measuring part 13, and the analysis device is operated, the near infrared rays from a light source 1 are mode incident on the measuring part 13 through a lens 2, a slit 5 and a BPF 7. Transmitting light R1 is transmitted through a reference color plate 18 and detected by a light receiving element 14. The absorbance is obtained by log R0/R1 from the reference value R0 of the transmitting light and the transmitting light R1 of the reference color plate 18. Then, after the deviation of the absorbance is corrected by an operator 22, the sample to be measured is inputted from a sample supplying part 15, and the absorbance is measured. The absorbance of the sample to be measured is computed by log R0/R2 from the reference value R0 of the quantity of the transmitting light and the quantity of the transmitting light R2 of the sample to be measured. |
