| 摘要 |
<p>PURPOSE:To continuously measure oxygen by radiating near infrared rays with the specific wavelength to obtain the spectral spectrum, content in a specimen by the multi-variate analysis method, and calculating oxygen. CONSTITUTION:Optical fibers 3, 4 connected with the outside 3 to a light source l and connected with the inside 4 to a detector are fitted to a sensor section. Near infrared rays with the wavelength 700-1200nm are radiated to the fermented milk in the fermentation process to obtain the spectral spectrum. The near infrared absorption spectrum is measured on multiple specimens, preferably 30 specimens or more, and the wavelength suitable for the acidity measurement by the multi-variate analysis method and the constituent conversion factor value are obtained by the multiple regression analysis with a computer based on the measured values to generate a calibration curve. After the calibration curve is generated, the near infrared absorption spectrum is measured at the optimum wavelength for obtaining the acidity in the fermented milk by the same method as that for generating the calibration curve, and the measured value is compared with the calibration line to obtain the acidity in the fermented milk.</p> |
