Patent ID: 8880136

Claim:
A calibration method for calibrating an instrument for measuring a biogenic substance, using near-infrared spectral spectroscopy, the method comprising: (1) the step of measuring a specific substance of a biological object with the use of an instrument for measuring a biogenic substance, using a confocal optical system, (2) the step of using an instrument for measuring a biogenic substance, using near-infrared spectral spectroscopy, thereby measuring a specific substance in the same region of the biological object that is measured with the use of the instrument for measuring a biogenic substance, using the confocal optical system, (3) the step of comparing a measured value of the specific substance, measured in the step (1) with the use of the instrument for measuring a biogenic substance, using the confocal optical system, with a measured value of the specific substance, measured in the step (2) with the use of the instrument for measuring a biogenic substance, using near-infrared spectral spectroscopy, and calibrating the measured value of the specific substance, measured with the use of the instrument for measuring a biogenic substance, using near-infrared spectral spectroscopy, so as to match the measured value according to the instrument for measuring a biogenic substance, using the confocal optical system, and (4) the step of executing an operation in the step (3) at least once after the elapse of predetermined time.