US 12,405,212 B1
Calibration method of measurement temperature of concentration measurement apparatus, and concentration measurement apparatus
Shinobu Ito, Shizuoka (JP); and Makoto Sagara, Tokyo (JP)
Assigned to AMANO Co., Ltd., Shizuoka (JP)
Appl. No. 18/993,787
Filed by AMANO Co., Ltd., Iwata (JP)
PCT Filed Oct. 3, 2023, PCT No. PCT/JP2023/036056
§ 371(c)(1), (2) Date Jan. 13, 2025,
PCT Pub. No. WO2025/074505, PCT Pub. Date Apr. 10, 2025.
Int. Cl. G01N 21/31 (2006.01)
CPC G01N 21/31 (2013.01) [G01N 2201/127 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A calibration method of a measurement temperature of a concentration measurement apparatus performing, based on measurement of a temperature and a transmittance or an absorbance, concentration measurement on a sample having a correlation between a temperature, a transmittance or an absorbance, and a concentration, the calibration method comprising:
acquiring first correlation information between a temperature and a transmittance or an absorbance based on a first sample, the first sample having a known concentration;
measuring, over time, values related to the temperature, the transmittance or the absorbance, and an environmental temperature of the first sample by the concentration measurement apparatus, the concentration measurement apparatus including a sample temperature sensor, an optical sensor, and an environmental temperature sensor;
acquiring second correlation information between first difference information and second difference information, the first difference information being a difference between a measurement value of the environmental temperature and a measurement value of the temperature of the first sample, the second difference information being a difference between:
(1) a theoretical temperature, the theoretical temperature being based on the first correlation information with respect to a measurement value of the transmittance or the absorbance, and
(2) the measurement value of the temperature of the first sample;
in temperature measurement of a second sample during a concentration measurement of the second sample, the second sample having an unknown concentration, acquiring difference information between a measurement value of a temperature of the second sample measured by the sample temperature sensor and a measurement value of an environmental temperature measured by the environmental temperature sensor, and acquiring calibration temperature information based on the second correlation information with respect to the difference information associated with the second sample; and
calibrating the measurement value of the temperature of the second sample by using the calibration temperature information.