CALIBRATION APPARATUS FOR CHEMICAL SENSOR

• US 20110282614A1
• Filed: 05/12/2011
• Published: 11/17/2011
• Est. Priority Date: 05/13/2010
• Status: Abandoned Application

• Current Assignee: Yokogawa Electric Corporation
• Original Assignee: Yokogawa Electric Corporation
• Inventors: KIYONO, Shinjirou
• Application Number:
  US13/106,661
• Publication Number:
  US 20110282614A1
• Time in Patent Office: Days
• US Class Current: 702/104
• CPC Class Codes: G01N 27/4163 checking the operation of, or calibrating, the measuring apparatus G01N27/3274, G01N27/4175 and G01N33/0006 take precedence

Abstract

A calibration apparatus for a chemical sensor may include a conversion calculation unit that acquires a measurement value of a calibration solution that is measured by the chemical sensor and calculates a conversion calculation output, a calibration sensitivity extraction unit that receives the conversion calculation output and extracts a calibration sensitivity from the conversion calculation output, a calibration history storage unit that stores past histories of the calibration sensitivity, and a sensitivity variation curve prediction unit that predicts a sensitivity variation curve based on the past histories of the calibration sensitivity, the sensitivity variation curve prediction unit calculating a sensitivity correction value based on the sensitivity variation curve, the sensitivity variation curve prediction unit supplying the sensitivity correction value to a sensitivity correction part that performs a sensitivity correction in a measurement apparatus.

Claims

1. A calibration apparatus for a chemical sensor comprising:

a conversion calculation unit that acquires a measurement value of a calibration solution that is measured by the chemical sensor, the conversion calculation unit calculating and outputting a conversion calculation output;

a calibration sensitivity extraction unit that receives the conversion calculation output from the conversion calculation unit, the calibration sensitivity extraction unit extracting a calibration sensitivity from the conversion calculation output;

a calibration history storage unit that receives the calibration sensitivity from the calibration sensitivity extraction unit, the calibration history storage unit storing past histories of the calibration sensitivity; and

a sensitivity variation curve prediction unit that reads the past histories of the calibration sensitivity, the sensitivity variation curve prediction unit predicting a sensitivity variation curve based on the past histories of the calibration sensitivity, the sensitivity variation curve prediction unit calculating a sensitivity correction value based on the sensitivity variation curve, the sensitivity variation curve prediction unit supplying the sensitivity correction value to a sensitivity correction part that performs a sensitivity correction in a measurement apparatus.

2. The calibration apparatus according to claim 1, further comprising:

a sensitivity variation curve shift unit that causes the predicted sensitivity variation curve to be matched to a newest value of the calibration sensitivity.

3. The calibration apparatus according to claim 1, wherein

the chemical sensor measures the calibration solution at a predetermined time interval, and the sensitivity variation curve prediction unit updating the sensitivity variation curve and the sensitivity correction value at the predetermined time interval.

4. The calibration apparatus according to claim 1, wherein

the chemical sensor measures the calibration solution at any time, and the sensitivity variation curve prediction unit updating the sensitivity variation curve and the sensitivity correction value at any time.

5. The calibration apparatus according to claim 1, wherein the chemical sensor is any one of a pH meter, a dissolved oxygen (DO) meter, and a chlorine meter.

6. A calibration apparatus for a chemical sensor comprising:

a conversion calculation unit that acquires a measurement value of a calibration solution that is measured by the chemical sensor, the conversion calculation unit calculating and outputting a conversion calculation output;

a calibration zero-point extraction unit that receives the conversion calculation output from the conversion calculation unit, the calibration zero-point extraction unit extracting a calibration zero-point from the conversion calculation output;

a calibration history storage unit that receives the calibration zero-point from the calibration zero-point extraction unit, the calibration history storage unit storing past histories of the calibration zero-point; and

a zero-point variation curve prediction unit that reads the past histories of the calibration zero-point, the zero-point variation curve prediction unit predicting a zero-point variation curve based on the past histories of the calibration zero-point, the zero-point variation curve prediction unit calculating a zero-point correction value based on the zero-point variation curve, the zero-point variation curve prediction unit supplying the zero-point correction value to a zero-point correction part that performs a zero-point correction in a measurement apparatus.

7. The calibration apparatus according to claim 6, further comprising:

a zero-point variation curve shift unit that causes the predicted zero-point variation curve to be matched to a newest value of the calibration zero-point.

8. The calibration apparatus according to claim 6, wherein

the chemical sensor measures the calibration solution at a predetermined time interval, and the zero-point variation curve prediction unit updating the zero-point variation curve and the zero-point correction value at the predetermined time interval.

9. The calibration apparatus according to claim 6, wherein

the chemical sensor measures the calibration solution at any time, and the zero-point variation curve prediction unit updating the zero-point variation curve and the zero-point correction value at any time.

10. The calibration apparatus according to claim 6, wherein the chemical sensor is any one of a pH meter, a dissolved oxygen (DO) meter, and a chlorine meter.

11. A measurement system comprising:

a measurement apparatus comprising;

a conversion calculation unit that acquires a first measurement value of a measurement solution that is measured by a chemical sensor, the conversion calculation unit including a sensitivity correction part, and

a calibration apparatus comprising;

a conversion calculation unit that acquires a second measurement value of a calibration solution that is measured by the chemical sensor, the conversion calculation unit calculating and outputting a conversion calculation output;

a calibration sensitivity extraction unit that receives the conversion calculation output from the conversion calculation unit, the calibration sensitivity extraction unit extracting a calibration sensitivity from the conversion calculation output;

a calibration history storage unit that receives the calibration sensitivity from the calibration sensitivity extraction unit, the calibration history storage unit storing past histories of the calibration sensitivity; and

a sensitivity variation curve prediction unit that reads the past histories of the calibration sensitivity, the sensitivity variation curve prediction unit predicting a sensitivity variation curve based on the past histories of the calibration sensitivity, the sensitivity variation curve prediction unit calculating a sensitivity correction value based on the sensitivity variation curve, the sensitivity variation curve prediction unit supplying the sensitivity correction value to the sensitivity correction part, and

wherein the sensitivity correction part performs a sensitivity correction based on the sensitivity correction value.

12. The measurement system according to claim 11, wherein the calibration apparatus further comprising:

a sensitivity variation curve shift unit that causes the predicted sensitivity variation curve to be matched to a newest value of the calibration sensitivity.

13. The measurement system according to claim 11, wherein

the chemical sensor measures the calibration solution at a predetermined time interval, and the sensitivity variation curve prediction unit updating the sensitivity variation curve and the sensitivity correction value at the predetermined time interval.

14. The measurement system according to claim 11, wherein

the chemical sensor measures the calibration solution at any time, and the sensitivity variation curve prediction unit updating the sensitivity variation curve and the sensitivity correction value at any time.

15. The measurement system according to claim 11, wherein the chemical sensor is any one of a pH meter, a dissolved oxygen (DO) meter, and a chlorine meter.

16. A measurement system comprising:

a measurement apparatus comprising;

a conversion calculation unit that acquires a first measurement value of a measurement solution that is measured by a chemical sensor, the conversion calculation unit including a zero-point correction part, and

a calibration apparatus comprising;

a conversion calculation unit that acquires a second measurement value of a calibration solution that is measured by the chemical sensor, the conversion calculation unit calculating and outputting a conversion calculation output;

a calibration zero-point extraction unit that receives the conversion calculation output from the conversion calculation unit, the calibration zero-point extraction unit extracting a calibration zero-point from the conversion calculation output;

a calibration history storage unit that receives the calibration zero-point from the calibration zero-point extraction unit, the calibration history storage unit storing past histories of the calibration zero-point; and

a zero-point variation curve prediction unit that reads the past histories of the calibration zero-point, the zero-point variation curve prediction unit predicting a zero-point variation curve based on the past histories of the calibration zero-point, the zero-point variation curve prediction unit calculating a zero-point correction value based on the zero-point variation curve, the zero-point variation curve prediction unit supplying the zero-point correction value to the zero-point correction part, and

wherein the zero-point correction part performs a zero-point correction based on the zero-point correction value.

17. The measurement system according to claim 16, wherein the calibration apparatus further comprising:

a zero-point variation curve shift unit that causes the predicted zero-point variation curve to be matched to a newest value of the calibration zero-point.

18. The measurement system according to claim 16, wherein

the chemical sensor measures the calibration solution at a predetermined time interval, and the zero-point variation curve prediction unit updating the zero-point variation curve and the zero-point correction value at the predetermined time interval.

19. The measurement system according to claim 16, wherein

the chemical sensor measures the calibration solution at any time, and the zero-point variation curve prediction unit updating the zero-point variation curve and the zero-point correction value at any time.

20. The measurement system according to claim 16, wherein the chemical sensor is any one of a pH meter, a dissolved oxygen (DO) meter, and a chlorine meter.