AQUEOUS SAMPLE FLUID MEASUREMENT AND ANALYSIS

• US 20170097300A1
• Filed: 09/30/2016
• Published: 04/06/2017
• Est. Priority Date: 10/02/2015
• Status: Active Grant

• Current Assignee: Hach Company (Veralto Corp.)
• Original Assignee: Hach Company (Veralto Corp.)
• Inventors: Lu, Zhao, Harmon, Brian
• Granted Patent: US 10,175,163 B2
• Time in Patent Office: Days
• CPC Class Codes: G01N 21/27 using photo-electric detection G01N21/31 takes precedence; circuits for computing concentration logarithmic circuits G06G7/24; photometric circuits in general G01J
• CPC Class Codes: G01N 21/78 producing a change of colour
• CPC Class Codes: G01N 2201/0221 Portable; cableless; compact; hand-held
• CPC Class Codes: G01N 2201/12 Circuits of general importance; Signal processing
• CPC Class Codes: G01N 33/1853 hardness of water

Abstract

An embodiment provides a method for determining a concentration of an analyte in a fluid sample, including: introducing a fluid sample into a measurement chamber; operating a measurement device to introduce light of a first wavelength to the fluid sample; measuring, with a detector, absorbance of the light of the first wavelength with respect to the fluid sample; operating the measurement device to introduce light of a second wavelength to the fluid sample; measuring, with the detector, absorbance of the light of the second wavelength with respect to the fluid sample; determining, using a processor of the measurement device, an absorbance ratio of the fluid sample using both the measured absorbance of the light of the first wavelength and the measured absorbance of the light of the second wavelength; and providing, via an output device, a determined concentration value for the fluid sample that correlates to the absorbance ratio. Other aspects are described and claimed.

Claims

1. A method for determining a concentration of an analyte in a fluid sample, comprising:

introducing a fluid sample into a measurement chamber;

operating a measurement device to introduce light of a first wavelength to the fluid sample;

measuring, with a detector, absorbance of the light of the first wavelength with respect to the fluid sample;

operating the measurement device to introduce light of a second wavelength to the fluid sample;

measuring, with the detector, absorbance of the light of the second wavelength with respect to the fluid sample;

determining, using a processor of the measurement device, an absorbance ratio of the fluid sample using both the measured absorbance of the light of the first wavelength and the measured absorbance of the light of the second wavelength; and

providing, via an output device, a determined concentration value for the fluid sample that correlates to the absorbance ratio.

2. The method of claim 1, wherein the first wavelength is about 510 nm.

3. The method of claim 2, wherein the second wavelength is about 655 nm.

4. The method of claim 1, wherein the fluid sample is water.

5. The method of claim 4, wherein the determined concentration value is reported in parts per million (ppm).

6. The method of claim 5, wherein the determined concentration value is in a range of about 3 to about 25 ppm.

7. The method of claim 6, wherein the determined concentration value is in a range of about 20 to about 100 ppm.

8. The method of claim 4, wherein the determined concentration value is a water hardness value.

9. An apparatus, comprising:

a measurement chamber;

a light source;

a light detector;

an output device; and

a memory having instructions that execute by a processor to;

operate the light source to introduce light of a first wavelength to a fluid sample in the measurement chamber;

measure, with the light detector, absorbance of the light of the first wavelength with respect to the fluid sample;

operate the light source to introduce light of a second wavelength to the fluid sample;

measure, with the light detector, absorbance of the light of the second wavelength with respect to the fluid sample;

determine an absorbance ratio of the fluid sample using both the measured absorbance of the light of the first wavelength and the measured absorbance of the light of the second wavelength; and

provide, via the output device, a determined concentration value for the fluid sample that correlates to the absorbance ratio.

10. The apparatus of claim 9, wherein the first wavelength is about 510 nm.

11. The apparatus of claim 10, wherein the second wavelength is about 655 nm.

12. The apparatus of claim 9, wherein the light source comprises more than one light source.

13. The apparatus of claim 9, wherein the fluid sample is water.

14. The apparatus of claim 13, wherein the determined concentration value is reported in parts per million (ppm).

15. The apparatus of claim 14, wherein the determined concentration value is in a range of about 3 to about 25 ppm.

16. The apparatus of claim 15, wherein the determined concentration value is in a range of about 20 to about 100 ppm.

17. The apparatus of claim 13, wherein the determined concentration value is a water hardness value.

18. A program product, comprising:

a storage device that stores code that is executable by a processor, comprising;

code that operates a light source to introduce light of a first wavelength to a fluid sample in a measurement chamber;

code that measures, with a light detector, absorbance of the light of the first wavelength with respect to the fluid sample;

code that operates the light source to introduce light of a second wavelength to the fluid sample;

code that measures, with the light detector, absorbance of the light of the second wavelength with respect to the fluid sample;

code that determines an absorbance ratio of the fluid sample using both the measured absorbance of the light of the first wavelength and the measured absorbance of the light of the second wavelength; and

code that provides, via an output device, a determined concentration value for the fluid sample that correlates to the absorbance ratio.

19. The program product of claim 18, wherein the first wavelength is about 510 nm.

20. The program product of claim 19, wherein the second wavelength is about 655 nm.