Method of calibration for nonlinear optical sensor
AssigneeEcolab USA Inc.
InventorsJoseph Erickson, Eugene Tokhtuev, Christopher Owen, Paul Schilling
Life of this patent
Estimating the term…
Abstract
A use composition monitor determines the concentration of peracid and/or peroxide in a use composition using a kinetic assay procedure. A sample mixture containing a sample of the use composition, a diluent and at least one reagent is prepared and analyzed using, for example, an optical detector. Response data obtained by the detector is used to determine the concentrations of peracid and/or peroxide in the use composition based upon an evaluation function determined by a calibration method. The calibration method includes determining coefficients of the evaluation function based upon known concentrations, and measured response data of calibration samples.
Claims14
A method of calibration for an optical analysis instrument comprising:
- preparing a plurality of calibration solutions, each solution comprising a known concentration of a peracid and a known concentration of a peroxide;
- determining at least two parameters of an optical characteristic of each of the calibration solutions;
- determining, for at least one calibration solution, an estimated concentration of the peracid based on a first high order conversion equation, a first group of equation coefficients, and each of the at least two parameters of the optical characteristic;
- determining, for at least one calibration solution, an estimated concentration of the peroxide based on a second high order conversion equation, a second group of equation coefficients, and each of the at least two parameters of the optical characteristic;
- determining a difference between the known concentration of the peracid and the estimated concentration of the peracid, and a difference between the known concentration of the peroxide and the estimated concentration of the peroxide;
- and
- changing the first group of equation coefficients and the second group of equation coefficients so as to minimize the determined difference between the known concentration of the peracid and the estimated concentration of the peracid, and to minimize the determined difference between the known concentration of the peroxide and the estimated concentration of the peroxide wherein the plurality of calibration solutions comprises at least one of a set of solutions having a peracid concentration range from 1000 ppm to 4000 ppm, and a set of solutions having a peroxide concentration range from 5000 ppm to 40000 ppm.
Dependencies are inferred from the claim text.