MEASURING APPARATUSES AND METHODS OF USING THEM
First Claim
1. A measuring instrument for measuring a value and providing a calibrated signal, comprising:
- at least one primary sensor for sensing the value wherein the at least one primary sensor generates a primary measurement signal;
at least one secondary sensor for generating at least one interference related signal for sensing at least one interference related value that reduces the precision of the primary measurement signal generated by the at least one primary sensor; and
a microcontroller containing a criteria optimized correction polynomial having the at least one primary measurement signal and said at least one interference related signal as independent variables and said calibrated signal as a dependent variable;
said microcontroller being connected to receive said at least one primary measurement signal and said at least one interference related signal, whereby said microcontroller corrects said at least one primary measurement signal for said at least one interference related signal to provide said calibrated signal.
0 Assignments
0 Petitions
Accused Products
Abstract
“A measuring instrument includes a transducer for measuring the depth of liquid and a transducer for measuring a physical parameter that causes interference error. A calibration polynomial is used to correct the output signal. The calibration polynomial includes the signal generated by the transducers as independent variables and the output signal as the dependent variable. The calibration polynomial is formed by a correction polynomial having at least one primary measurement signal and at least a first interference related signal as independent variables and a calibrated signal as a dependent variable. To form the calibration polynomial, a preliminary calibration polynomial including the primary independent variable and at least one interference related independent variable is developed. A plurality of data sets is generated from a test fixture. This data is used to eliminate the least significant terms of the preparatory calibration polynomial and to add the most significant cross terms”.
-
Citations
7 Claims
-
1. A measuring instrument for measuring a value and providing a calibrated signal, comprising:
-
at least one primary sensor for sensing the value wherein the at least one primary sensor generates a primary measurement signal; at least one secondary sensor for generating at least one interference related signal for sensing at least one interference related value that reduces the precision of the primary measurement signal generated by the at least one primary sensor; and a microcontroller containing a criteria optimized correction polynomial having the at least one primary measurement signal and said at least one interference related signal as independent variables and said calibrated signal as a dependent variable; said microcontroller being connected to receive said at least one primary measurement signal and said at least one interference related signal, whereby said microcontroller corrects said at least one primary measurement signal for said at least one interference related signal to provide said calibrated signal. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of making an instrument, comprising the steps of:
-
selecting a design criteria; preparing a criteria-optimized calibration curve; selecting a primary transducer and at least one secondary transducer; programming a microcontroller to correct a value measured by the primary transducer using the criteria-optimized calibration curve; and using the corrected value. - View Dependent Claims (7)
-
Specification