Viscosity Measurement Correction for Temperature Drift
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Solution Overview
Problem
Existing viscosity measurement methods using a rotator with a rotating magnetic field face significant errors across a wide temperature range due to temperature-dependent changes in the magnetic field, circuit, and rotator conductivity, leading to discrepancies between measured and true viscosity values.
Innovation Solution
The method involves calculating constants k1 and k2, which account for the temperature-dependent conductivity of the rotator, allowing for correction of viscosity measurements using the equation η = k1(ΩB - ΩS) - k2, where ΩS and ΩB are the rotator and magnetic field frequencies, respectively, to obtain accurate viscosity values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If viscosity is measured using a rotator with rotating magnetic field, then measurement can be performed, but measurement precision deteriorates across wide temperature ranges due to temperature-dependent changes in magnetic field, circuit, and rotator conductivity
Solution Approach 1:
The patent applies parameter changes by introducing temperature-dependent correction factors (k1 and k2) that adjust the viscosity calculation based on the actual temperature. The measurement system changes the calculation parameters dynamically according to temperature, allowing accurate viscosity measurement across wide temperature ranges by compensating for temperature-induced changes in magnetic field, circuit resistance, and rotator conductivity.
2Measurement precision
If temperature correction is applied using multiple parameters, then measurement precision improves, but device complexity increases
Solution Approach 1:
The system applies self-service by automatically measuring the temperature and calculating the appropriate correction factors without requiring manual intervention. The correction system self-adjusts based on the measured temperature, automatically applying the necessary corrections to maintain measurement accuracy across varying temperatures without increasing operational complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively corrects measurement errors caused by temperature changes, ensuring that viscosity values align with true values by utilizing the temperature-dependent conductivity of the rotator, simplifying the correction process and improving measurement accuracy across varying temperatures.
Implementation Method 1
Lorentz force works between the electric current generated on the rotator and the rotating magnetic field, and the rotator rotates along with the rotating magnetic field
Implementation Method 2
apply a rotating magnetic field to the rotator from an outside of the container... electric current generated on the rotator
Data Source
AI summary
In a method of measuring a viscosity of a sample based on a rotation frequency ΩS of a conductive rotator rotating by applying a rotating magnetic field from outside to the rotator set in a container containing the sample and a rotation frequency ΩB of the magnetic field, a constant k1 having temperature dependency of an apparatus and a constant k2 not having the temperature dependency at each temperature are found by using a equation, η0Ωs=k1(ΩB−ΩS)−k2, where a viscosity η0 at specific temperature is known, and then a value of viscosity measured at the specific temperature is corrected by means of the constants k1 and k2, the rotation frequency ΩS of the rotator, and the rotation frequency ΩB of the magnetic field. The constant k1 may employ the temperature dependency of electric conductivity of metal used to the rotator.