Vibratory Density Sensor Thermal Compensation
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Solution Overview
Problem
Existing density measurement systems using vibratory bodies face inaccuracies during fluid changes, particularly due to temperature changes, leading to opposite measuring errors and dynamic measuring errors that are not adequately compensated.
Innovation Solution
A method and system that utilize a vibratory body with specific thermal conductivity and heat capacity to account for temperature changes by registering vibrations and temperature signals, compensating for discrepancies in temperature measurement delays to improve density measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a vibratory body is used to measure fluid density, then density measurement is achieved, but temperature changes during fluid transitions cause measuring errors
Solution Approach 1:
The system performs preliminary actions by continuously monitoring temperature changes and predicting their effect on vibratory body properties before they significantly affect density measurements. The temperature compensation is proactively applied based on detected temperature drift, preventing measurement errors rather than correcting them after occurrence.
Solution Approach 2:
The system implements feedback mechanisms by continuously measuring the actual density and comparing it with expected values. When deviations are detected that correlate with temperature changes, the system adjusts compensation parameters in real-time, creating a closed-loop control system that maintains measurement accuracy despite thermal fluctuations.
2Measurement precision
If temperature compensation is applied to correct measuring errors, then measurement accuracy improves, but time delays in temperature signal registration create dynamic measuring errors
Solution Approach 1:
The system applies preliminary action by predicting future temperature values based on current temperature trends and the known thermal response characteristics of the vibratory body. This predictive approach compensates for the inherent time delay in temperature signal registration, allowing the system to use anticipated rather than lagged temperature data for compensation calculations.
Solution Approach 2:
The system introduces an intermediary computational model that represents the thermal dynamics between the fluid and vibratory body. This mathematical intermediary translates the delayed temperature sensor output into an estimated real-time temperature of the vibratory body, effectively bridging the time gap between measurement and compensation application.
3Speed
If the vibratory body has high thermal conductivity to quickly respond to temperature changes, then temperature tracking improves, but heat capacity increases causing slower thermal response
Solution Approach 1:
The system dynamically adjusts operational parameters including excitation frequency and amplitude of the vibratory body based on detected temperature conditions. By changing these parameters in response to thermal state, the system optimizes the balance between thermal response speed and measurement accuracy, effectively adapting to varying thermal inertia conditions during fluid transitions.
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
The system effectively compensates for dynamic measuring errors during fluid changes, providing more accurate density measurements by aligning temperature and resonant frequency curves, thus reducing inaccuracies and improving measurement reliability.
Implementation Method 1
the vibratory body executes, at least partially, resonant oscillations, namely mechanical oscillations with a resonant frequency, which is dependent on the mechanical construction of the vibratory body, as well as also on the density of the fluid
Implementation Method 2
a specific thermal conductivity, λ10, for example, of greater than 5 W K−1 m−1, thus a thereon dependent, thermal conductance effective for heat transfer from, on the one hand, a fluid contacting, first surface of the vibratory body
Data Source
AI summary
A method for producing at least one oscillation measurement signal, which has vibrations of a vibratory body are registered. A temperature sensor is applied thermally attached with a non fluid contacting, second surface of the vibratory body for producing a temperature measurement signal representing a time curve of a variable temperature of the vibratory body. The temperature measurement signal can follow, however time delayed, a change of the temperature of the vibratory body from a beginning temperature value, to a new temperature value. Based on the oscillation measurement signal as well as the temperature measurement signal, density, measured values are produced representing the density, wherein, during such, discrepancies possibly occurring between the time curve of the temperature of the vibratory body and the temperature measurement signal are taken into consideration, respectively at least partially compensated.