Coil Sensor Tensile Force Measurement with Temperature Compensation
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Solution Overview
Problem
Conventional methods for measuring tensile force in structures like concrete bridges and high-rise buildings using electromagnetic sensors are impractical due to the need for large equipment and are inaccurate in environments with significant temperature changes, as the magnetic hysteresis curve is sensitive to temperature variations.
Innovation Solution
A coil sensor-based system that includes a thermistor for temperature detection and a machine learning algorithm to acquire and compensate for temperature effects on magnetic hysteresis curve information, enabling accurate tensile force estimation by constructing databases based on magnetic flux density and thermistor resistance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a strong magnetic field is generated to magnetize the tendon for sufficient measurement resolution, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent replaces the conventional electromagnetic sensor system that requires large equipment and high power consumption with a coil sensor system that uses magnetic hysteresis curve characteristics. The coil sensor detects changes in magnetic flux density through the tendon without requiring strong external magnetic fields or large equipment, substituting a simpler magnetic detection mechanism for the complex electromagnetic sensing system.
Solution Approach 2:
The patent changes the measurement approach from direct electromagnetic sensing to detecting magnetic hysteresis curve parameters. By measuring the area of the magnetic hysteresis curve formed when the coil sensor is energized, the system can determine tensile force without requiring the tendon to be strongly magnetized, thus reducing power consumption and equipment complexity while maintaining measurement precision.
2Measurement precision
If magnetic hysteresis curve measurement is used for tensile force detection, then measurement capability is improved, but temperature sensitivity increases
Solution Approach 1:
The patent incorporates temperature compensation by measuring the magnetic hysteresis curve at different temperatures and using this information to correct measurements. The system collects temperature data and adjusts the tensile force calculation based on the observed temperature-dependent changes in magnetic hysteresis characteristics, effectively compensating for temperature effects and maintaining measurement accuracy in varying thermal conditions.
Solution Approach 2:
The patent performs preliminary measurements of the magnetic hysteresis curve at various temperatures before actual tensile force monitoring. By establishing a baseline relationship between temperature and magnetic hysteresis characteristics in advance, the system can later compensate for temperature effects during actual measurements, ensuring accurate tensile force detection even when temperature changes occur during monitoring.
3Ease of operation
If conventional electromagnetic sensors are used in structures with large temperature changes, then tensile force monitoring is enabled, but measurement accuracy deteriorates
Solution Approach 1:
The patent replaces conventional electromagnetic sensors with a coil sensor system that exploits magnetic hysteresis properties. This substitution enables tensile force monitoring in structures with large temperature changes because the magnetic hysteresis curve area is less sensitive to temperature variations compared to conventional electromagnetic sensing methods, thereby maintaining measurement accuracy in thermally variable environments.
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
Enables accurate estimation of tensile force even in severe temperature change environments, improving the practicality and accuracy of tensile force measurement in structural monitoring.
Implementation Method 1
a coil sensor configured to magnetize an inspection target object, and to detect information about a magnetic flux density formed by the magnetized inspection target object
Implementation Method 2
a thermistor disposed to detect the temperature of a place where the coil sensor is installed
Implementation Method 3
a tensile force measurement server configured to acquire magnetic hysteresis curve information based on the temperature for the inspection target object
Data Source
AI summary
Disclosed herein is a coil sensor-based tensile force measurement system capable of temperature compensation. The coil sensor-based tensile force measurement system includes: a coil sensor configured to magnetize an inspection target object, and to detect information about a magnetic flux density formed by the magnetized inspection target object; a thermistor disposed to detect the temperature of a place where the coil sensor is installed; and a tensile force measurement server configured to acquire magnetic hysteresis curve information based on the temperature for the inspection target object, based on information collected by the coil sensor and the thermistor.