Magnetoresistive Sensor Temperature Compensation
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Solution Overview
Problem
Existing magnetic field measurement technologies face challenges with large measurement errors due to temperature dependence and unknown magnetic field direction, particularly over wide temperature ranges and rapid temperature changes, and require difficult matching of magnetoresistive films.
Innovation Solution
A device comprising a magnetoresistive sensor with a polycrystalline thin film and a resistive temperature sensor, both connected in series with a dielectric heat-conductive intermediate layer, allowing for real-time temperature measurement to correct for temperature effects and eliminate directional sensitivity, using polycrystalline lanthanum-strontium-manganese oxide and platinum films respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetoresistive sensors are used to measure magnetic field, then magnetic field measurement capability is achieved, but measurement precision deteriorates due to temperature dependence and directional sensitivity
Solution Approach 1:
The device segments the measurement function into two independent sensors: a magnetoresistive sensor for magnetic field detection and a resistive temperature sensor for temperature detection. This segmentation allows each sensor to specialize in one measurement, eliminating the temperature dependence and directional sensitivity issues that affect single-sensor systems.
Solution Approach 2:
The patent introduces a dielectric heat-conductive intermediate layer as a mediator between the magnetoresistive and temperature sensors. This intermediate layer thermally couples the sensors to achieve consistent temperature measurement while maintaining electrical isolation, enabling accurate temperature compensation of the magnetoresistive sensor output.
2Stability of the object's composition
If two magnetoresistive sensors are used to reduce temperature dependence, then temperature stability improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of using two complex magnetoresistive sensors with different temperature dependencies, the patent copies only the temperature sensing function using a simple resistive temperature sensor. This copying approach maintains temperature stability while dramatically simplifying device structure and manufacturing, as the resistive sensor requires no magnetic field sensitivity calibration.
3Temperature
If magnetoresistive sensors are used for wide temperature range measurement, then measurement coverage expands, but measurement precision deteriorates due to rapid temperature changes
Solution Approach 1:
The patent implements feedback by continuously measuring temperature with the resistive temperature sensor and using this temperature information to compensate the magnetoresistive sensor output. This feedback mechanism enables accurate magnetic field measurement across wide temperature ranges and during rapid temperature changes, as the system actively adjusts for temperature effects in real-time.
4Measurement precision
If magnetoresistive films are carefully matched for use in one sensor, then measurement accuracy improves, but manufacturing complexity and time increase
Solution Approach 1:
The patent copies the temperature sensing function using a simple resistive temperature sensor instead of requiring carefully matched magnetoresistive films. This eliminates the need for complex film matching procedures, significantly improving manufacturing efficiency while maintaining measurement accuracy through temperature compensation.
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 solution simplifies manufacturing, expands the operating temperature range, and improves measurement accuracy, especially during rapid temperature changes, enabling precise scalar magnetic field measurements in compact devices.
Implementation Method 1
a thin polycrystalline material film (1) whose electrical resistance varies depending on the magnetic field and temperature
Implementation Method 2
a temperature-sensitive metal thin film (6) which is insensitive to the magnetic field and to which connecting leads are attached for connecting a power source so that to form a series electrical circuit through said temperature sensitive resistive thin metal film
Implementation Method 3
separated one from the other by a dielectric heat-conductive intermediate layer (10)
Data Source
Figure 1a~1c
Figure 2a~2b
AI summary
The invention relates to measuring instruments, used to measure a magnetic field. It can be used in measuring, controlling and monitoring systems where constant or variable scalar magnetic flux density (magnetic induction) measurements are taken. The device transforms the magnetic induction values into an electrical signal indicating the resistance change using a thin magnetoresistive manganite film sensor. In order to compensate the temperature errors, the device is provided with resistive temperature sensor comprising a thin temperature-sensitive metal film, which is insensitive to the magnetic field for determining the temperature in real time. The thin films of the two sensors are parallel to each other, face one another and separated by a thin layer of heat conductive dielectric thermally softened compound.