Vibrating Sample Magnetometer Sweep Control Under Applied Pressure
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Solution Overview
Problem
Existing vibrating sample magnetometers fail to accurately measure the deterioration of magnetic properties in magnetic samples subjected to external pressure due to the restoration of magnetic properties when a strong magnetic field is applied.
Innovation Solution
A vibrating sample magnetometer that includes a sample housing vibrating body, an excitation electromagnet, a pressure application unit, a pressure acquisition unit, and a control device, which controls the external magnetic field and pressure to sweep the magnetic field below a specified value to avoid restoring deteriorated magnetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a strong magnetic field is applied to restore deteriorated magnetic properties, then magnetic properties are restored, but accurate measurement of deterioration cannot be achieved
Solution Approach 1:
The invention changes the magnetic field parameter by setting the sweep start value to a value smaller than the second magnetic field value (saturation field value). This parameter modification prevents the magnetic field from reaching levels that would restore deteriorated properties, thereby enabling accurate deterioration measurement while avoiding restoration effects
Solution Approach 2:
The invention applies preliminary anti-action by preemptively limiting the magnetic field sweep range before deterioration restoration can occur. By setting the sweep start value below the saturation field value, the system prevents the harmful restoration effect from happening during measurement
2Loss of information
If the magnetic field is swept to saturation to measure magnetic properties, then complete magnetic property data is obtained, but deteriorated properties are restored during sweeping
Solution Approach 1:
The invention modifies the magnetic field sweep parameters by setting the sweep start value to a specific value smaller than the second magnetic field value. This controlled parameter change allows obtaining necessary magnetic property data without reaching saturation levels that would restore deteriorated properties
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 measurement of magnetic property deterioration due to external pressure, allowing for precise evaluation of magnetic materials in devices like motors.
Implementation Method 1
an excitation electromagnet that applies an external magnetic field to the measurement sample
Implementation Method 2
a magnetic property acquisition unit that detects an induced voltage caused by vibration of the measurement sample magnetized by the excitation electromagnet
Data Source
AI summary
A magnetic property acquisition unit detects an induced voltage caused by vibration of a measurement sample magnetized by an excitation electromagnet and acquires a magnetic property that indicates a relationship between a magnetic flux density and an external magnetic field. The magnetic flux density is a sum of magnetization of the measurement sample and the external magnetic field. When acquiring the magnetic property of the measurement sample to which pressure is being applied, a control device sets a first magnetic field value as a sweep start value, and performs sweeping with a magnetic field equal to or less than the first magnetic field value. The first magnetic field value is smaller than a second magnetic field value that is acquired before the pressure is applied to the measurement sample, and corresponds to a saturation magnetic flux density of the measurement sample to which the pressure is not being applied.