Laser Heating System for High-Temperature Permanent Magnet Measurement
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Solution Overview
Problem
Existing methods for measuring the magnetic performance of permanent magnets at high temperatures are limited by low heating speed, energy inefficiency, and interference from stray magnetic fields, which affect measurement accuracy.
Innovation Solution
A device and method utilizing a laser heating system with high-temperature-resistant heat absorbing sheets, temperature sensors, and adjustable laser beams to rapidly and efficiently heat the sample, minimizing interference and ensuring accurate magnetism measurements up to 700°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating sheet is used to heat the sample, then the sample can be heated to high temperature, but the heating temperature is limited to not exceed 200°C due to the heating limit of resistance wire or heating sheet
Solution Approach 1:
The patent replaces the traditional resistance wire or heating sheet (electrical heating system) with a laser heating system. The laser beam directly irradiates the sample to achieve high-temperature heating without the temperature limitations of resistance wires. This substitution enables heating temperatures to exceed 200°C and reach much higher ranges suitable for measuring permanent magnet materials.
Solution Approach 2:
The patent changes the heating method from electrical resistance heating to optical laser heating. By changing the heating parameter from electrical current to laser energy, the system can achieve significantly higher temperatures. The laser power and irradiation time can be adjusted to control the heating temperature, enabling measurements at temperatures well above 200°C.
2Temperature
If a heating current is used in the heating sheet, then the sample can be heated, but a stray magnetic field is generated which affects measurement results
Solution Approach 1:
The patent replaces the electrical heating system (heating sheet with current) with a laser heating system. Since lasers are optical devices, they do not generate magnetic fields during operation. This eliminates the stray magnetic field interference that would otherwise affect the measurement of magnetic properties of the permanent magnet material.
Solution Approach 2:
The patent extracts and removes the source of magnetic field interference (the heating current and heating sheet) from the measurement system. By using laser heating instead, the harmful magnetic field generation is completely eliminated while retaining the necessary heating function.
3Temperature
If a heating sheet is used to heat the sample, then the sample can be heated, but the heating efficiency is low and the time required is long
Solution Approach 1:
The patent replaces the inefficient thermal conduction heating method (heating sheet) with direct optical heating using laser beams. The laser energy is directly absorbed by the sample, converting optical energy to thermal energy rapidly at the surface and throughout the sample volume. This direct heating mechanism achieves much higher heating rates and reduces the time required to reach target temperatures.
Solution Approach 2:
The laser heating system can operate in pulsed or continuous modes, allowing flexible control of heating rates. By adjusting the laser power and pulse duration, the system can rapidly heat the sample to the desired temperature, significantly improving heating efficiency compared to the gradual thermal diffusion process of heating sheets.
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 method achieves high heating speed and energy efficiency, providing accurate measurements of magnetism without affecting the results, enabling reliable assessment of permanent magnets under high-temperature conditions.
Implementation Method 1
the laser device emits a laser beam, and the laser beam is divided into two laser beams by the light beam controller to irradiate the front and rear surfaces of the sample to heat the sample
Implementation Method 2
heat absorbing sheets are respectively fixed on front and rear surfaces of the sample
Implementation Method 3
the temperature sensors are arranged on the heat absorbing sheets and are used for measuring temperatures of the heat absorbing sheets
Implementation Method 4
the magnetism measurement unit is respectively connected with a magnetic field measurement probe and a magnetic induction intensity measurement coil
Implementation Method 5
Device and method for measuring magnetism of permanent magnet material at high temperature
Data Source
AI summary
A device for measuring magnetism of a permanent magnet material at a high temperature includes a laser device, a power controller, a light beam controller, a temperature controller, a magnetism measurement unit, temperature sensors, and electromagnet pole heads. The electromagnet pole heads are divided into an upper piece and a lower piece for clamping upper and lower surfaces of a sample. Heat absorbing sheets are respectively fixed on front and rear surfaces of the sample. Temperatures of the heat absorbing sheets are measured by the temperature sensors. The sample is heated by laser, and the temperature controller is used to adjust a ratio of light beams of the power controller and the light beam controller irradiating the heat absorbing sheets on the front and rear surfaces of the sample, thus adjusting the temperatures of the heat absorbing sheets. The magnetism of the sample is measured using the magnetism measurement unit.