A third harmonic measurement device and method for measuring a wide thermal conductivity range

CN122922142APending Publication Date: 2026-10-16NANJING NORMAL UNIVERSITY
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Patent Information

Application Number
CN202611427968.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-09-15
Publication Date
2026-10-16

AI Technical Summary

Technical Problem

[0005]本发明的目的是为了解决现有技术中测量宽热导率时存在的对交流电流源量程和金属探测器的尺寸及电阻要求较高，对不同热导率范围需要更换加热电极或调整测试条件，操作繁琐，难以在同一结构下实现宽范围的连续、高精度测量的缺点，而提出的一种可测量宽热导率范围的三次谐波测量装置及其方法，实现宽范围热导率的精准高效测量

Benefits of technology

[0034]Compared with existing technologies, the advantages of this invention are as follows: This invention improves the signal-to-noise ratio by processing the voltage signal through a differential amplification measurement module. This significantly enhances its advantages when measuring materials with high thermal conductivity. High thermal conductivity materials dissipate heat quickly, have low temperature rise, and weak third harmonic signals, requiring greater electrical power to generate sufficient heat from the heat source. This necessitates setting a larger current value or designing a metal detector with a larger resistance. This invention utilizes a differential amplification module, making the fundamental voltage difference between the two input terminals of the differential module as close to zero as possible. It can use various types and ranges of lock-in amplifiers and eliminates the need to adjust the size and resistance of the metal detector. Operation is simple, and a wide range of continuous, high-precision measurements can be achieved under the same measurement structure, saving time and cost in the manufacturing of the measuring device.

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Abstract

The application discloses a kind of three harmonic measurement devices and methods of measurable wide thermal conductivity range, it is related to material thermal conductivity measurement technical field;The device includes metal detector, direct current power supply, differential amplification module, high-precision alternating current source, lock-in amplifier, variable resistance and capacitor.The method is directly deposited on the sample to be measured metal detector, when measuring, different frequency current is passed into the loop of metal detector and variable resistance, lock-in amplifier is used to collect voltage signal after differential amplification module processing, so as to calculate the thermal conductivity of sample.The application realizes the measurement of wide thermal conductivity material, overcomes the limitation of measuring range of instrument, improves the signal-to-noise ratio of voltage signal, easy to operate, in the same measurement structure can realize wide range of continuous, high-precision measurement, saves the production time and cost of measuring device.
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