不同温度下电阻热噪声测量方案与电磁屏蔽的改进

doi:10.14139/j.cnki.cn22-1228.2023.02.012

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摘要

电阻热噪声测量需要隔离环境噪声对测量的干扰。通过远程控制扫频噪声测量发现教学实验室即使在无人时仍有明显特征的环境噪声；另一方面，位于电阻旁边的热电偶即使在非测量状态下也会引入噪声。为此，高屏蔽能力的变温样品盒成为变温测量电阻热噪声的关键。本文研制一款用于实验教学的样品盒，测温热电偶设置在样品盒外，但与电阻保持良好热接触；进一步结合锁相放大器Ａ?Ｂ共模输入和输入带宽修正，获得较好的实验效果。

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	申玉宽
	何振辉

关键词: 热噪声环境噪声屏蔽锁相放大器变温测量实验教学

Abstract:

Resistance therma noise measurement needs to shield the environmental noise interference from themeasurement.Through remote measurement of noise with a frequency sweep mode,it is found that there wasobvious characteristics of environmental noise higher in strength than the thermal noise in the teachinglaboratory even nobody was there.On the other hand,the thermal couples local near the resistor to measure itstemperature can introduce environmental noise to the measurement even it was in the shutdown state.Therefore ,a sample box with capacities of high noise-shielding and temperature-measurement of the resistor atthe same time becomes the key to the resistance thermal noise measurement at variable temperatures.Combinedwith the A-B common mode input of a lock-in amplifier and the input bandwidth correction ,a sample box withthe thermal couple outside the shielding box but with good thermal contact with the resistor is developed forteaching experiment,which produces desired result.

Key words: thermal noise environmental noise shielding lock-in amplifier measurement in varyingtemperature experimental teaching

出版日期: 2023-04-25 发布日期: 2023-04-25 整期出版日期: 2023-04-25

ZTFLH:

O 414.1

引用本文:

申玉宽, 何振辉 . 不同温度下电阻热噪声测量方案与电磁屏蔽的改进 [J]. 大学物理实验, 2023, 36(2): 54-58.
SHEN Yukuan, HE Zhenhui. Improvement of Resistance Thermal Noise Measurement andElectromagnetic Shielding at Different Temperatures . Physical Experiment of College, 2023, 36(2): 54-58.

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http://dawushiyan.jlict.edu.cn/CN/10.14139/j.cnki.cn22-1228.2023.02.012 或 http://dawushiyan.jlict.edu.cn/CN/Y2023/V36/I2/54

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