| 通过恰当控制入射光强度来准确测量普朗克常量 |
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| 引用本文： | 陈若辉,杜勇慧,张志国.通过恰当控制入射光强度来准确测量普朗克常量[J].北华大学学报(自然科学版),2015,16(3):296-301. |
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| 作者姓名： | 陈若辉 杜勇慧 张志国 |
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| 作者单位： | 北华大学物理学院,吉林 吉林,132033;北华大学物理学院,吉林 吉林,132033;北华大学物理学院,吉林 吉林,132033 |
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| 基金项目： | 吉林省教育厅科学技术研究项目 |
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| 摘 要： | 为了消除因光电流曲线的变化率的差异对确定截止电压的影响,提出了通过恰当地控制入射光强度,使不同频率的光电流曲线的变化率相同;为了消除光电流曲线的起始位置和线性部分的倾斜程度不同对确定截止电压的影响,提出了采用"平行等距法"确定截止电压;为了抑制漂移对测量的影响,提出了适当降低仪器的灵敏度,提高仪器稳定性的测量原则.实验结果表明:采取这些措施,测量普朗克常量相对误差由2.5%可降到0.7%.
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| 关 键 词： | 测量 入射光强度 曲线变化率 截止电压偏差 相对误差 零点漂移 |
Accurate Measurement of Planck Constant by Controlling Intensity of Incident Light |
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| Chen Ruohui,Du Yonghui,Zhang Zhiguo.Accurate Measurement of Planck Constant by Controlling Intensity of Incident Light[J].Journal of Beihua University(Natural Science),2015,16(3):296-301. |
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| Authors: | Chen Ruohui Du Yonghui Zhang Zhiguo |
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| Abstract: | In order to eliminate the influence of differences from rate of change in photocurrent curve on cutoff voltage,the rate of change in photocurrent curve with different frequencies remains the same by proper controlling of incident intensity."Parallel isometry method"is put forward to obtain cutoff voltage so as to eliminate the influences on cutoff voltage from changing of initial position and inclination of photocurrent curve. The measurement principle of appropriately reducing sensitivity and accordingly improving stability of instrument proposed to restrain the effect of wander on measurement. The result indicated that the relative error of Planck constant decreased from 2. 5% to 0. 7% by measures. |
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| Keywords: | measurement incident intensity change rate of curve deviation of cut-off voltage relative error zero point drift |
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