Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Single Slit Diffraction Intensity

单缝衍射强度

Under the Fraunhofer conditions, the wave arrives at the single slit as a plane wave. Divided into segments, each of which can be regarded as a point source, the amplitudes of the segments will have a constant phase displacement from each other, and will form segments of a circular arc when added as vectors. The resulting relative intensity will depend upon the total phase displacement δ according to the relationship:

在Fraunhofer条件下，波以平面波的形式到达单缝。将波分成若干段，每一段均可视为一个点源，各段的振幅将彼此具有恒定的相位位移，当这些振幅作为矢量相加时，会形成圆弧状的段。所得到的相对强度将根据总相位位移δ的关系而变化：
 Index

Diffraction concepts

Fraunhofer diffraction

Fraunhofer intensity concepts

Reference
Meyer-Arendt
Ed 4, Ch 14.
索引 衍射概念 夫琅禾费衍射 夫琅禾费强度概念 参考 Meyer-Arendt 编 Ed 4, Ch 14.
 
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Single Slit Amplitude Construction

单缝振幅构造

Under the Fraunhofer conditions, the wave arrives at the single slit as a plane wave. Divided into segments, each of which can be regarded as a point source, the amplitudes of the segments will have a constant phase displacement from each other, and will form segments of a circular arc when added as vectors. In this way, the single slit intensity can be constructed.

在Fraunhofer条件下，波以平面波的形式到达单缝。将波分成若干段，每段可视为一个点源，各段的振幅将彼此具有恒定的相位位移，并在矢量相加时形成圆弧段。这样，单缝的强度就可以被构造出来。
More detail on amplitude addition
振幅叠加的更多细节
Peak intensities
峰值强度
 Index

Diffraction concepts

Fraunhofer diffraction

Fraunhofer intensity concepts

Reference
Meyer-Arendt
Ed 4, Ch 14.
索引 衍射概念 夫琅禾费衍射 夫琅禾费强度概念 参考 Meyer-Arendt 编 Ed 4, Ch 14.
 
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Graphical Amplitudes: Single Slit

单缝衍射图样

Under the Fraunhofer conditions, the wave arrives at the single slit as a plane wave. Divided into segments, each of which can be regarded as a point source, the amplitudes of the segments will have a constant phase displacement from each other, and will form segments of a circular arc when added as vectors. In this way, the single slit intensity can be constructed.

在Fraunhofer条件下，波以平面波的形式到达单缝。将波分成若干段，每段可视为一个点源，各段的振幅将彼此具有恒定的相位位移，并在矢量相加时形成圆弧段。这样，单缝的强度就可以被构造出来。
Setup for amplitude addition, single slit
单缝衍射的振幅叠加装置
Peak intensities
峰值强度
 Index

Diffraction concepts

Fraunhofer diffraction

Fraunhofer intensity concepts

Reference
Meyer-Arendt
Ed 4, Ch 14.
索引 衍射概念 夫琅禾费衍射 夫琅禾费强度概念 参考 Meyer-Arendt 编 Ed 4, Ch 14.
 
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Single Slit Peak Intensities

单缝峰值强度

Under the Fraunhofer conditions, the wave arrives at the single slit as a plane wave. Divided into segments, each of which can be regarded as a point source, the amplitudes of the segments will have a constant phase displacement from each other, and will form segments of a circular arc when added as vectors. In this way, the single slit intensity can be constructed.

在Fraunhofer条件下，波以平面波的形式到达单缝。将波分成若干段，每段可视为一个点源，各段的振幅将彼此具有恒定的相位位移，并在矢量相加时形成圆弧段。这样，单缝的强度就可以被构造出来。
Setup for amplitude addition, single slit
单缝衍射的振幅叠加装置
 Index

Diffraction concepts

Fraunhofer diffraction

Fraunhofer intensity concepts

Reference
Meyer-Arendt
Ed 4, Ch 14.
索引 衍射概念 夫琅禾费衍射 夫琅禾费强度概念 参考 Meyer-Arendt 编 Ed 4, Ch 14.
 
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