该仪器（型号：HO-ED-D-02）适用于物理研究生和研究生课程。在这里，使用安装在平移台上的检测器仔细研究了衍射图样。该设备由1.2米长的光轨以及托架，光学元件和光机械组成。在导轨的一端，安装了带有探测器的X-平移台，在另一端，将激光保持在运动学支架上。附在导轨上的线性刻度尺使长度测量变得容易和方便。激光头和检测器平台都安装在带锁的轨道车上，而后者又可以方便地安装在轨道上的任何位置。
Experiment Examples
Diffraction of light by single slit
The diffraction equation (condition for minima) is,
Sin θm = m λ / d
Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.
From this we can find out the slit width d as
d = m λ / Sin θm
Diffraction of light by double slit
The diffraction equation (condition for maxima) is,
Sin θm = m λ / d
Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.
From this we can find out the slit width d as
d = m λ / Sin θm
Diffraction of light by single wire
The diffraction equation (condition for maxima) is,
Sin θm = m λ / d
Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.
From this we can find out the slit width d as
d = m λ / Sin θm
Diffraction of light by cross wire
The diffraction equation (condition for maxima) is,
Sin θm = m λ / d
Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.
From this we can find out the slit width d as
d = m λ / Sin θm
Diffraction of light by wire mesh
The diffraction equation (condition for maxima) is,
Sin θm = m λ / d
Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.
From this we can find out the slit width d as
d = m λ / Sin θm
Diffraction of light by transmission grating
The diffraction equation (condition for maxima) is,
Sin θm = m λ / d
Where d is the slit width, m is the order, λ is the wavelength of laser used and θm is the angle subtended within the central maximum and mth order minimum.
From this we can find out the slit width d as
d = m λ / Sin θm
Diffraction of light by circular aperture (Pinhole)
Radius of the Airy’s disc,
x = ( 1.22 l λ ) / a
where,
a = Diameter of the aperture (pinhole),
l = Distance between the pinhole and the Screen,
λ = Wavelength of light,
x = Radius of the Airy’s disc
Thus we can find the diameter of the aperture (pinhole) using the equation
a = ( 1.22 l λ ) / x
特征
高测量精度，清晰清晰的衍射图样
衍射元件固定在金属外壳上，易于安装
顺畅开启，光源使用寿命长
可靠且负担得起
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