棱栅（光栅+棱镜）是一种光学棱镜，在该棱镜的某一（极少出现两个）扁平（极少出现曲面）功能表面上加工有一块透射光栅。棱柵有直接的视角或者说没有波长偏移。这一特性使其能够将相机转变成摄谱仪，方法是在光路中插入棱栅。这一方式可运用至各种应用中，如天文学。通过相应地选择棱镜的刻槽密度和顶角，根据特定应用需求对棱栅的直视波长和角色散进行调整。
A Grism is a Prism That Has a Transmission Grating on One Of its Plane Surfaces. A Grism (GRating+prISM) is an optical prism which has a transmission grating fabricated onto one (rarely two) of its plane (rarely curved) functional surfaces. Grisms have a straight view or undeviated wavelength. This property allows them to transform a camera into a spectrograph by inserting the grism in the optical beam path. This can be used in various applications, e.g. astronomy. By selecting the groove density and the apex angle of the prism accordingly, the straight view wavelength and the angular dispersion of the grism can be adapted to the needs of the specific application
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