光楔 meaning in English

(optical) wedge

When the density step wedge has been properly exposed, the film is then processed .
当密度阶梯光楔被正确曝光后，即把胶片冲洗出来。
A sample of each coating is exposed on an eastman 1b sensitometer and to a wedge spectrograph .
各涂层样品用1B感光仪对着光楔摄谱仪曝光。
Verification regulation of working standard equipment for optical density
光楔密度工作基准装置检定规程
Specification for reflection - reducing coating of instrument windows and lighting wedges
仪表窗口与光楔降低反射涂层规范
Optical wedge micrometer
光楔测微器

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