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目前常用的边缘梯度分析法(EGA)和正弦波分析法测试胶片的模量传递函数都需要测微密度计。该仪器价格昂贵,计算费时,而且不宜用于高解象力乳剂(解象力>500线/毫米),因为它必须避免某些潜在的光
The commonly used edge gradient analysis (EGA) and sine wave analysis test the film’s modulus transfer function requires micrometer. This instrument is expensive, time-consuming and should not be used on high-power emulsions (resolution> 500 lines / mm) because it must avoid some of the potential light