1.前言近几年来,我国感光材料工业迅速发展,各种感光材料在工农业及人民生活中得到广泛使用。在产品质量的控制及性能测试,应用研究及新产品开发中,感光材料光学密度的计量是一项十分重要的基础工作。我国目前有两个厂家(广州金星仪器厂,上海险峰电影机械厂)生产透射式与反射式密度计,其所生产的密度计,都是手工测量,直读数字显示,没有数字信号的输出口,不能直接与计算机联接。 1. Introduction In recent years, the rapid development of China’s photosensitive materials industry, all kinds of photosensitive materials in the industrial and agricultural use and people’s lives are widely used. In the control of product quality and performance testing, application research and new product development, the measurement of optical density of photosensitive material is a very important basic work. China currently has two manufacturers (Guangzhou Venus Instrument Factory, Shanghai Xianfeng Film Machinery Factory) production of transmissive and reflective density meter, the density meters produced by them are manual measurement, direct reading digital display, there is no digital signal output , Can not be directly connected with the computer.