全息照相显影密度仪

Instrument of Developing Density in Holograph

根据光学原理推导出测量显影密度的公式.根据全息照相的特点，正确选择光源和光接收器，并合理设计线路。制作一台全息照相显影密度仪，该仪器在暗室中，显示清晰，使用方便，对提高工作效率，节省材料，制作优良的全息图有很好作用。

In this paper, based on optical principle, a formula of measuring developing density is deduced. According to the feature of hologram, light source and sensor is choosed properly, and electronic circuit is devised rationally. The instrument has features of clear digital display and easy operating in dark room. It raises working efficiency, saves material, and has good effect on taking fine hologram.