An optical grid - point field - measuring apparatus for the determination of the density values (opacities) of photographic negative.

• 1. 照相底片处理装置及用其处理照相底片的方法 [P] . 中国专利： CN1077696C . 2002.01.09
• 2. 用于测量地层密度值的测量装置及其测量方法 [P] . 中国专利： CN111119871A . 2020-05-08
• 3. Method and means for determining estimated relative exposure values from optical density values of photographic media [P] . 美国专利： US6882451B2 . 2005-04-19

  机译： 从照相介质的光密度值确定估计的相对曝光值的方法和装置

• 4. Simultaneously measuring optical density and granularity of photographic film - using self-scanning CCD detector with small aperture as densitometer and using diffuse optical density as mean value and RMS of grain as standard deviation of all micro-densities [P] . 德国专利： DE4205808A1 . 1993-09-02

  机译： 同时测量胶卷的光密度和颗粒度-使用小孔径的自扫描CCD检测器作为密度计，并使用漫射光密度作为平均值和颗粒的RMS作为所有微密度的标准偏差

• 5. Determination of extreme density values of a transported strip of photographic originals [P] . 美国专利： US4176964A . 1979-12-04

  机译： 确定传送的照相原件带的极限密度值

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• 3. 水三相点自动复现装置的研制及水三相点温度测量的研究 [A] . 杨金环 . 2010