乳剂涂布过程中会产生如凝块、脱涂、斑点、条道等各种弊病。其中纵向条道对胶片质量的影响最大。由于片基种类不同,所产生的纵向条道还可能会导致出现其它弊病。产生纵向条道的感光材料,在显影时,条道两边产生明显的密度差,为此,在涂布过程中如产生纵向条道可以很快检测出来,同时应采取防止方法。虽然在片基的横向上也产生不规则的病变,但是一般不向旁扩展,仅在纵向上形成狭长的条道。根据上述的特点,过去在检测纵向条道时,是在涂布后,用红外光均匀地照射乳剂层,通过光电元件捕捉照射在乳剂层的透射光量,以检测光 Emulsion coating process will produce such as clots, Tu Tu, spots, roads and other ills. Among them, vertical strips have the most influence on film quality. Due to the different types of substrates, the resulting longitudinal bar may also lead to other disadvantages. The photosensitive material that produces the longitudinal track, when developing, has obvious density difference on both sides of the track. For this reason, longitudinal track can be detected quickly during the coating process, and the prevention method should be taken at the same time. Although irregularities are also produced in the transverse direction of the base, it generally does not spread sideways, forming long, narrow channels in the longitudinal direction. According to the above-mentioned features, in the past, when detecting longitudinal stripes, the emulsion layer was uniformly irradiated with infrared light after coating, and the amount of transmitted light irradiated to the emulsion layer was captured by the photovoltaic element to detect light