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公开(公告)号：US3746864A
公开(公告)日：1973-07-17
申请号：US3746864D
申请日：1972-01-03
CPC分类号： G01N21/85
摘要： A device for sensing and controlling optical density of a fluid. The device includes a pair of tube portions of different crosssectional areas through which the fluid flows, these tube portions having walls which are transparent and which are of equal optical characteristics. A light source is provided on one side of the tube portions for directing light transversely through the fluid which flows through the tube portions, and on the other side of the tube portions there are a pair of photocells which respetively receive the light, so that one of the photocells receives light which travels through the tube portion of larger cross-sectional area with a longer path of travel through the fluid than the light received by the other of the photocells. As the optical density of the fluid increases the differential in the light received by the photocells will also increase, and this differential can be detected for achieving desired controls. The light which reaches the photocell receiving the light which has travelled through the tube portion of smaller cross-sectional area is maintained at a constant intensity by an adjacent third photocell.
摘要翻译： 用于感测和控制流体光密度的装置。 该装置包括一对流体流过不同横截面积的管部分，这些管部分具有透明且具有相同光学特性的壁。 光源设置在管部分的一侧，用于横向引导光穿过流过管部分的流体，并且在管部分的另一侧上有一对光电管，其重新接收光，使得一个 的光电管接收比较由另一个光电池接收的光更长的行程通过流体的较大横截面区域的管部分的光。 随着流体的光密度增加，由光电池接收的光的差异也将增加，并且可以检测该差分以实现期望的控制。 接近已经穿过较小横截面积的管部分的光的光电池的光通过相邻的第三光电池保持恒定的强度。
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