ビン内液面検査機

抄録

A new method has been developed for detecting the height of liquid level in a bottle. Based on the fact that bottled liquid column converges light as a cylindrical lens, while the space and bubbles avove the liquid surface do not, the method utilizes the difference between the refractive indices of the media above and below the liquid surface, which is picked up by a double beam oytical system. This method, free from the existence of floating bubbles, can obtain the level height more conveniently than by the conventional method based on light transmission factor.
With the results of basic experiments, calculations and experiences of plant tests, an inspection apparatus using the phototube which makes the convergence of light correspond to the electric pulse existence was made for brewing industry. Optimum sizes of optical systems, special phototubes which have been developed for this apprratus and electronic circuits which consist of pulse shaping circuit, differentiating circuit, bottle transmission compensating circuit and anticoincidence circuit, serve to eliminate the inevitable error actions of the apparatus. In addition to the report on this apparatus, examples of experimental data are given in this paper.