Measurement of Powder Level in the Cylinder Using Sound : Comparison between Numerical Analysis and Experiments

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  • 204 音響を利用した容器内粉体レベルの測定 : 数値解析値と実験値の比較

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This paper deals with the development of a new method for Measurement of powder level in the cylinder. For monitoring of automated filling processes of cartridges in a series production a new measurement method was developed which allows to detect rapidly incorrect products and to improve the process capability by the use of this method. The aim of this research work is to measure the level of powder in a cartridge without contacting the powder. The powder is a mixture of solid particles and air, and therefore porous media from the viewpoint of acoustics. As above, the inside of the cartridge, which is filled with powder, is an acoustic system including porous media. The here developed measuring method use the relationship between amount of powder in the cartridge and the characteristics of the transfer function of the acoustic system. The acoustic characteristic of the powder, which is used for the theoretical analysis and FEM was also measured.

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