| 摘要 |
A method of detecting foreign matters mixed in a liquid filled in a transparent receptacle, which comprises bringing said receptacle to a sudden stop after rotating it at high speed, subjecting the receptacle to light by means of a projector disposed outside the receptacle to thereby expose foreign matters floating in the liquid contained in the receptacle to rays of light, making the ray-receiving surface of a ray receiver disposed on the opposite side of the projector relative to the receptacle receive the flux of light passing through the receptacle by way of light-focusing glass fibers provided for the ray receiver, and detecting foreign matters mixed in the liquid on the basis of the decrease or increase in the amount of rays received.
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