| 摘要 |
The machine includes a multiple peak optical filter in front of the photo sensitive devices for passing a first defined light frequency spectrum within the first colour frequency spectrum and a second defined light frequency spectrum within the second colour frequency spectrum. The first photo-sensitive device produces an output which is proportional to the light radiation in the first defined light frequency spectrum. The second photo-sensitive device producing an output which is proportional to the light radiation in the second defined light frequency spectrum. An electronic processing device is connected to the photo optical detectors for producing an ejection signal as determined by the presence of at least one set combination of first and second device outputs. |
