Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7071452 | Self-calibrating photoelectric control system A self-calibrating photoelectric control system for use in a checkstand to control the starting and stopping of a conveyer belt utilized to move products closer to a checkout clerk. The self-calibrating photoelectric control system including a light source for emitt... | 07/04/2006 |
| 6950778 | Programmable photoelectric sensor and a system for adjusting the performance characteristics of the sensor A programmable photoelectric sensor and a system for programming/controlling the photoelectric sensor and for monitoring the performance of the photoelectric sensor. The system includes a processor coupled to the photoelectric sensor, which is operative for generati... | 09/27/2005 |
| 6373044 | Photoelectric sensor having a hysteresis control circuit A photoelectric sensing circuit for adjusting the hysteresis of a photosensor. The photoelectric sensing circuit includes a photosensor capable of receiving light and generating an output signal indicating the amount of light incident on said photosensor.... | 04/16/2002 |
| 5621205 | Photoelectric sensor having an enhanced dynamic range control circuit The disclosed invention is a photoelectric sensor that is capable of resolving difficult low contrast sensing tasks by adjustment of the sensor's light source intensity, so as to prevent dark state saturation and extend the overall dynamic range of the se... | 04/15/1997 |
| 4644341 | Contrast indicating arrangement in photoelectric sensing systems A photoelectric sensing system, the adjustment of which is facilitated by the incorporation therein of a contrast indicator with a display in the form of an array of light emitting diodes (LEDs) controlled by a driver circuit which is arranged for success... | 02/17/1987 |
