| 摘要 |
The present invention includes a level detector having a collimator being operable to block first electromagnetic radiation having a first range of orientations with respect to the level detector from passing through. The collimator is further operable to allow second electromagnetic radiation having a second range of orientations with respect to the level detector to pass through. The level detector includes a sensor that is positioned, with respect to the collimator, such that the sensor is operable to detect magnitudes of the second electromagnetic radiation. The sensor may be further operable to convert incident photon flux associated with the second electromagnetic radiation to electrical signals. In accordance with a particular embodiment of the present invention, the level detector includes an electronic unit that is operable to detect a radiation step in the second electromagnetic radiation, based upon changes in the magnitudes of the second electromagnetic radiation.
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