| 摘要 |
To provide rapid level measurements with improved reliability, the present invention provides an apparatus and method for optically determining the level of a material through a technique for measuring the ratio of digital signals acumulated during an index interval and for modifying those signals to compensate for variations that can be caused by the shape of the beam detector signal. More particularly, the present invention provides a level detector system which includes a laser beam source which directs light to be reflected from a surface to be measured, the reflected light being directed to a stationary parabolic mirror.
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