| 摘要 |
a sensing unit(100) connected with a basin(200) by a tube(220); a dynamic pressure chamber(180) whose pressure changes along with the displacement of a rubber membrane(170); a static pressure chamber(160) having constant pressure; an white reflector(130) on the upper center of the rubber membrance(170); and a light receiving device(140) and a light emitting element(150) right up the white reflector(130). As water level rises, the inner pressure of the tube(220) increases and the pressure of the dynamic pressure chamber(180) increases. Then the rubber membrane(170) rises and the white reflector(130) rises along. Because the output of the light emitting element(150) is constant and that of the light receiving device(140) increases in inverse proportion to the distance from the white reflector(130), the output of the light receiving device(140) increases. The output turns into signals to display a water level.
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