| 摘要 |
An optical gauge for measuring the level of a liquid in a container comprises an elongate, tubular member with a central bore. A light source is positioned for projecting radiant energy into the bore along a length of the tubular member. An elongate light collector is spaced from the light source and extends along the length of the tubular member for receiving radiant energy from the light source. The light collector has opposite ends and is formed such that radiant energy incident on a length of the light collector is transmitted to the light collector ends. A light blocking member is located within the bore and extends between the light source and at least a portion of the elongate light collector for blocking at least a portion of the radiant energy from the light collector. The light blocking member is movable with respect to the light collector in response to change in liquid level within the tubular member for varying the position of the radiant energy incident on the light collector to thereby vary the amount of radiant energy transmitted to the light collector ends. At least one photosensor is positioned proximal at least one of the light collector ends for detecting the amount of radiant energy transmitted thereto. With this arrangement, the amount of radiant energy received by the light collector and detected by the at least one photosensor is indicative of the liquid level.
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