Plate type capacitance sensor and liquid level measurement system
A capacitive sensor and liquid level measurement technology, which is applied in the direction of liquid level indicators for physical variable measurement, can solve the problems of measurement accuracy, liquid level measurement, and edge effects that cannot be ignored, so as to improve measurement accuracy, Reduce the probability of occurrence and avoid the effect of hanging on the wall
Active Publication Date: 2015-12-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
The additional capacitance generated due to the edge effect makes the actual capacitance value greater than the ideal capacitance value. If you directly use the ideal parallel plate capacitance formula when the edge effect is ignored, there will be errors in the result, so the influence of the edge effect cannot be ignored.
The edge effect of the diagonal parallel plate will have a greater impact on the liquid level measurement, especially when the liquid level is at the highest or lowest position, the edge effect of the parallel plate will have a greater impact on the measurement accuracy
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[0032] Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made during the development of any such actual implementation in order to achieve the developer’s specific goals, for example, compliance with system and business-related constraints, and these The restriction conditions may vary depending on the implementation. In addition, it should also be understood that although the development work may be very complicated and time-consuming, for those skilled in the art who benefit from the present disclosure, such development work is only a routine task.
[0033] Here, it should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or proc...
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The invention provides a plate type capacitance sensor and a liquid level measurement system used for measuring the liquid level in an LNG vehicle-mounted bottle. The plate type capacitance sensor comprises a first right trapezoid pole plate, a second right trapezoid pole plate and a rectangular pole plate, wherein the first and second right trapezoid pole plates have same shapes; when the plate type capacitance sensor is used, the surfaces of the first and second right trapezoid pole plates are positioned on the same plane, the inclined edges of the first and second right trapezoid pole plates are opposite and are arranged in parallel, and the upper and lower bottom edges of the first and second right trapezoid pole plates are respectively parallel to the liquid level; the upper bottom edge of the first right trapezoid pole plate and the lower bottom edge of the second right trapezoid pole plate are positioned on the same straight line; the surface of the rectangular pole plate is parallel to and opposite to the surfaces of the first and second right trapezoid pole plates. Due to the technology provided by the invention, the measurement error caused by the plate type capacitance edge effect can be eliminated.
Description
Technical field [0001] The invention relates to liquefied natural gas technology, in particular to a plate-type capacitive sensor and a liquid level measurement system for liquid level measurement in a LNG vehicle-mounted bottle. Background technique [0002] Liquefied natural gas (LNG) vehicles are developing rapidly. In order to ensure the safe and reliable driving of vehicles, drivers need to grasp the use of LNG in real time to avoid some accidents. In order to display the height of the liquid level in the LNG vehicle-mounted bottle in real time, a liquid level detector is usually provided. The liquid level detectors currently used include: a sensor device installed in the LNG vehicle-mounted bottle, the sensor device is connected with a signal transmitter, and the signal transmitter is connected with the liquid level display. The sensor used in the LNG vehicle-mounted bottle is used as the detector in the The main components are installed in the car bottle. There is a new ...
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IPC IPC(8): G01F23/26
Inventor 陈树军付越王泽夏莉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)