Realization Method of Measuring Circuit for Subsection Capacitance Liquid Level Sensor
A technology of capacitive liquid level and measurement circuit, which is applied in the direction of liquid level indicator for physical variable measurement, can solve the problems of liquid level measurement function failure, real liquid level information cannot be determined, high real-time requirements, etc., and achieve strong anti-interference ability , Improve the reliability of use and expand the scope of application
Active Publication Date: 2016-05-11
BEIJING INST OF AEROSPACE TESTING TECH +1
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Problems solved by technology
[0005] (2) High real-time requirements
For the non-stationary change state similar to the above, the liquid level measurement function based on the calculation of the number of triangular waves will fail, and the real liquid level information will not be determined
[0007] At present, various known methods cannot better solve the above existing problems.
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[0020] In order to understand the technical means, innovative features, objectives and effects of the present invention, the following uses the segmented liquid level meter as an application sensor, combined with specific diagrams to further illustrate the present invention.
[0021] In order to facilitate the understanding of the content of the present invention, a necessary introduction is made to the sectioned capacitive liquid level sensor.
[0022] Such as figure 1 As shown, the basic structure of the segmented capacitive liquid level sensor is the same as that of the ordinary capacitive liquid level sensor. A typical structure is composed of a coaxial metal inner tube and an outer tube, but the outer tube is divided into several parts of the same height and insulated from each other. Sections (the number is usually even in order to achieve complete symmetry), and then connect the odd-numbered sections into one group, and the even-numbered sections into another group. They and...
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The invention provides a circuit measuring achieving method for a segmentation capacitor liquid level sensor. The circuit measuring achieving method comprises an alternating current excitation source, a pre-amplification unit, a summator, a subtracter, a middle amplification unit, a detector and a low-pass filter. By means of the method, strict limit in the existing method on the distance between a measured circuit and the sensor is eliminated. When the liquid level changes fast, the problem that response capacity is insufficient and only single conversion signals can be measured is solved, and application range of the segmentation capacitor liquid level sensor is expanded to a large extent.
Description
Technical field [0001] The invention relates to a sensor and measurement technology, in particular to aerospace special measurement. Background technique [0002] In the field of aerospace liquid rocket propulsion, whether it is in engine ground test or rocket flight, it is necessary to accurately grasp the real-time liquid level in the propellant tank. If the tank is calibrated for the corresponding volume at different heights, and then the output signal of the level gauge measuring circuit is analyzed within a certain period of time, the important parameter of the steady state flow rate of the propellant can also be obtained. Ma Liyao of Beijing Institute of Aerospace Test Technology and others proposed a segmented capacitive liquid level sensor. This method uses a sensor structure of subdivided straight pipe sections, combined with differential measurement technology, so that the sensor has strong temperature and pressure. Automatic compensation capability, and extremely high...
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IPC IPC(8): G01F23/26
Inventor 苏韬蔡睿于海磊管理李志刚朱子环耿卫国郑勤生田源周文怡周磊段娜于涛庄建赵晋平李薇
Owner BEIJING INST OF AEROSPACE TESTING TECH