Capacitance type digital material-level sensor and its measurement method

A capacitive and sensor technology, applied in the direction of liquid level indicators for physical variable measurement, can solve the problems of large errors in the measurement of material levels, achieve the effects of simple, compact and reasonable structure, novel measurement methods, and enhanced anti-interference ability

Inactive Publication Date: 2008-09-17
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] The problem to be solved by the present invention is that the existing capacitive level sensor and its measurement method, because its structure and method adopts analog signal measurement, there is a problem of large error when measuring the level

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  • Capacitance type digital material-level sensor and its measurement method
  • Capacitance type digital material-level sensor and its measurement method
  • Capacitance type digital material-level sensor and its measurement method

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Embodiment Construction

[0017] The technical solutions of the present invention can be further described in detail below in conjunction with the accompanying drawings. This embodiment is a further detailed description of the present invention and does not limit the present invention in any way.

[0018] The structure of the capacitive digital level sensor of the present invention can be made into a variety of plate structures with inductive shapes, such as: flat plate structure, "V" shaped plate structure, "U" shaped plate structure and two parallel plate structure, etc. The sensing distance of the planar plate structure is 180 degrees, the sensing distance of the “V”-shaped plate structure is 0-180 degrees, and the sensing distance of the “U”-shaped plate structure and two parallel plate structures is two poles. The distance that the board can sense.

[0019] The setting of the pole plate of the capacitive digital level sensor of the present invention is a variety of settings that the two pole plat...

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Abstract

The invention discloses a capacitor digital level sensor, characterized in that an electrode plate of a plurality of capacitors is formed by micro-capacitance detection integrated circuit or two or above electrode plates connected by a lead; the measuring method is that fixedly arranging the electrode plates in the detected material, two electrode plates forming a plurality of capacitors, each of which having a corresponding micro-capacitance detection circuit. Output of the electrode plates is zero or one according to alternation of the capacitance, obtaining the digital level by scanning circuit statistics. The invention is compact and reasonable in structure, convenient, rapid and accurate in use, which solves the problem of present level measurement that measuring error is greater caused by effect of factors such as temperature, humidity and capacitance value accumulation error, and enhances anti-inference capacity of the sensor greatly, and improves stability and reliability of the level measurement, in particular applied to directly digital precise measurement of powder or small particle solid, liquid.

Description

technical field [0001] The invention relates to a capacitive level sensor and a measuring method thereof, in particular to a capacitive digital level sensor which senses and measures the level through two capacitive plates and a measuring method thereof. Background technique [0002] The existing measurement method of capacitive level sensor is to use the capacitive sensor to convert the change of the position of the measured medium into the change of capacitance, and then obtain the value of the corresponding level according to the size of capacitance. There are many factors that cause capacitance changes, such as changes in the area of ​​the capacitor plates, changes in the spacing of the capacitor plates, and changes in the properties of the medium between the capacitor plates will cause changes in the capacitance. Capacitive level measurement sensors have various structural forms, such as: suitable for holding insulating materials in conductive containers, the capacitor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
Inventor 周义仁吕青
Owner TAIYUAN UNIV OF TECH
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