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Novel capacitive liquid level sensor based on capacitance calculation principle and application thereof

A liquid level sensor and a technology for calculating capacitance, which is applied in the direction of liquid level indicators for physical variable measurement, can solve the problems of reduced accuracy and achieve the effect of improved accuracy

Active Publication Date: 2014-07-23
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of processing, assembly and other errors, the current capacitive liquid level sensor has an accuracy of up to 0.1%, and the accuracy will be reduced in an ultra-low temperature environment.

Method used

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  • Novel capacitive liquid level sensor based on capacitance calculation principle and application thereof
  • Novel capacitive liquid level sensor based on capacitance calculation principle and application thereof
  • Novel capacitive liquid level sensor based on capacitance calculation principle and application thereof

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Embodiment Construction

[0018] Such as figure 1 As shown, the new capacitive liquid level sensor is based on the principle of calculated capacitance, which is a new theorem of electrostatics proved by D.G.Lampard and A.M.Thompsion from Australia in 1956. It points out that when an infinitely long conductive cylinder with an arbitrary cross section is divided into four parts by infinitely small gaps at a, b, c, and d, the capacitance C between ab and cd 1 Capacitance C between ad and bc 2 Satisfy:

[0019] 2 - C 1 C 0 + 2 - C 2 C 0 = 1

[0020] where C 0 =(ε 0 ε r ln2) / π is a constant, ε 0 is the vacuum permitt...

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Abstract

The invention discloses a novel capacitive liquid level sensor based on the capacitance calculation principle and the application thereof. The novel capacitive liquid level sensor comprises a shielding cover, an insulator, a metal layer, an upper packaging piece, a circuit board, a special metal pin and a lower packaging piece. The insulator is shaped like a barrel, and the outer surface of the insulator is plated with the metal layer. The shielding cover is coaxial with the insulator and located on the periphery of the insulator, and the insulator and the shielding cover are assembled together through the upper packaging piece and the lower packaging piece. A positioning and clamping surface is arranged outside the upper packaging piece, and the signal processing circuit board is arranged inside the positioning and clamping surface. Small holes through which liquid can flow are evenly distributed in the shielding cover. Based on the capacitance calculation principle, the precision of the capacitive liquid level sensor is only influenced by the relative dielectric constant of the liquid to be measured and the relative dielectric constant of air and is expected to be improved than that of a traditional capacitive liquid level sensor, and the novel capacitive liquid level sensor is also suitable for measurement of the level of ultralow-temperature liquid.

Description

technical field [0001] The invention belongs to the technical field of metering and testing, and relates to a novel capacitive liquid level sensor based on the principle of calculated capacitance and its application. Background technique [0002] Liquid level measurement is widely used in various fields such as production and life, especially in high-tech fields such as aviation, aerospace, and biology. Accurate liquid level measurement is of great significance. These fields often need to measure low-temperature liquids, such as liquid hydrogen, liquid oxygen, liquid methane, etc. These liquids have the characteristics of low boiling point, low density, and easy vaporization. Due to the special use environment and requirements, liquid level sensors not only require high precision, It also requires the ability to withstand harsh environments. [0003] At present, there are many methods for liquid level monitoring and measurement of cryogenic liquids. Commonly used methods in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
Inventor 李东升王梅宝胡佳成于航
Owner CHINA JILIANG UNIV
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