CN220251133U - Low-cost high-sensitivity capacitive sensor - Google Patents

Abstract

The utility model provides a low-cost high sensitive capacitive sensor, includes the protective housing, the inside sealed cavity of platykurtic that forms of protective housing, the interior extension face tiling of platykurtic sealed cavity has the conducting strip, and the conducting strip passes through wire and singlechip processor electric communication. According to the utility model, a capacitance structure is formed between the conducting strip and the natural atmosphere, the liquid level change in the container can enable the capacitance loop to vibrate, and the vibration frequency change is calculated and analyzed through the singlechip processor, so that the real-time state of the liquid level is identified, the sensitivity is high, and the manufacturing cost of the sensor is low.

Description

Low-cost high-sensitivity capacitive sensor

Technical Field

The utility model relates to the technical field of sensors, in particular to a low-cost high-sensitivity capacitive sensor.

Background

Most of the existing liquid level sensors use floats to identify liquid level, part of the liquid level sensors with more precision can also use floats to identify liquid level in combination with reed pipes, and the sensors which independently use floats are low in general sensitivity and can only be used on equipment with low requirements, but the liquid level sensors with higher sensitivity at present are high in manufacturing cost and complex in structure.

Disclosure of Invention

The utility model aims to provide a low-cost high-sensitivity capacitive sensor, a capacitive structure is formed between an application conducting strip and the natural atmosphere, liquid level change in a container can enable a capacitive loop to vibrate, and a singlechip processor is used for calculating and analyzing vibration frequency change, so that the real-time state of the liquid level is identified, the sensitivity is high, the manufacturing cost of the sensor is low, and the problems raised by the background technology are solved.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a low-cost high sensitive capacitive sensor, includes the protective housing, the inside sealed cavity of platykurtic that forms of protective housing, the interior extension face tiling of platykurtic sealed cavity has the conducting strip, and the conducting strip passes through wire and singlechip processor electric communication.

Preferably, the conductive sheet is a circular thin sheet.

Preferably, the conductive sheet is a copper foil sheet.

Preferably, the protective shell is an insulating plastic shell.

Preferably, the protective shell is a soft insulating sealing bag.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, a capacitance structure is formed between the conducting strip and the natural atmosphere, the liquid level change in the container can enable the capacitance loop to vibrate, and the vibration frequency change is calculated and analyzed through the singlechip processor, so that the real-time state of the liquid level is identified, the sensitivity is high, and the manufacturing cost of the sensor is low.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of the application of the present utility model.

In the figure: 1, a conductive sheet; 2, conducting wires; 3, a singlechip processor; 4, protecting a shell; 5 a container; 6 the liquid level inside the container.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-2, a low-cost high-sensitivity capacitive sensor comprises a protective shell 4, wherein a flat sealing cavity is formed in the protective shell 4, a conducting sheet 1 is paved on an extending surface in the flat sealing cavity, the conducting sheet 1 is a round thin sheet, a copper foil sheet can be selected as the conducting sheet 1, and the conducting sheet 1 is electrically communicated with a singlechip processor 3 through a lead 2.

The protective shell 4 is an insulating plastic shell or a soft insulating sealing bag. When the liquid level sensor is applied, the sensor protection shell 4 is partially fixed on the inner wall surface of the container and is positioned in the liquid level warning line area, the copper foil sheets and the natural atmosphere are conductors, liquid contained in the container 5 is equivalent to insulating media in the capacitor structure, when the liquid level 6 in the container rises or falls in the process of passing through the area where the copper foil sheets are positioned, the copper foil sheets vibrate in a loop between the singlechip processor 3 and the capacitor structure due to the fact that the areas covered by the liquid level are different, the singlechip processor 3 calculates and analyzes the vibration frequency change, the real-time state of the liquid level can be identified, the conducting sheet 1 is arranged into a circular thin sheet, and the trend of liquid level rising or falling can be accurately identified through the characteristic that the upper end and the lower end of the circular thin sheet linearly shrink.

To sum up: according to the utility model, a capacitance structure is formed between the conducting strip 1 and the natural atmosphere, the liquid level change in the container 5 can cause the capacitance loop to vibrate, and the vibration frequency change is calculated and analyzed through the singlechip processor 3, so that the real-time state of the liquid level is identified, the sensitivity is high, and the manufacturing cost of the sensor is low.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (5)

1. A low-cost high-sensitivity capacitive sensor comprising a protective housing (4), characterized in that: the protection shell (4) is internally provided with a flat sealing cavity, a conducting sheet (1) is paved on an extension surface in the flat sealing cavity, and the conducting sheet (1) is electrically communicated with the singlechip processor (3) through a lead (2).

2. A low cost, high sensitivity capacitive sensor according to claim 1, wherein: the conductive sheet (1) is a circular thin sheet.

3. A low cost, high sensitivity capacitive sensor according to claim 1 or 2, characterized in that: the conducting sheet (1) is a copper foil sheet.

4. A low cost, high sensitivity capacitive sensor according to claim 1, wherein: the protective shell (4) is an insulating plastic shell.

5. A low cost, high sensitivity capacitive sensor according to claim 1, wherein: the protective shell (4) is a soft insulating sealing bag.