CN210982306U

CN210982306U - Capacitive rainwater sensor

Info

Publication number: CN210982306U
Application number: CN201921565049.6U
Authority: CN
Inventors: 龙林
Original assignee: Yiyang Yixuan Electronic Technology Co ltd
Current assignee: Yiyang Yixuan Electronic Technology Co ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-07-10
Anticipated expiration: 2029-09-19

Abstract

The utility model provides a capacitance type rain sensor, belonging to the sensor field, comprising an insulating layer, a first electrode and a second electrode which are arranged on the inner wall of the insulating layer and are mutually separated, and a capacitance measuring unit which is respectively and electrically connected with the first electrode and the second electrode; the outer wall of the insulating layer is a surface in contact with raindrops. The insulating layer is made of an anti-corrosion material. Compared with the prior art, the utility model has simple structure, under the action of the insulating layer, the first electrode and the second electrode are not in direct contact with rainwater, thereby avoiding the electrodes from being corroded by rainwater, and being safe and reliable; and the state of whether the rain falls or not and the sensed rainfall can be updated in time.

Description

Capacitive rainwater sensor

Technical Field

The utility model relates to a sensor technical field specifically indicates a capacitanc rain sensor for testing rainfall.

Background

In order to guide agricultural production and detect whether the rain falls and the rainfall amount, a rain sensor is needed; the existing rain sensor adopts a resistance contact mode, has a simple principle and is easily corroded by rain; or adopt the photoelectricity way, for example the car, but need wiper blade to renew the rainy state in time, there is the inconvenience in using.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a simple structure, safe and reliable's capacitanc rain sensor.

In order to achieve the above object, the utility model adopts the following technical scheme: a capacitance type rain sensor comprises an insulating layer, a first electrode, a second electrode and a capacitance measuring unit, wherein the first electrode and the second electrode are arranged on the inner wall of the insulating layer and are mutually separated; the outer wall of the insulating layer is a surface in contact with raindrops. The insulating layer is made of an anti-corrosion material. The first electrode and the second electrode form a capacitor, and the capacitance measuring unit can measure the capacitance between the first electrode and the second electrode. According to the calculation formula of the capacitance: "C ═ S/4 pi kd ═ S/d"; the dielectric permittivity and the capacitance C are respectively a dielectric permittivity and a capacitance, when raining, the dielectric permittivity between two poles of the first electrode and the second electrode is increased due to the conductive effect of rainwater, and the capacitance C of a capacitor formed by the first electrode and the second electrode is correspondingly increased under the condition that other parameters are not changed; and the larger the rain is, the larger the capacitance between the two electrodes is; by measuring the capacitance between the first electrode and the second electrode by the capacitance measuring unit, it is possible to know whether it is raining at present and the intensity of the raining.

The beneficial technical effects are as follows: compared with the prior art, the utility model has simple structure, under the action of the insulating layer, the first electrode and the second electrode are not in direct contact with rainwater, thereby avoiding the electrodes from being corroded by rainwater, and being safe and reliable; and the state of whether the rain falls or not and the sensed rainfall can be updated in time.

Drawings

Fig. 1 is a schematic view of the present invention.

Detailed Description

In order to make the technical field better understand the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and embodiments.

As shown in fig. 1, a capacitive rain sensor includes an insulating layer 1, a first electrode 2 and a second electrode 3 disposed on an inner wall of the insulating layer and spaced apart from each other, and a capacitance measuring unit 4 electrically connected to the first electrode 2 and the second electrode 3, respectively; the outer wall of the insulating layer 1 is a surface in contact with the raindrops 5. The insulating layer 1 is made of an anti-corrosion material. The first electrode 2 and the second electrode 3 constitute a capacitor, and the capacitance measuring unit can measure the capacitance between the first electrode and the second electrode.

According to the calculation formula of the capacitance: "C ═ S/4 pi kd ═ S/d"; the dielectric permittivity and the capacitance C are respectively a dielectric permittivity and a capacitance, when raining, the dielectric permittivity between the two electrodes of the first electrode 2 and the second electrode 3 is increased due to the conductive effect of rainwater, and the capacitance C of the capacitor formed by the first electrode 2 and the second electrode 3 is correspondingly increased under the condition that other parameters are not changed; and the larger the rain is, the larger the capacitance between the two electrodes is; by measuring the capacitance between the first electrode 2 and the second electrode 3 by the capacitance measuring unit 4, it is possible to know whether it is raining at present and the intensity of the raining.

Compared with the prior art, the utility model has simple structure, under the action of the insulating layer 1, the first electrode 2 and the second electrode 3 are not in direct contact with rainwater, thereby avoiding the electrodes from being corroded by rainwater, and being safe and reliable; and the state of whether the rain falls or not and the sensed rainfall can be updated in time.

In the above description, it should be noted that the terms "mounted," "connected," and "connected" are used in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection may be direct or indirect via an intermediate medium, and the connection may be internal to the two components.

Although the present invention has been described in terms of embodiments, those skilled in the art will recognize that there are numerous variations and modifications of the present invention without departing from the spirit of the invention, and it is intended that the appended claims encompass such variations and modifications without departing from the spirit of the invention.

Claims

1. A capacitance type rain sensor is characterized by comprising an insulating layer, a first electrode, a second electrode and a capacitance measuring unit, wherein the first electrode and the second electrode are arranged on the inner wall of the insulating layer and are mutually separated; the outer wall of the insulating layer is a surface in contact with raindrops.